264 ISO Programming
4.17 Contour-Based Turning Cycles
Feed rate reduction
For chamfers/rounding arcs, the following applies:
Feed rate is programmed with G95-Geo: No automatic feed rate
reduction.
Feed rate is not programmed with G95-Geo: Automatic feed rate
reduction. Each chamfer/rounding is therefore machined with at
least three revolutions.
For chamfers/rounding arcs which, as a result of their size, are
machined with at least three revolutions, the feed rate is not
reduced automatically.
For circular elements, the following applies:
For small circular elements, the feed rate is decreased until every
element is machined with at least four spindle revolutions. You
can switch this feed rate reduction off with O.
The tool radius compensation (TRC) results under certain
conditions to a feed rate reduction for circular elements (see
“Tool-Tip and Cutter Radius Compensation” on page 233). You
can switch this feed rate reduction off with O.
A G57 oversize enlarges the contour (also inside
contours).
A G58 oversize
>0: Enlarges the contour
<0: Reduces the contour
G57/G58 oversizes are deleted after cycle end.
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