Turn Contour Face (Cycle 820, Din/Iso: G820); Application; Roughing Cycle Run - HEIDENHAIN TNC 640 User Manual

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Cycles: Turning | TURN CONTOUR FACE

(Cycle 820, DIN/ISO: G820)

12.15 TURN CONTOUR FACE

(Cycle 820, DIN/ISO: G820)

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.

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

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

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

6 The TNC positions the tool back at rapid traverse to the cycle

starting point.

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