HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 343)

TURN CONTOUR FACE
(Cycle 820, DIN/ISO: G820)
13.15
13
TNC 640 | User's Manual Cycle Programming | 3/2014
343
13.15 TURN CONTOUR FACE
(Cycle 820, DIN/ISO: G820)
Application
This cycle enables you to face turn 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 is run paraxially with roughing.
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 the contour starting point 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
the end point in traverse direction. The transverse cut is run
paraxially with the defined feed rate
Q478.
3 The TNC returns the tool at the defined feed rate by one infeed
value.
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.