HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 282)

282 DIN programming
4.1
7
Cont
our
-based t
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rn
ing cy
cles
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 247.). 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.