HEIDENHAIN TNC 426, User Manual

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228 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
U Set-up clearance Q200 (incremental value): Distance
between tool tip (at starting position) and workpiece
surface. Standard value: approx. 4 times the thread
pitch
U Total hole depth Q201 (thread length, incremental
value): Distance between workpiece surface and end
of thread
U Feed rate F Q206: Traversing speed of the tool during
tapping
U Dwell time at bottom Q211: Enter a value between 0
and 0.5 seconds to avoid wedging of the tool during
retraction
U Workpiece surface coordinate Q203 (absolute
value): Coordinate of the workpiece surface
U 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
The feed rate is calculated as follows: F = S x p
Retracting after a program interruption
If you interrupt program run during tapping with the machine stop
button, the TNC will display a soft key with which you can retract the
tool.
Example: NC blocks
25 CYCL DEF 206 TAPPING NEW
Q200=2 ;SET-UP CLEARANCE
Q201=-20 ;DEPTH
Q206=150 ;FEED RATE FOR PLUNGING
Q211=0.25 ;DWELL TIME AT BOTTOM
Q203=+25 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
F Feed rate (mm/min)
S: Spindle speed (rpm)
p: Thread pitch (mm)