MITSUBISHI MATERIALS CORPORATION
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FUNCTION OF TOOL FEATURES FOR TURNING

RADIUS
Radius effects the cutting edge strength and finished surface. In general, a corner radius 2 3 times the feed is recommended.
Corner Radius and Finished Surface

Corner Radius Size and Tool Life Due to Fracturing
Corner Radius Size and Tool Wear

Effects of Corner Radius
  1. Increasing the corner radius improves the surface finish.
  2. Increasing the corner radius improves cutting edge strength.
  3. Increasing the corner radius too much increases the cutting resistance and causes chattering.
  4. Increasing the corner radius decreases flank and rake wear.
  5. Increasing the corner radius too much results in poor chip control.
When to Decrease Corner Radius
  • Finishing with small depth of cut.
  • Thin, long workpieces.
  • When the machine has poor rigidity.
When to Increase Corner Radius
  • When the cutting edge strength is required such as in interrupted cutting and uncut surface cutting.
  • When roughing a workpiece with large diameter.
  • When the machine has high rigidity.

Corner Radius and Chip Control Range
Corner Radius and Chip Control Range
Note)
Please refer to page P004 for chip shapes (A, B, C, D, E).