HEIDENHAIN TNC 320 (340 55x-04) Cycle programming - Manual (Page 116)

116 Fixed Cycles: Tapping / Thread Milling
4.9 HELICAL THREAD DRILLING/MI
LLING (Cy
c
le 265, DIN/ISO: G265)
Cycle parameters
U Nominal diameter Q335: Nominal thread diameter.
Input range 0 to 99999.9999
U Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+ = right-hand thread
– = left-hand thread
Input range -99.9999 to 99.9999
U Thread depth Q201 (incremental): Distance
between workpiece surface and root of thread.
Input range –99999.9999 to 99999.9999
U Feed rate for pre-positioning Q253: Traversing
speed of the tool in mm/min when plunging into the
workpiece, or when retracting from the workpiece.
Input range 0 to 99999.999; alternatively FMAX,
FAUTO
U Depth at front Q358 (incremental): Distance
between tool tip and the top surface of the workpiece
for countersinking at the front of the tool. Input range
–99999.9999 to 99999.9999
U Countersinking offset at front Q359 (incremental):
Distance by which the TNC moves the tool center
away from the hole center. Input range 0 to
99999.9999
U Countersink Q360: Execution of the chamfer
0 = before thread machining
1 = after thread machining
U Setup clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
X
Y
Q207
Q335
X
Z
Q203
Q253
Q239
Q201
Q204
Q200
X
Z
Q359
Q358