2 – 26 HEIDENHAIN Technical Manual TNC 426, TNC 430
User functions TNC 426 and TNC 430
Program entry HEIDENHAIN conversational and ISO
Position data n Nominal positions for straight lines and circles in Cartesian or
polar coordinates
n Absolute or incremental dimensional data
n Display and input in mm or inches
n Display of handwheel path during machining with handwheel
superpositioning
Contour approach and departure n Via straight line: tangential or perpendicular (APPR/DEP)
n Via circular arc (APPR/DEP)
n Via rounding radius (RND)
Tool compensation n Tool radius in the working plane, tool length
n Radius 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 n With respect to the path of the tool center
n With respect to the tool cutting edge (M109, M110, M111)
3-D machining n Reduced feed rate during plunging (M103)
n 3-D tool compensation through surface normal vectors
n Automatic compensation of machine geometry when working
with tilted axes (M114, M115, M128, M129, M130)
n Changing the position of the swivel head with the electronic
handwheel during program run. The position of the tool tip does
not change.
n Jerk reduction
n Spline
n Tool perpendicular to contour
n Tool radius compensation perpendicular to traversing and tool
direction
Machining with rotary tables n Programming a contour on a cylindrical surface as if on a plane
n Feed 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 n Peck drilling, tapping with or without a floating tap holder,
reaming, boring, hole patterns, slot milling, rectangular and
circular pocket milling, stud finishing, face milling of plane
surfaces
n OEM cycles (special cycles developed by the machine tool
builder) can also be integrated
n Contour pockets — also contour parallel
n Contour train
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