HEIDENHAIN ITNC 530 User Manual page 342

Nominal diameter Q335: Nominal thread diameter.
Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+= right-hand thread
–= left-hand thread
Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread.
Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min.
Depth at front Q358 (incremental value): Distance
between tool tip and the top surface of the workpiece
for countersinking at the front of the tool.
Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center.
Countersink Q360: Execution of the chamfer
0 = before thread machining
1 = after thread machining
Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.
342 8 Programming: Cycles