HEIDENHAIN TNC 320 (34055x-06) Cycle programming - Manual (Page 103)

THREAD MILLING/COUNTERSINKING (Cycle 263, DIN/ISO:G263) 4.7
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TNC 320 | User's Manual Cycle Programming | 5/2013
103
Please note while programming:
Program a positioning block for the starting point
(hole center) in the working plane with radius
compensation
R0.
The algebraic sign of the cycle parameters depth
of thread, countersinking depth or sinking depth at
front determines the working direction. The working
direction is defined in the following sequence:
1. Thread depth
2. Countersinking depth
3. Depth at front
If you program a depth parameter to be 0, the TNC
does not execute that step.
If you want to countersink at front, define the
countersinking depth as 0.
Program the thread depth as a value smaller than the
countersinking depth by at least one-third the thread
pitch.
Danger of collision!
Use the machine parameter displayDepthErr to
define whether, if a positive depth is entered, the
TNC should output an error message (on) or not (off).
Keep in mind that the TNC reverses the calculation
for pre-positioning when a
positive depth is
entered . This means that the tool moves at rapid
traverse in the tool axis to set-up clearance below
the workpiece surface!
Cycle parameters
Nominal diameter Q335: Nominal thread diameter.
Input range 0 to 99999.9999
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
Thread depth Q201 (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Countersinking depth Q356 (incremental):
Distance between tool tip and the top surface of the
workpiece. Input range -99999.9999 to 99999.9999
Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min. Input range 0 to 99999.9999
alternatively
FMAX, FAUTO