Grizzly G0720R Owner's manual

Brand: Grizzly

Model: G0720R

Type: Owner's manual

MODEL G0720R

HEAVY-DUTY BENCHTOP

MILLING MACHINE

OWNER'S MANUAL

WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE

OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.

(FOR MODELS MANUFACTURED SINCE 11/10) #CR13495 PRINTED IN CHINA

This manual provides critical safety instructions on the proper setup,

operation, maintenance, and service of this machine/tool. Save this

document, refer to it often, and use it to instruct other operators.

Failure to read, understand and follow the instructions in this manual

may result in fire or serious personal injury—including amputation,

electrocution, or death.

The owner of this machine/tool is solely responsible for its safe use.

This responsibility includes but is not limited to proper installation in

a safe environment, personnel training and usage authorization,

proper inspection and maintenance, manual availability and compre-

hension, application of safety devices, cutting/sanding/grinding tool

integrity, and the usage of personal protective equipment.

The manufacturer will not be held liable for injury or property damage

from negligence, improper training, machine modifications or misuse.

Some dust created by power sanding, sawing, grinding, drilling, and

other construction activities contains chemicals known to the State

of California to cause cancer, birth defects or other reproductive

harm. Some examples of these chemicals are:

• Lead from lead-based paints.

• Crystalline silica from bricks, cement and other masonry products.

• Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you

do this type of work. To reduce your exposure to these chemicals:

Work in a well ventilated area, and work with approved safety equip-

ment, such as those dust masks that are specially designed to filter

out microscopic particles.

Table of Contents

INTRODUCTION ............................................... 2

Manual Accuracy ........................................... 2

Contact Info.................................................... 2

Machine Description ...................................... 2

Identification ................................................... 3

SECTION 1: SAFETY ....................................... 6

Safety Instructions for Machinery .................. 6

Additional Safety for Mills .............................. 8

SECTION 2: POWER SUPPLY ........................ 9

Availability .................................................... 9

Full-Load Current Rating ............................. 9

Circuit Requirements ................................... 9

Grounding & Plug Requirements ............... 10

Extension Cords ........................................ 10

SECTION 3: SETUP ....................................... 11

Needed for Setup ......................................... 11

Unpacking .................................................... 11

Inventory ...................................................... 12

Cleanup ........................................................ 13

Site Considerations ...................................... 14

Mounting to Workbench ............................... 15

Test Run ...................................................... 15

Spindle Break-In .......................................... 17

SECTION 4: OPERATIONS ........................... 18

Operation Overview ..................................... 18

Controls ........................................................ 19

Digital Spindle Height Gauge ................... 20

Mini Digital Protractor ............................... 20

Selecting Spindle RPM ................................ 21

Setting Spindle Height ................................. 21

Drill Chuck Installation & Removal .............. 22

Installation ................................................. 22

Removal .................................................... 22

R-8 Collet Installation & Removal ................ 23

Installation ................................................. 23

Removal .................................................... 23

Headstock Travel (Z-Axis & Rotation) ......... 24

Raising & Lowering ................................... 24

Tilting ......................................................... 25

Table Travel (X-Axis & Y-Axis) ................... 26

X-Axis ........................................................ 26

Y-Axis ........................................................ 26

Milling/Drilling Mode ..................................... 27

Tapping Mode .............................................. 27

SECTION 5: ACCESSORIES ......................... 28

SECTION 6: MAINTENANCE ......................... 30

Schedule ...................................................... 30

Ongoing ..................................................... 30

Daily, Before Operations ........................... 30

Daily, After Operations .............................. 30

Monthly ...................................................... 30

Annually ..................................................... 30

Lubrication ................................................... 30

Ball Oilers .................................................. 31

Leadscrews ............................................... 32

Battery Replacement ................................... 33

Digital Spindle Height Gauge .................... 33

Mini Digital Protractor ................................ 33

SECTION 7: SERVICE ................................... 34

Troubleshooting ........................................... 34

Gib Adjustment ............................................ 35

Table Gib Adjustment ................................ 35

Headstock Gib Adjustment ........................ 36

Machine Storage .......................................... 36

SECTION 8: WIRING ...................................... 37

Wiring Safety Instructions ............................ 37

Wiring Overview ........................................... 38

Wiring Diagram ............................................ 39

Wiring Diagram ............................................ 40

Electrical Components ................................. 41

SECTION 9: PARTS ....................................... 43

Head Breakdown ......................................... 43

Column Breakdown...................................... 46

Table Breakdown ......................................... 48

Label Placement .......................................... 50

WARRANTY AND RETURNS ........................ 53

-2-

Model G0720R (Mfg. Since 11/10)

INTRODUCTION

The Model G0720R Heavy-Duty Benchtop Mill

removes material from workpieces to form com-

plex shapes. The headstock can be held station-

ary at various angles while the spindle rotates the

cutter. The operator then has the option to use the

coarse or fine feed controls to move the spindle

and cutter into the workpiece which is clamped

to the table. The operator also has the option to

move the table and workpiece into the cutter by

the use of the table handwheels.

