Finishing Cycle Run; Please Note While Programming - HEIDENHAIN TNC 640 User Manual

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Finishing cycle run

If the Z coordinate of the starting point is less than the contour
starting point, the TNC positions the tool in the Z coordinate to set-
up clearance and begins the cycle there.
1 The TNC runs the infeed motion at rapid traverse.
2 The TNC finishes the finished part contour (contour starting
point to contour end point) at the defined feed rate Q505.
3 The TNC returns the tool to set-up clearance at the defined feed
rate.
4 The TNC positions the tool back at rapid traverse to the cycle
starting point.

Please note while programming:

Danger of collision!
The cutting limit defines the contour range to be machined. The
approach and departure paths can exceed the cutting limits. The
tool position before the cycle call influences the execution of the
cutting limit. The TNC 640 machines the area to the right or to
the left of the cutting limit, depending on which side the tool has
been positioned before the cycle is called.
Before the cycle is called position the tool so that it is already
on the side of the cutting limit on which the material is to be
cut
Program a positioning block to a safe position with
radius compensation R0 before the cycle call.
The tool position at cycle call (cycle starting point)
affects the area to be machined.
The TNC takes the cutting geometry of the tool into
account to prevent damage to contour elements. If
complete machining with the active tool is not possible,
a warning is output by the TNC.
Before calling the cycle you must program the cycle 14
CONTOUR to define the subprogram number.
Also refer to the fundamentals of turning cycles (See
page 374).
When you use local QL Q parameters in a contour
subprogram you must also assign or calculate these in
the contour subprogram.
412
NOTICE
Cycles: Turning | TURN CONTOUR FACE
(Cycle 820, DIN/ISO: G820)
HEIDENHAIN | User's manual for cycle programming | 10/2017