HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 238)

238 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
 Set-up clearance Q200 (incremental value): Distance
between tool tip (at starting position) and workpiece
surface.
 Thread depth Q201 (incremental value): Distance
between workpiece surface and end of thread.
 Pitch Q239
Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+ = right-hand thread
– = left-hand thread
 Workpiece surface coordinate Q203 (absolute
value): Coordinate of the workpiece surface.
 2nd set-up clearance Q204 (incremental value):
Coordinate in the spindle axis at which no collision
between tool and workpiece (clamping devices) can
occur.
 Infeed depth for chip breaking Q257 (incremental
value): Depth at which TNC carries out chip breaking
Z
X
Q203
Q204
Q200
Q201
Q239