2 – 18 HEIDENHAIN Technical Manual TNC 426, TNC 430
User Functions TNC 426 and TNC 430
Program entry HEIDENHAIN conversational and ISO
Position data nNominal positions for straight lines and circles in Cartesian or
polar coordinates
nAbsolute or incremental dimensional data
nDisplay and input in mm or inches
nDisplay of handwheel path during machining with handwheel
superpositioning
Contour approach and departure nVia straight line: tangential or perpendicular (APPR/DEP),
nVia circular arc (APPR/DEP)
nVia rounding radius (RND)
Tool compensation nTool radius in the working plane, tool length
nRadius compensated contour look ahead for up to 99 blocks
(M120)
Cutting data table For automatic calculation of speed and feed rate from various
definable combinations of tool and workpiece materials
Constant contour speed nWith respect to the path of the tool center
nWith respect to the tool cutting edge (M109, M110, M111)
3-D machining nInsertion of rounding radius between two straight line segments
(M112, M113, M124)
nReduced feed rate during plunging (M103)
n3-D tool compensation through surface normal vectors
nAutomatic compensation of machine geometry when working
with tilted axes (M114, M115, M128, M130)
nChanging the position of the swivel head with the electronic
handwheel during program run. The position of the tool tip does
not change.
nJerk reduction
nSpline
nTool perpendicular to contour
nTool radius compensation perpendicular to traversing and tool
direction
Machining with rotary tables nProgramming a contour on a cylindrical surface as if on a plane
nFeed rate in mm/min (M116)
FK free contour programming FK free contour programming in HEIDENHAIN conversational
format with graphic support for workpiece drawings not
dimensioned for NC
Subprogramming Program section repeats, subprograms, program calls
Background programming Creating or editing a program while another program is being run
— also with graphical support
Fixed cycles nPeck drilling, tapping with or without a floating tap holder, rea-
ming, boring, hole patterns, slot milling, rectangular and circular
pocket milling, facing milling of plane surfaces
nOEM cycles (special cycles developed by the machine tool buil-
der) can also be integrated
nContour pockets — also contour parallel
nContour train