Programming Motion Commands
4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
4-71
Combinability
Note
"Measure and delete distance-to-go" ("MEAS" command) and "Travel to fixed stop" cannot
be programmed in the same block.
Exception: One function acts on a path axis and the other on a positioning axis or both act
on positioning axes.
Contour monitoring
Contour monitoring is not performed while "Travel to fixed stop" is active.
Positioning axes
With "Travel to fixed stop" with POSA axes, the block change takes place independently of
the fixed stop movement.
Restrictions
Travel to fixed stop cannot be programmed
• for hanging axes (exception: possible on 840D with SIMODRIVE 611 digital),
• for gantry axes,
• for concurrent positioning axes, which are controlled exclusively by the PLC (FXS must
be selected from the NC program).
• If the torque limit is reduced too far, the axis will not be able to follow the specified
setpoint; the position controller then goes to the limit and the contour deviation increases.
In this operating state there can be jerky movements when the torque limit is increased.
To ensure that the axis can follow the setpoint, check the contour deviation to make sure
it is not greater than the deviation with an unlimited torque.
4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Function
You can insert the following elements at a contour corner:
• Chamfer or
• Rounding
If you wish to round several contour corners sequentially by the same method, use
command RNDM "Modal rounding". This address is for inserting a rounding between linear
and circle contours after each traversing block. This is, for example, for deburring sharp
workpiece edges.
You can program the feedrate for the chamfer/rounding with FRC (non-modal) or FRCM
(modal).
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