HEIDENHAIN TNC 620 (340 56x-03) Cycle programming - Manual (Page 105)

HEIDENHAIN TNC 620 105
4.6 THREAD MILLING (Cy
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262, DIN/ISO: G262, A
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Option)
4.6 THREAD MILLING (Cycle 262,
DIN/ISO: G262, Advanced
Programming Features
Software Option)
Cycle run
1 The TNC positions the tool in the spindle axis at rapid traverse
FMAX to the entered set-up clearance above the workpiece
surface.
2 The tool moves at the programmed feed rate for pre-positioning to
the starting plane. The starting plane is derived from the algebraic
sign of the thread pitch, the milling method (climb or up-cut milling)
and the number of threads per step.
3 The tool then approaches the thread diameter tangentially in a
helical movement. Before the helical approach, a compensating
motion of the tool axis is carried out in order to begin at the
programmed starting plane for the thread path.
4 Depending on the setting of the parameter for the number of
threads, the tool mills the thread in one helical movement, in
several offset movements or in one continuous movement.
5 After this, the tool departs the contour tangentially and returns to
the starting point in the working plane.
6 At the end of the cycle, the TNC retracts the tool at rapid traverse
to the set-up clearance, or—if programmed—to the 2nd set-up
clearance.
X
Y
Q207
Q335