Siemens SINUMERIK 840Di sl - Page 194

Motion commands
4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Fundamentals
194 Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
FRCM=…
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.
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…
or
N30 G1 X… Z… F… CHF=2(cos α ·2)
N40 G1 X… Z…
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The chamfer is inserted after the block, in which it is programmed. The chamfer is always in
the plane activated with G17 to G19.