Cutting speeds are adjustable through the use of

a spindle speed dial located on the control panel,

where a digital tachometer is also located.

The mill has a tapping feature where when in the

tapping mode, the spindle immediately reverses

rotation when any of the buttons located at the

end of the downfeed handles are pushed. This is

an important feature for tap removal.

Machine Description

We stand behind our machines! If you have ques-

tions or need help, contact us with the information

below. Before contacting, make sure you get the

serial number

and manufacture date

from the

machine ID label. This will help us help you faster.

Grizzly Technical Support

1815 W. Battlefield

Springfield, MO 65807

Phone: (570) 546-9663

Email: [email protected]

We want your feedback on this manual. What did

you like about it? Where could it be improved?

Please take a few minutes to give us feedback.

Grizzly Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Email: [email protected]

Contact Info

We are proud to provide a high-quality owner’s

manual with your new machine!

made every effort to be exact with the

instruc-

tions, specifications, drawings, and photographs

in this manual. Sometimes we make mistakes, but

our policy of continuous improvement also means

that

sometimes the machine

you receive is

slightly different than shown in the manual

If you find this to be the case, and the difference

between the manual and machine leaves you

confused or unsure about something

check our

website for an updated version. W

e post

current

manuals and

manual updates for free

on our web-

site at

www.grizzly.com.

Alternatively, you can call our Technical Support

for help. Before calling, make sure you write down

the

Manufacture Date and Serial Number

from

the machine ID label (see below). This information

is required for us to provide proper tech support,

and it helps us determine if updated documenta-

tion is available for your machine.

Manufacture Date

Serial Number

Manual Accuracy

Model G0720R (Mfg. Since 11/10)

-3-

Identification

Figure 1. G0720R Identification.

A. Safety Cover and Drawbar

B. Fine Feed Knob

C. Mini Digital Protractor

D. Main Power Switch

E. Fine Feed Lock Knob w/Assist Lever

F. Downfeed Handle

G. Precision Dovetailed Column

H. Longitudinal (X-Axis) Handwheel

I. Cast-Iron Base

J. Base Mounting Boss

K. Cross (Y-Axis) Handwheel

L. Precision Dovetailed Table Ways

M. Table Locks

N. Longitudinal Scale

O. Milling Table

P. Spindle Rotation Button

Q. Drill Chuck

R. Quill Lock Lever

S. Polycarbonate Chip Guard w/Magnetic Lock

T. Digital Spindle Depth Scale

U. Emergency Stop Button

V. Headstock Power UP and DOWN Buttons

W. Spindle Speed Dial and RPM Display

X. Power Light

Y. Tapping and Milling Mode Switch

Z. Start Button

-4-

Model G0720R (Mfg. Since 11/10)

The information contained herein is deemed accurate as of 5/16/2018 and represents our most recent product specifications.

Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased.

PAGE 1 OF 3

Model G0720R

MACHINE DATA

SHEET

Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901

MODEL G0720R HEAVY‐DUTY BENCH TOP MILLING

MACHINE

Product Dimensions:

Weight.............................................................................................................................................................. 596 lbs.

Width (side-to-side) x Depth (front-to-back) x Height............................................................... 14-1/2 x 30-1/2 x 43 in.

Footprint (Length x Width)............................................................................................................... 28-1/2 x 14-1/2 in.

Space Required for Full Range of Movement (Width x Depth).............................................................. 55-3/4 x 33 in.

Shipping Dimensions:

Type.......................................................................................................................................................... Wood Crate

Content........................................................................................................................................................... Machine

Weight.............................................................................................................................................................. 768 lbs.

Length x Width x Height....................................................................................................................... 41 x 52 x 36 in.

Electrical:

Power Requirement........................................................................................................... 110V, Single-Phase, 60 Hz

Prewired Voltage.................................................................................................................................................. 110V

Full-Load Current Rating................................................................................................................................... 11.12A

Minimum Circuit Size.............................................................................................................................................. 20A

Connection Type....................................................................................................................................... Cord & Plug

Power Cord Included.............................................................................................................................................. Yes

Power Cord Length................................................................................................................................................. 8 ft.

Power Cord Gauge......................................................................................................................................... 14 AWG

Plug Included.......................................................................................................................................................... Yes

Included Plug Type................................................................................................................................................ 5-15

Switch Type........................................................................................................ Forward/Reverse & Button Switches

Motors:

Main

Horsepower................................................................................................................................................ 2 HP

Amps............................................................................................................................................................ 10A

Speed.......................................................................................................................................... 0 – 3600 RPM

Type.............................................................................................................................. Brushless DC (Class F)

Power Transfer .................................................................................................................................. Belt Drive

Bearings..................................................................................................... Shielded & Permanently Lubricated

Centrifugal Switch/Contacts Type................................................................................................................ N/A

Head Elevation

Horsepower........................................................................................................................................... 1/12 HP

Phase............................................................................................................................................ Single-Phase

Amps......................................................................................................................................................... 1.12A

Speed..................................................................................................................................... 1400 / 1700 RPM

Type................................................................................................................. TEFC Capacitor-Start Induction

Power Transfer ............................................................................................................................... Direct Drive

Bearings..................................................................................................... Shielded & Permanently Lubricated

Centrifugal Switch/Contacts Type................................................................................................................ N/A

Model G0720R (Mfg. Since 11/10)

-5-

The information contained herein is deemed accurate as of 5/16/2018 and represents our most recent product specifications.

Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased.

PAGE 2 OF 3

Model G0720R

Main Specifications:

Operation Info

Spindle Travel...................................................................................................................................... 3-5/16 in.

Max Distance Spindle to Column........................................................................................................ 11-3/8 in.

Max Distance Spindle to Table............................................................................................................ 15-3/4 in.

Longitudinal Table Travel (X-Axis)...................................................................................................... 17-5/8 in.

Cross Table Travel (Y-Axis).................................................................................................................. 9-5/8 in.

Vertical Head Travel (Z-Axis).............................................................................................................. 13-1/8 in.

Head Tilt (Left/Right).............................................................................................................................. 45 deg.

Drilling Capacity for Cast Iron................................................................................................................ 1-1/8 in.

Drilling Capacity for Steel............................................................................................................................ 1 in.

Tapping Speed............................................................................................................................ 50 – 800 RPM

End Milling Capacity.................................................................................................................................... 1 in.

Face Milling Capacity............................................................................................................................ 2-1/2 in.

Table Info

Table Length........................................................................................................................................ 32-1/4 in.

Table Width........................................................................................................................................... 9-1/2 in.

Table Thickness.................................................................................................................................... 2-5/8 in.

Number of T-Slots............................................................................................................................................ 4

T-Slot Size.............................................................................................................................................. 9/16 in.

T-Slots Centers...................................................................................................................................... 2-1/8 in.

X/Y-Axis Travel per Handwheel Revolution.......................................................................................... 0.125 in.

Spindle Info

Spindle Taper............................................................................................................................................... R-8

Number of Vertical Spindle Speeds...................................................................................................... Variable

Range of Vertical Spindle Speeds........................................................................................... 100 – 1600 RPM

Quill Diameter......................................................................................................................................... 2.56 in.

Drawbar Thread Size............................................................................................................................. 7/16-20

Drawbar Length................................................................................................................................... 13-1/2 in.

Spindle Bearings......................................................................................................... Tapered Roller Bearings

Construction

Spindle Housing/Quill........................................................................................................................... Cast Iron

Table....................................................................................................................................... Ground Cast Iron

Head.................................................................................................................................................... Cast Iron

Column/Base....................................................................................................................................... Cast Iron

Base..................................................................................................................................................... Cast Iron

Paint Type/Finish.................................................................................................................................... Enamel

Other Specifications:

Country of Origin ................................................................................................................................................ China

Warranty ........................................................................................................................................................... 1 Year

Approximate Assembly & Setup Time ........................................................................................................ 30 Minutes

Serial Number Location ........................................................................................................... ID Label on Headstock

ISO 9001 Factory .................................................................................................................................................. Yes

Certified by a Nationally Recognized Testing Laboratory (NRTL) .......................................................................... No

-6-

Model G0720R (Mfg. Since 11/10)

ELECTRICAL EQUIPMENT INJURY RISKS. You

can be shocked, burned, or killed by touching live

electrical components or improperly grounded

machinery. To reduce this risk, only allow qualified

service personnel to do electrical installation or

repair work, and always disconnect power before

accessing or exposing electrical equipment.

DISCONNECT POWER FIRST.

Always discon-

nect machine from power supply BEFORE making

adjustments, changing tooling, or servicing machine.

This prevents an injury risk from unintended startup

or contact with live electrical components.

EYE PROTECTION. Always wear ANSI-approved

safety glasses or a face shield when operating or

observing machinery to reduce the risk of eye

injury or blindness from flying particles. Everyday

eyeglasses are NOT approved safety glasses.

OWNER’S MANUAL. Read and understand this

owner’s manual BEFORE using machine.

TRAINED OPERATORS ONLY. Untrained oper-

ators have a higher risk of being hurt or killed.

Only allow trained/supervised people to use this

machine. When machine is not being used, dis-

connect power, remove switch keys, or lock-out

machine to prevent unauthorized use—especially

around children. Make your workshop kid proof!

DANGEROUS ENVIRONMENTS. Do not use

machinery in areas that are wet, cluttered, or have

poor lighting. Operating machinery in these areas

greatly increases the risk of accidents and injury.

MENTAL ALERTNESS REQUIRED. Full mental

alertness is required for safe operation of machin-

ery. Never operate under the influence of drugs or

alcohol, when tired, or when distracted.

For Your Own Safety, Read Instruction

Manual Before Operating This Machine

The purpose of safety symbols is to attract your attention to possible hazardous conditions.

This manual uses a series of symbols and signal words intended to convey the level of impor-

tance of the safety messages. The progression of symbols is described below. Remember that

safety messages by themselves do not eliminate danger and are not a substitute for proper

accident prevention measures. Always use common sense and good judgment.

