Bulk Man 3D OX CNC Mechanical Assembly Instructions

OX CNC

Mechanical Assembly Instructions

Bulk Man 3D

v1.2 2019

OX CNC Assembly Instructions 1 v1.1

Contents

About The Ox CNC Kit ............................................................................................................................. 2

Unpack and Check All Components ........................................................................................................ 2

Tools Required ........................................................................................................................................ 2

Pre-Assembly Notes ................................................................................................................................ 2

Wheel Assembly ...................................................................................................................................... 3

Y-Axis Plate Assembly ............................................................................................................................. 4

X-Axis Gantry Assembly – Front Plate ..................................................................................................... 7

X-Axis Gantry Assembly – Back Plate .................................................................................................... 10

X-Axis Front and Back Plate Assembly .................................................................................................. 11

Z-Axis Assembly..................................................................................................................................... 14

X-Axis Gantry Assembly ........................................................................................................................ 19

Ox Base Assembly ................................................................................................................................. 23

GT3 Timing Belt and Pulley Assembly ................................................................................................... 26

Finished ................................................................................................................................................. 30

Post Assembly Notes: ............................................................................................................................ 31

Credits ................................................................................................................................................... 31

OX CNC Assembly Instructions 2 v1.1

About The Ox CNC Kit

The mechanical kit is based on the Open Builds Ox CNC Router designed by Mark Carew and

published on openbuilds.com. There are however a couple of difference between Mark’s design and

this Ox Kit. None of the differences are that great and the Openbuilds YouTube videos available on

putting the Ox together are a great resource and starting point for everyone. Most of the differences

are a result of customer feedback and modifications published on a wide number of internet forums.

Please note that while we have spent a considerable amount of time and effort putting these

instructions together, any errors and omissions excepted (E&OE). If you find an error, please let us

know so we can continually improve this resource.

Unpack and Check All Components

Before starting any build, it is always a great idea to get organised. Start by unpacking your kit and

checking it against the BOM (Bill of Materials) in Appendix 1. If you find any parts missing, please

contact us as soon as possible.

Tools Required

You will also need the following tools:

• 3mm Allen Key

• 8mm Spanner

• 10mm Spanner

• Screw Drivers

• M5 Tap

• Hack Saw (or other means to cut V-Slot)

• Builder‘s Square

Pre-Assembly Notes

1. While these instructions have drawings for the Large Ox, construction of the Small Ox is, in

principle, the same.

2. It is Important to make sure all angles are square. As you progress through your build, use

the Square to make sure everything is aligned before the final tightening of all screws and

nuts.

3. This build requires some of the V-Slot to be tapped with a M5 tap. In general tap to a depth

of 8-10mm. and clean away any swarf and burs.

OX CNC Assembly Instructions 3 v1.1

4. When placing any V-Wheels onto the V-Slot, make sure the Eccentric Spacers are adjusted to

their furthest point. Do not force the wheels on as this may damage them creating a little

‘bump’.

5. The Sketchup model is available for download from our website. It is a fantastic resource

and can allow you to move through the design, pull things apart, and measure wherever

required. We strongly recommend downloading the model and becoming familiar with

Sketchup.

Wheel Assembly

Assemble all the Solid V Wheels as per the drawing. It can help to use one of the longer screws to

align everything by threading the parts on one by one.

OX CNC Assembly Instructions 4 v1.1

Y-Axis Plate Assembly

The NEMA23 stepper motor is attach as shown. Make sure the 3mm spacers are between the Gantry

Plate and the Stepper. Don’t tighten too much just yet as a little play is needed when tightening the

belts later.

OX CNC Assembly Instructions 5 v1.1

Attach the wheels to the gantry. Use Eccentric spacers on the 3 lower wheel and 6.35mm spacer on

the upper 4 wheels. Tighten the top sets but not the bottom as they will need to be adjusted when

put on the V-Slot.

OX CNC Assembly Instructions 6 v1.1

Complete both the left and right plates as shown below.

OX CNC Assembly Instructions 7 v1.1

X-Axis Gantry Assembly – Front Plate

Attach the spacer blocks with M5 x 10mm screws. If you have 2040 for your Z-axis then use the

nearer set of holes, if you have 2060 then use the otter set.

OX CNC Assembly Instructions 8 v1.1

Using M5 x 45mm screws attach the V-Wheels through the Gantry Plate and the spacer blocks. Use 3

x Eccentric spacers on one spacers block and 3 x 6.35mm spacers on the other.

OX CNC Assembly Instructions 9 v1.1

Attach the nut block as shown.

OX CNC Assembly Instructions 10 v1.1

X-Axis Gantry Assembly – Back Plate

Attach the NEMA23 stepper to the gantry plate with 4 x M5 20mm screws, making sure to place the

3mm spacer in between the gantry plate and the NEMA23.

OX CNC Assembly Instructions 11 v1.1

X-Axis Front and Back Plate Assembly

Placing the spacers, shims and wheels as per the drawings below, attach the front and back plates

using the 4 x M5 x 65mm screws. Note two eccentrics are on each lower screw.

OX CNC Assembly Instructions 12 v1.1

OX CNC Assembly Instructions 13 v1.1

OX CNC Assembly Instructions 14 v1.1

Z-Axis Assembly

First make sure you have tapped (M5) all the holes in the Z-Axis V-Slot to a depth of approx. 8mm.

Attach Flexible Coupling to the NEMA23, then using the 40mm Spacers attach the NEMA23 to the

Threaded Rod Plate as shown. Make sure the bearing recess in the plate is facing away from the

NEMA23 (see below).

OX CNC Assembly Instructions 15 v1.1

Using 3 x 8mm screws, attach the Threaded Rod assembly to the Z-Axis V-Slot.

OX CNC Assembly Instructions 16 v1.1

Mount the X Gantry onto the Z-Axis V-Slot and, turning by hand, screw the Lead Screw into the Nut

Block about ½ way. Attach the bearing and collar and push the Lead Screw into the Flexible Coupling.

Tighten the coupling, make sure the bearing is correctly seated in the Threaded Road Plate recess.

Slide the collar to the bearing and tighten.

OX CNC Assembly Instructions 17 v1.1

At the other end, slide on the Lock Collar and bearing. Screw the remaining Threaded Rod Plate into

the V-Slot. Seat the bearing and tighten the collar.

OX CNC Assembly Instructions 18 v1.1

The completed X/Z assembly should look like this:

Test the assembly by hand turning the lead screw. Adjust the 3 Eccentric Spacers with a 10mm

spanner to that there is no lateral movement. Tighten all screws and test again by hand turning the

lead screw. If the gantry is to tight then re-adjust the eccentric spacers.

OX CNC Assembly Instructions 19 v1.1

X-Axis Gantry Assembly

Before starting the X Axis Gantry, make sure to tap (M5) all the holes on the 2060 and 2040 to 8mm

depth.

Screw the 2060 and 2040 to the Y Plate.

Bulk Man 3D OX CNC Mechanical Assembly Instructions

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