HEIDENHAIN TNC 320 (34055x-06) Cycle programming - Manual (Page 113)

OUTSIDE THREAD MILLING (Cycle 267, DIN/ISO: G267) 4.10
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TNC 320 | User's Manual Cycle Programming | 5/2013
113
Please note while programming:
Program a positioning block for the starting point
(stud center) in the working plane with radius
compensation
R0.
The offset required before countersinking at the front
should be determined ahead of time. You must enter
the value from the center of the stud to the center of
the tool (uncorrected value).
The algebraic sign of the cycle parameters depth
of thread or sinking depth at front determines the
working direction. The working direction is defined in
the following sequence:
1. Thread depth
2. Depth at front
If you program a depth parameter to be 0, the TNC
does not execute that step.
The algebraic sign for the cycle parameter "thread
depth" determines the working direction.
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
Threads per step Q355: Number of thread starts by
which the tool is displaced:
0 = one helix on the thread depth
1 = continuous helix on the complete thread length
>1 = several helix paths with approach and
departure, between these the TNC sets the tool by
Q355 x pitch. Input range 0 to 99999