Cycle Parameters - HEIDENHAIN TNC 620 User Manual

Fixed Cycles: Tapping / Thread Milling | OUTSIDE THREAD MILLING (Cycle 267, DIN/ISO: G267, software
option 19)

Cycle parameters

Q335 Nominal diameter?: Thread nominal
diameter. Input range 0 to 99999.9999
Q239 Pitch?: 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
Q201 Depth of thread? (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Q355 Number of threads per step?: Number of
thread grooves by which the tool is shifted:
0 = one helix on the thread depth
1 = continuous helix on the complete thread
length
>1 = several helical paths with approach and
departure; between these the TNC shifts the tool
by Q355 multiplied by the pitch. Input range 0 to
99999
Q253 Feed rate for pre-positioning?: Traversing
speed of the tool in mm/min when plunging
into the workpiece, or when retracting from
the workpiece. Input range 0 to 99999.9999
alternatively fmax, FAUTO
Q351 Direction? Climb=+1, Up-cut=-1: Type of
milling operation with M3
+1 = Climb milling
= Up-cut milling (if you enter 0, climb milling is
–1
performed)
Q200 Set-up clearance? (incremental): Distance
between tool tip and workpiece surface. Input
range 0 to 99999.9999
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
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