HEIDENHAIN TNC 426, TNC 430 203
8.1 Working with Cycles
Example NC blocks
7 CYCL DEF 200 DRILLING
Q200=2 ;SET-UP CLEARANCE
Q201=-20 ;DEPTH
Q206=150 ;FEED RATE FOR PLUNGING
Q202=5 ;PLUNGING DEPTH
Q210=0 ;DWELL TIME AT TOP
Q203=+0 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
Q211=0.25 ;DWELL TIME AT BOTTOM
Group of cycles Soft key
Cycles for pecking, reaming, boring, counterboring,
tapping and thread cutting
Cycles for milling pockets, studs and slots
Cycles for producing hole patterns, such as circular or
linear patterns
SL (Subcontour List) cycles which allow the contour-
parallel machining of relatively complex contours
consisting of several overlapping subcontours,
cylinder surface interpolation
Cycles for face milling of flat or twisted surfaces
Coordinate transformation cycles which enable datum
shift, rotation mirror image, enlarging and reducing for
various contours
Special cycles such as dwell time, program call,
oriented spindle stop and tolerance
If you use indirect parameter assignments in fixed cycles
with numbers greater than 200 (e.g. Q210 = Q1), any
change in the assigned parameter (e.g. Q1) will have no
effect after the cycle definition. Define the cycle
parameter (e.g. Q210) directly in such cases.
In order to be able to run cycles 1 to 17 on older TNC
models, you must program an additional negative sign
before the values for safety clearance and plunging depth.
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