Siemens SINUMERIK 840Di sl Programming Manual page 194

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Motion commands

4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)

Feed FRC (non-modal), FRCM (modal)

To optimize surface quality, it is possible to program a separate feedrate for the

chamfer/rounding contour elements. FRC is non-modal and FRCM is modal, see examples.

Example of chamfer, CHF/CHR

For the chamfer insert another linear part, the chamfer, between the linear and the circle

contours in any combination. The following two options are available:

N30 G1 X... Z... F... CHR=2

N40 G1 X... Z...

N30 G1 X... Z... F... CHF=2(cos α ·2)

N40 G1 X... Z...

The chamfer is inserted after the block, in which it is programmed. The chamfer is always in

the plane activated with G17 to G19.

Modal feedrate for chamfer/rounding

Value = feedrate in mm/min (G94) or mm/rev (G95)

=0: The feedrate programmed under F for the chamfer/rounding is active.

Programming Manual, 11/2006, 6FC5398-1BP10-2BA0

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