Sandvik Coromant Silent tools - application guide - Manual (Page 71)

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4. Boring
Force direction mainly axial Force direction both axial and radial
Nose radius in relation to depth of cut
The radial forces that push the insert away from the cutting surface
become more axial as the depth of cut increases. The nose radius
also affects the chip formation. Generally, chip breaking improves
with a smaller radius. As a general rule of thumb, the depth of cut
should be greater than or equal to 2/3 of the nose radius or half
the nose radius in the feed direction.
Feed starting values depending on nose radius
Nose radius size
(mm)
0.4 0.8 1.2
Feed
(mm/r)
0.17 0.22 0.27