HEIDENHAIN TNC 426, TNC 430 247
8.3 Cycles for Drilling, Tapping and Thread Milling
U Nominal diameter Q335: Nominal thread diameter
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
U Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread
U Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
U Depth at front Q358 (incremental value): Distance
between tool point and the top surface of the
workpiece for countersinking at the front of the tool
U Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center
U Countersink Q360: Execution of the chamfer
0 = before thread machining
1 = after thread machining
U Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface
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