Indicates a potentially hazardous situation which, if not avoided,

MAY result in minor or moderate injury. It may also be used to alert

against unsafe practices.

Indicates a potentially hazardous situation which, if not avoided,

COULD result in death or serious injury.

Indicates an imminently hazardous situation which, if not avoided,

WILL result in death or serious injury.

This symbol is used to alert the user to useful information about

proper operation of the machine.

NOTICE

Safety Instructions for Machinery

SECTION 1: SAFETY

Model G0720R (Mfg. Since 11/10)

-7-

WEARING PROPER APPAREL. Do not wear

clothing, apparel or jewelry that can become

entangled in moving parts. Always tie back or

cover long hair. Wear non-slip footwear to reduce

risk of slipping and losing control or accidentally

contacting cutting tool or moving parts.

HAZARDOUS DUST. Dust created by machinery

operations may cause cancer, birth defects, or

long-term respiratory damage. Be aware of dust

hazards associated with each workpiece mate-

rial. Always wear a NIOSH-approved respirator to

reduce your risk.

HEARING PROTECTION. Always wear hear-

ing protection when operating or observing loud

machinery. Extended exposure to this noise

without hearing protection can cause permanent

hearing loss.

REMOVE ADJUSTING TOOLS. Tools left on

machinery can become dangerous projectiles

upon startup. Never leave chuck keys, wrenches,

or any other tools on machine. Always verify

removal before starting!

USE CORRECT TOOL FOR THE JOB. Only use

this tool for its intended purpose—do not force

it or an attachment to do a job for which it was

not designed. Never make unapproved modifica-

tions—modifying tool or using it differently than

intended may result in malfunction or mechanical

failure that can lead to personal injury or death!

AWKWARD POSITIONS. Keep proper footing

and balance at all times when operating machine.

Do not overreach! Avoid awkward hand positions

that make workpiece control difficult or increase

the risk of accidental injury.

CHILDREN & BYSTANDERS. Keep children and

bystanders at a safe distance from the work area.

Stop using machine if they become a distraction.

GUARDS & COVERS. Guards and covers reduce

accidental contact with moving parts or flying

debris. Make sure they are properly installed,

undamaged, and working correctly BEFORE

operating machine.

FORCING MACHINERY. Do not force machine.

It will do the job safer and better at the rate for

which it was designed.

NEVER STAND ON MACHINE. Serious injury

may occur if machine is tipped or if the cutting

tool is unintentionally contacted.

STABLE MACHINE. Unexpected movement dur-

ing operation greatly increases risk of injury or

loss of control. Before starting, verify machine is

stable and mobile base (if used) is locked.

USE RECOMMENDED ACCESSORIES. Consult

this owner’s manual or the manufacturer for rec-

ommended accessories. Using improper acces-

sories will increase the risk of serious injury.

UNATTENDED OPERATION. To reduce the

risk of accidental injury, turn machine OFF and

ensure all moving parts completely stop before

walking away. Never leave machine running

while unattended.

MAINTAIN WITH CARE. Follow all maintenance

instructions and lubrication schedules to keep

machine in good working condition. A machine

that is improperly maintained could malfunction,

leading to serious personal injury or death.

DAMAGED PARTS. Regularly inspect machine

for damaged, loose, or mis-adjusted parts—or

any condition that could affect safe operation.

Immediately repair/replace BEFORE operating

machine. For your own safety, DO NOT operate

machine with damaged parts!

MAINTAIN POWER CORDS. When disconnect-

ing cord-connected machines from power, grab

and pull the plug—NOT the cord. Pulling the cord

may damage the wires inside. Do not handle

cord/plug with wet hands. Avoid cord damage by

keeping it away from heated surfaces, high traffic

areas, harsh chemicals, and wet/damp locations.

EXPERIENCING DIFFICULTIES. If at any time

you experience difficulties performing the intend-

ed operation, stop using the machine! Contact our

Technical Support at (570) 546-9663.

-8-

Model G0720R (Mfg. Since 11/10)

Additional Safety for Mills

MACHINE CARE AND MAINTENANCE.

Never operate the mill with damaged or worn

parts. Maintain your mill in proper working con-

dition. Perform routine inspections and mainte-

nance promptly. Put away adjustment tools after

use.

DISCONNECT POWER. Make sure the mill is

turned OFF, disconnected from its power source

and all moving parts have come to a complete

stop before starting any inspection, adjustment,

or maintenance procedure.

AVOIDING ENTANGLEMENT. Keep loose

clothing articles such as sleeves, belts or jewelry

items away from the mill spindle. Never wear

gloves when operating the mill.

BE ATTENTIVE. DO NOT leave mill running

unattended for any reason.

TOOL HOLDING. Always use the proper tools

for the material you are milling. Make sure they

are held firmly in the proper tool holder for the

job.

CLE AN - UP. DO NOT clear chips by hand. Use

a brush, and never clear chips while the mill is

turning.

