Manual

48
3. Turning
Depth of cut, AP, and feed, f
n
The combination of AP and f
n
is important to achieve the best
possible chip areas. Two rules of thumb:
• Program AP larger than the nose radius
• Program for an f
n
that is a minimum of 25% of the nose radius,
depending on what surface nish is required
One of the rst things to consider if you experience vibration when
machining with long overhangs is to increase the feed and a
second remedy, change the cutting speed. Usually, the best results
are achieved with higher cutting speed.
Chip area
• If the chip area is too large, the cutting forces are too large
• If the chip area is too small, the friction between tool and work-
piece is too great and a rubbing effect can occur