HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 411)

AXIAL RECESSING
(Cycle 870, DIN/ISO: G870)
12.27
12
TNC 640 | User's Manual Cycle Programming | 1/2015
411
12.27 AXIAL RECESSING
(Cycle 870, DIN/ISO: G870)
Application
This cycle enables you to axially cut in slots of any form (face
recessing).
You can use the cycle either for roughing, finishing or complete
machining. Turning is run paraxially with roughing.
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 positions the tool at rapid traverse in the X coordinate
(first cut-in position).
2 The TNC runs a paraxial infeed motion at rapid traverse (lateral
infeed = 0.8 cutting width).
3 The TNC cuts the area between the starting position and the
end point in axial direction at the defined feed rate Q478.
4 The TNC positions the tool back at rapid traverse to the
beginning of cut.
5 The TNC repeats this process (2 to 4) until the slot form is
completed.
6 The TNC positions the tool back at rapid traverse to the cycle
starting point.