HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 254)

254 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
 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.
X
Y
Q207
Q335
X
Z
Q203
Q253
Q239
Q201
Q204
Q200
X
Z
Q359
Q358