EXPERIENCING DIFFICULTIES. If at any time

you are experiencing difficulties performing the

intended operation, stop using the machine!

Contact our Technical Support at (570) 546-

9663.

UNDERSTANDING CONTROLS. Make sure you

understand the use and operation of all controls.

SAFETY ACCESSORIES. Always use a chip

guard in addition to your safety goggles when

milling to prevent bodily injury.

WORK HOLDING. Before starting the machine,

be certain the workpiece has been properly

clamped to the table. NEVER hold the workpiece

by hand when using the mill.

CHUCK KEY SAFETY. Always remove your

chuck key, drawbar wrench, and any service tools

immediately after use.

SPINDLE SPEEDS. Select the spindle speed

that is appropriate for the type of work and mate-

rial. Allow the mill to gain full speed before begin-

ning a cut.

POWER DISRUPTION. In the event of a local

power outage during use of the mill, turn OFF all

switches to avoid possible sudden start up once

power is restored.

STOPPING SPINDLE. DO NOT stop the mill

using your hand against the chuck.

CUTTING TOOL INSPECTION. Inspect drills and

end mills for sharpness, chips, or cracks before

each use. Replace dull, chipped, or cracked cut-

ting tools immediately. Handle new cutting tools

with care. Leading edges are very sharp and can

cause lacerations.

No list of safety guidelines can be complete.

Every shop environment is different. Always

consider safety first, as it applies to your

individual working conditions. Use this and

other machinery with caution and respect.

Failure to do so could result in serious per-

sonal injury, damage to equipment, or poor

work results.

Like all machinery there is potential danger

when operating this machine. Accidents are

frequently caused by lack of familiarity or

failure to pay attention. Use this machine

with respect and caution to decrease the

risk of operator injury. If normal safety pre-

cautions are overlooked or ignored, serious

personal injury may occur.

Model G0720R (Mfg. Since 11/10)

-9-

SECTION 2: POWER SUPPLY

Availability

Before installing the machine, consider the avail-

ability and proximity of the required power supply

circuit. If an existing circuit does not meet the

requirements for this machine, a new circuit must

be installed. To minimize the risk of electrocution,

fire, or equipment damage, installation work and

electrical wiring must be done by an electrician or

qualified service personnel in accordance with all

applicable codes and standards.

Electrocution, fire, shock,

or equipment damage

may occur if machine is

not properly grounded

and connected to power

supply.

Full-Load Current Rating

The full-load current rating is the amperage a

machine draws at 100% of the rated output power.

On machines with multiple motors, this is the

amperage drawn by the largest motor or sum of all

motors and electrical devices that might operate

at one time during normal operations.

Full-Load Current Rating at 110V ...... 16 Amps

The full-load current is not the maximum amount

of amps that the machine will draw. If the machine

is overloaded, it will draw additional amps beyond

the full-load rating.

If the machine is overloaded for a sufficient length

of time, damage, overheating, or fire may result—

especially if connected to an undersized circuit.

To reduce the risk of these hazards, avoid over-

loading the machine during operation and make

sure it is connected to a power supply circuit that

meets the specified circuit requirements.

Circuit Requirements

This machine is prewired to operate on a power

supply circuit that has a verified ground and meets

the following requirements:

Nominal Voltage ...............................110V/120V

Cycle ..........................................................60 Hz

Phase ........................................... Single-Phase

Minimum Circuit Size ......................... 20 Amps

For your own safety and protection of

property, consult an electrician if you are

unsure about wiring practices or electrical

codes in your area.

Note: Circuit requirements in this manual apply to

a dedicated circuit—where only one machine will

be running on the circuit at a time. If machine will

be connected to a shared circuit where multiple

machines may be running at the same time, con-

sult an electrician or qualified service personnel to

ensure circuit is properly sized for safe operation.

A power supply circuit includes all electrical

equipment between the breaker box or fuse panel

in the building and the machine. The power sup-

ply circuit used for this machine must be sized to

safely handle the full-load current drawn from the

machine for an extended period of time. (If this

machine is connected to a circuit protected by

fuses, use a time delay fuse marked D.)

-10-

Model G0720R (Mfg. Since 11/10)

Improper connection of the equipment-grounding

wire can result in a risk of electric shock. The

wire with green insulation (with or without yellow

stripes) is the equipment-grounding wire. If repair

or replacement of the power cord or plug is nec-

essary, do not connect the equipment-grounding

wire to a live (current carrying) terminal.

Check with a qualified electrician or service per-

sonnel if you do not understand these grounding

requirements, or if you are in doubt about whether

the tool is properly grounded. If you ever notice

that a cord or plug is damaged or worn, discon-

nect it from power, and immediately replace it with

a new one.

Extension Cords

We do not recommend using an extension cord

with this machine.

If you must use an extension

cord, only use it if absolutely necessary and only

on a temporary basis.

Extension cords cause voltage drop, which can

damage electrical components and shorten motor

life. Voltage drop increases as the extension cord

size gets longer and the gauge size gets smaller

(higher gauge numbers indicate smaller sizes).

