HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 285)

HEIDENHAIN iTNC 530 285
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
8 Nominal diameter Q335: Nominal thread diameter.
8 Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+ = right-hand thread
– = left-hand thread
8 Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread.
8 Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min.
8 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.
8 Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center.
8 Countersink Q360: Execution of the chamfer
0 = before thread machining
1 = after thread machining
8 Setup clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.