Path Velocity in Arcs

When the cutter radius compensation is active, the programmed radius changes for arcs. This in turn alters the velocity. The following commands are used to specify whether the feed value refers to the contour or the tool center point.

Constant Feed at the Contour

Command	CFC
Cancellation	CFIN or CFTCP

With CFC (constant feed contour) the feedrate at the contour is held constant.

Constant Feed at the Internal Radius

Command	CIN
Cancellation	CFC or CFTCP

With CFIN (constant feed internal radius) the feedrate at internal radii is reduced. This results in a constant velocity at the contour. The velocity at external radii is not increased.

Constant Feed of the Tool Centre Point

Command	CFTCP
Cancellation	CFC or CFIN

With CFTCP (constant feed tool center point) the feedrate of the tool’s center point is kept constant. This means that at internal radii the velocity at the contour is increased, and that it is correspondingly reduced at external radii.