Axial Recessing Extended (Cycle 872, Din/Iso: G872); Application; Roughing Cycle Run - HEIDENHAIN TNC 640 User Manual

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12.26 AXIAL RECESSING EXTENDED

(Cycle 872, DIN/ISO: G872)

This cycle enables you to axially cut in slots (face recessing).

Expanded scope of function:

You can insert a chamfer or curve at the contour start and

contour end.

In the cycle you can define angles for the side walls of the slot

You can insert radii in the contour edges

You can use the cycle either for roughing, finishing or complete

machining. Turning is run paraxially with roughing.

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 Q492

Contour start in Z, the TNC positions the tool in the Z coordinate

to Q492 and begins the cycle there.

1 For the first full recess, the TNC moves the tool at the reduced

feed rate Q511 to the depth of the plunge + allowance.

2 The TNC retracts the tool at rapid traverse.

3 The TNC performs a stepover of the value Q510 x tool width

4 The TNC then recesses again, this time with the feed rate Q478

5 The TNC retracts the tool as per parameter Q462

6 The TNC cuts the area between the starting position and the

end point by repeating steps 2 through 4

7 As soon as the slot width has been achieved, the TNC positions

the tool at rapid traverse back to the cycle starting point.

Cycles: Turning | AXIAL RECESSING EXTENDED

(Cycle 872, DIN/ISO: G872)

HEIDENHAIN | User's manual for cycle programming | 10/2017