Any extension cord used with this machine must

be in good condition and contain a ground wire

and matching plug/receptacle. Additionally, it must

meet the following size requirements:

Minimum Gauge Size ...........................12 AWG

Maximum Length (Shorter is Better).......50 ft.

Figure 2. Typical 5-15 plug and receptacle.

Grounding Prong

Neutral Hot

5-15 PLUG

GROUNDED

5-15 RECEPTACLE

SHOCK HAZARD!

Two-prong outlets do not meet the grounding

requirements for this machine. Do not modify

or use an adapter on the plug provided—if

it will not fit the outlet, have a qualified

electrician install the proper outlet with a

verified ground.

Grounding & Plug Requirements

Serious injury could occur if you connect

machine to power before completing setup

process. DO NOT connect to power until

instructed later in this manual.

The full-load current is not the maximum amount

of amps that the machine will draw. If the machine

is overloaded, it will draw additional amps beyond

the full-load rating.

If the machine is overloaded for a sufficient length

of time, damage, overheating, or fire may result—

especially if connected to an undersized circuit.

To reduce the risk of these hazards, avoid over-

loading the machine during operation and make

sure it is connected to a power supply circuit that

meets the specified circuit requirements.

This machine is equipped with a power cord that

has an equipment-grounding wire and a grounding

plug. Only insert plug into a matching receptacle

(outlet) that is properly installed and grounded in

accordance with all local codes and ordinances.

DO NOT modify the provided plug!

Model G0720R (Mfg. Since 11/10)

-11-

Wear safety goggles dur-

ing the entire setup pro-

cess!

This machine presents

serious injury hazards

to untrained users. Read

through this entire manu-

al to become familiar with

the controls and opera-

tions before starting the

machine!

SECTION 3: SETUP

Needed for Setup

This machine and its com-

ponents are very heavy.

Get lifting help or use

power lifting equipment

such as a forklift to move

heavy items.

Your machine was carefully packaged for safe

transportation. Remove the packaging materials

from around your machine and inspect it. If you

discover the machine is damaged, please imme-

diately call Customer Service at (570) 546-9663

for advice.

Save the containers and all packing materials for

possible inspection by the carrier or its agent.

Otherwise, filing a freight claim can be difficult.

When you are completely satisfied with the condi-

tion of your shipment, inventory the contents.

Unpacking

SUFFOCATION HAZARD!

Keep children and pets away

from plastic bags or packing

materials shipped with this

machine. Discard immediately.

The following are needed to complete the setup

process, but are not included with your machine.

Description Qty

• An Assistant ............................................... 1

• Precision Level ........................................... 1

• Safety Glasses ....................................2-Pair

• Mineral Spirits ...................................1-Quart

• Shop Rags .................................................. 5

• Lifting Straps (1500lb Min. Capacity) ......... 2

• Forklift or Hoisting Apparatus (1500lb

Minimum Capacity) ..................................... 1

-12-

Model G0720R (Mfg. Since 11/10)

Figure 4. Inventory.

Figure 3. G0720R out of the crate.

Inventory

The following is a list of items shipped with your

machine. Before beginning setup, lay these items

out and inventory them.

If any non-proprietary parts are missing (e.g. a

nut or a washer), we will gladly replace them; or

for the sake of expediency, replacements can be

obtained at your local hardware store.

NOTICE

If you cannot find an item on this list, care-

fully check around/inside the machine and

packaging materials. Often, these items get

lost in packaging materials while unpack-

ing or they are pre-installed at the factory.

Box 1: (Figures 3 & 4) Qty

A. Assembled Mill ........................................... 1

B. Drill Chuck .................................................. 1

C. Open End Wrench 8/10mm ........................ 1

D. Open End Wrench 14/17mm ...................... 1

E. Open End Wrench 19/22mm ...................... 1

F. Spindle Lock Pin ........................................ 1

G. Chuck Key .................................................. 1

H. Fuse 1 Amp, Fast-Blow 5 x 20mm ............. 1

I. Fuse 2 Amp, Fast-Blow 5 x 20mm ............. 1

J. Hex Wrench Set 4, 5, 6, & 12mm ..........1 Ea

K. Bottle for Oil ............................................... 1

Model G0720R (Mfg. Since 11/10)

-13-

The unpainted surfaces of your machine are

coated with a heavy-duty rust preventative that

prevents corrosion during shipment and storage.

This rust preventative works extremely well, but it

will take a little time to clean.

Be patient and do a thorough job cleaning your

machine. The time you spend doing this now will

give you a better appreciation for the proper care

of your machine's unpainted surfaces.

There are many ways to remove this rust preven-

tative, but the following steps work well in a wide

variety of situations. Always follow the manufac-

turer’s instructions with any cleaning product you

use and make sure you work in a well-ventilated

area to minimize exposure to toxic fumes.

Before cleaning, gather the following:

• Disposable rags

• Cleaner/degreaser (WD•40 works well)

• Safety glasses & disposable gloves

• Plastic paint scraper (optional)

Basic steps for removing rust preventative:

Put on safety glasses.

