HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 348)

Cycles: Turning
12.10 TURN CONTOUR-PARALLEL
(Cycle 815, DIN/ISO: G815)
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TNC 640 | User's Manual Cycle Programming | 1/2015
12.10 TURN CONTOUR-PARALLEL
(Cycle 815, DIN/ISO: G815)
Application
This cycle enables you to machine workpieces with any turning
contours. The contour description is in a subprogram.
You can use the cycle either for roughing, finishing or complete
machining. Turning with roughing is contour-parallel.
The cycle can be used for inside and outside machining. If the
starting point of the contour is larger than the end point of the
contour, the cycle runs outside machining. If the contour starting
point is less than the end point, the cycle runs inside machining.
Roughing cycle run
The TNC uses the tool position as cycle starting point when a
cycle is called. 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 a paraxial infeed motion at rapid traverse. The
infeed value is calculated by the TNC with Q463 MAX. CUTTING
DEPTH.
2 The TNC machines the area between the starting position and
end point. The cut is run contour-parallel with the defined feed
rate
Q478.
3 The TNC returns the tool at the defined feed rate back to the
starting position in the X coordinate.
4 The TNC positions the tool back at rapid traverse to the
beginning of cut.
5 The TNC repeats this process (1 to 4) until the final contour is
completed.
6 The TNC positions the tool back at rapid traverse to the cycle
starting point.