HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 247)

HEIDENHAIN TNC 620 247
8.2 Cy
cles f
o
r Dr
illing, T
apping 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
Use the machine parameter displayDepthErr to define
whether, if a positive depth is entered, the TNC should
output an error message (on) or not (off).
Danger of collision!
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
at safety clearance below the workpiece surface!
Z
X
Q203
Q204
Q200
Q201
Q239