Coat the rust preventative with a liberal

amount of cleaner/degreaser, then let it soak

for 5–10 minutes.

Wipe off the surfaces. If your cleaner/degreas-

er is effective, the rust preventative will wipe

off easily. If you have a plastic paint scraper,

scrape off as much as you can first, then wipe

off the rest with the rag.

Repeat Steps 2–3 as necessary until clean,

then coat all unpainted surfaces with a quality

metal protectant to prevent rust.

Gasoline and petroleum

products have low flash

points and can explode

or cause fire if used to

clean machinery. Avo id

using these products

to clean machinery.

Many cleaning solvents

are toxic if inhaled. Only

work in a well-ventilated

area.

NOTICE

Avoid chlorine-based solvents, such as

acetone or brake parts cleaner, that may

damage painted surfaces.

Cleanup

-14-

Model G0720R (Mfg. Since 11/10)

Site Considerations

Figure 6. Minimum working clearances.

Weight Load

Refer to the

Machine Data Sheet for the weight

of your machine. Make sure that the surface upon

which the machine is placed will bear the weight

of the machine, additional equipment that may be

installed on the machine, and the heaviest work-

piece that will be used. Additionally, consider the

weight of the operator and any dynamic loading

that may occur when operating the machine.

Space Allocation

Consider the largest size of workpiece that will

be processed through this machine and provide

enough space around the machine for adequate

operator material handling or the installation of

auxiliary equipment. With permanent installations,

leave enough space around the machine to open

or remove doors/covers as required by the main-

tenance and service described in this manual.

See below for required space allocation.

Physical Environment

The physical environment where the machine is

operated is important for safe operation and lon-

gevity of machine components. For best results,

operate this machine in a dry environment that is

free from excessive moisture, hazardous chemi-

cals, airborne abrasives, or extreme conditions.

Extreme conditions for this type of machinery are

generally those where the ambient temperature

range exceeds 41°–104°F; the relative humidity

range exceeds 20%–95% (non-condensing); or

the environment is subject to vibration, shocks,

or bumps.

Electrical Installation

Place this machine near an existing power source.

Make sure all power cords are protected from

traffic, material handling, moisture, chemicals, or

other hazards. Make sure to leave enough space

around machine to disconnect power supply or

apply a lockout/tagout device, if required.

Lighting

Lighting around the machine must be adequate

enough that operations can be performed safely.

Shadows, glare, or strobe effects that may distract

or impede the operator must be eliminated.

Children or untrained people

may be seriously injured by

this machine. Only install in an

access restricted location.

⁄4"

33"

Model G0720R (Mfg. Since 11/10)

-15-

Mounting to

Workbench

Your mill should be bolted to a workbench to pro-

vide maximum rigidity and safety.

Components and Hardware Needed: Qty

Hex Bolts

⁄2"-13 x (length as needed)................4

Flat Washers

⁄2" .................................................8

Lock Washers

⁄2" ...............................................4

Hex Nuts

⁄2"-13 ..................................................4

To mount the mill to the workbench:

1. Determine the best position for the mill on the

workbench.

Note: For the best performance, make

sure the cross feed and the longitudinal

handwheels extend out beyond the edge of

the table surface. This will allow unrestricted

handwheel operation.

2. Mark your hole locations using the mounting

holes in the base as a guide.

3. Drill the holes needed in the workbench.

4. Place a precision level on the mill table and

shim the mill until it is level side-to-side and

front-to-back.

5. Bolt the mill to the top of the workbench (see

Figure 7).

Mill Base

Workbench

Bolt

Flat Washer

Lock Washer

Hex Nut

Figure 7. Example of a through mount setup.

Test Run

Once the assembly is complete, test run your

machine to make sure it runs properly and is

ready for regular operation. The test run consists

of verifying the following: 1) The motors power up

and run correctly and 2) the stop button and chip

guard safety feature works correctly.

If, during the test run, you cannot easily locate

the source of an unusual noise or vibration, stop

using the machine immediately, then review

Troubleshooting on Page 34. If you cannot find

a remedy, contact our Tech Support at (570) 546-

9663 for assistance.

To test run the machine:

1. Push the EMERGENCY STOP button in,

and turn the main power switch to OFF (see

Figure 8).

Figure 8. Machine controls.

Emergency

Stop Button

Main

Power

Switch

Chip Guard

Speed

Dial

Mill

Start

Button

Power ON

Light

RPM

Display

Headstock

UP/DOWN

Buttons

Before starting the machine, make sure you

have performed the preceding assembly

and adjustment instructions. You must read

through the rest of the manual and under-

stand the various functions and safety fea-

tures. Failure to follow this warning could

result in serious personal injury or even

death!

-16-

Model G0720R (Mfg. Since 11/10)

2. Do all lubrication procedures highlighted in

Lubrication in SECTION 6: MAINTENANCE

on Page 30.

3. If there is no arbor or chuck installed in the

spindle, remove the drawbar cap and the

drawbar to prevent vibration.

