Sandvik Coromant Parting and grooving - users guide - Manual (Page 39)

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2
3
1
2
3
Roughing
When roughing the first cut should always
be on the largest diameter and work inwards.
Cut one gives chip control but no chip
breaking and the width of cuts two and three
should be 0.5–0.8 x width of the cutting
edge. Chip breaking will now be operating
at an acceptable level and thus, after the first
insertion, the feed can be slightly increased.
When retracting, offset the insert slightly
from the inner edge of the groove.
Finishing
When finishing, machine the first cut within
the given diameter range.
For more information, see page 30.
The second cut finishes the diameter, radius
and faceturns inwards.
Finally the third cut finishes the inner diam-
eter to correct dimensions.
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2
Practical hints
1. If the support web on the tool rubs against the
workpiece diameter on the inner side of the sup-
port web:
tool is wrong size for the diameter range; •
change tool.
tool is not parallel to axis of rotation; correct.
•
lower the tool below the centre line. •
2. If the support web on the tool rubs against the
workpiece diameter on the outer side of the sup-
port web:
tool is wrong size for the diameter range; •
change tool.
tool is not parallel to axis of rotation; correct.
•
lift the tool above the centre line. •