Note: The drawbar cap has left-hand threads

and loosens when turned clockwise.

4. Put on safety goggles, make sure the area is

clean, all tools are put away, and no entan-

glement hazards exist.

5. Rotate the spindle speed dial (see Figure 8)

counterclockwise to the slowest setting.

6. Close the chip guard (see Figure 8) and con-

nect the machine to power.

7. Twist the EMERGENCY STOP button clock-

wise so it pops out and is reset.

Note: The power ON light shown in Figure 8

illuminates to indicate that all machine con-

trols are now LIVE and ready for use.

8. Loosen the headstock lock levers, and push

the UP and DOWN buttons to test the head-

stock elevation motor.

9. Push the START button to start the spindle.

—When operating correctly, the machine

runs smoothly with little or no vibration or

rubbing noises.

— Investigate and correct strange or unusual

noises or vibrations before operating the

machine further. Always disconnect the

machine from power when investigating or

correcting potential problems.

10. Test the variable speed by turning the spindle

speed dial up then down.

11. Press the EMERGENCY STOP button to

stop the spindle.

12. WITHOUT resetting the EMERGENCY STOP

switch, press the START button. The machine

should not start.

13. Reset the EMERGENCY STOP switch, open

the chip guard, and press the START button

again. The machine should not start.

—If the machine starts, shut it OFF and,

disconnect it from power. Do not operate

the machine any further until the safety

features are fixed.

14. Test run is complete. Next, complete Spindle

Break-In before putting the mill into full ser-

vice.

NOTICE

Failure to follow start up and spindle break-

in procedures will likely cause rapid dete-

rioration of spindle and other related parts.

Model G0720R (Mfg. Since 11/10)

-17-

Spindle Break-In

Before putting this machine into full service, the

Test Run must be completed and the spindle

bearings must be broken in.

To break in the machine:

1. Move the MILLING & TAPPING mode switch

(see Figure 9) to the TAPPING position.

2. Push the START button.

Note: When in tapping mode, the spin-

dle speed is reduced by half automatically,

and the speed range will be 50–800 RPM.

Tapping requires lower speeds than other

milling operations.

3. Rotate the spindle speed dial so the spindle

runs at 500 RPM, and let it run for ten min-

utes.

4. Increase the speed to 800 RPM, and let it run

for another ten minutes.

5. Push the EMERGENCY STOP button, and

rotate the spindle speed dial counterclock-

wise to its minimum position.

6. Start the mill, and push one of the three but-

tons on the end of the downfeed handles to

reverse spindle rotation.

7. Run the mill again at both speeds (as

described above) to finish the break-in proce-

dure.

8. Move the MILLING & TAPPING mode switch

to the MILLING position, then run machine at

a speed of 1600 RPM for ten minutes.

9. Run the machine at 800 RPM for another 15

minutes to allow it cool down.

Figure 9. Tapping controls.

Milling &

Tapping

Mode

Switch

Spindle Rotation Direction Buttons

DO NOT leave the area while break-in pro-

cedure is under way. You must be ready to

stop the machine if any problem occurs.

-18-

Model G0720R (Mfg. Since 11/10)

SECTION 4: OPERATIONS

To complete a typical operation, the

operator does the following:

1. Examines the workpiece to make sure it is

suitable for milling.

2. Puts on the required safety gear.

3. Firmly clamps the workpiece to the table.

4. Installs the correct cutting tool for the opera-

tion.

5. Uses the manual downfeed and table con-

trols to confirm the correct positioning of the

cutting tool and workpiece for the operation.

6. Sets the digital depth stop and mini digital

protractor to the required units of measure-

ment.

7. Locks the headstock and the required table

locks in place.

8. Determines the feed rate and cutting speed.

9. Connects the machine to power, and turns

the main power switch ON.

10. Presses the start button and adjusts the

spindle RPM with the spindle speed dial.

11. Begins milling, drilling, or tapping.

12. When finished, turns the mill OFF and dis-

connects it from power.

Operation Overview

The purpose of this overview is to provide the nov-

ice machine operator with a basic understanding

of how the machine is used during operation, so

the

machine controls/components

discussed later

in this manual

are easier to understand.

Due to the generic nature of this overview, it is

not

intended to be an instructional guide. To learn

more about specific operations,

read this entire

manual,

seek additional

training from experienced

machine operators

, and do additional research

outside of this manual by reading "how-to" books,

trade magazines, or websites.

Damage to your eyes and lungs could result

from using this machine without proper pro-

tective gear. Always wear safety glasses and

a respirator when operating this machine.

To reduce the risk of

serious injury when using

this machine, read and

understand this entire

manual before operating.

NOTICE

If you have never used this type of machine

or equipment before, WE STRONGLY REC-

OMMEND that you read books, review

industry trade magazines, or get formal

training before beginning any projects.

Regardless of the content in this section,

Grizzly Industrial will not be held liable for

accidents caused by lack of training.

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Grizzly G0720R Owner's manual

Grizzly G0720R Owner's manual

Grizzly G0720R Owner's manual

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