Function of Tool Features for Face Milling

Cutting Edge Run-out Accuracy

Cutting edge run-out accuracy of indexable inserts on the cutter body greatly affects the surface finish and tool life.

Improve Finished Surface Roughness

Usually the minor cutting edges are set parallel to the face of a milling cutter and theoretically the finished surface accuracy should be maintained, even if run-out accuracy is poor.

  • Replace one normal insert with wiper insert.
  • Wiper inserts are set to protrude by .0012 ― .004 inch from the standard inserts.

Value depends on the cutting edge and insert combination.

How to Set a Wiper Insert

  • Wiper edge length has to be longer than the feed per revolution.
    * Too long wiper edge causes chattering.
  • When the cutter diameter is large and feed per revolution is longer than the wiper edge, use two or three wiper inserts.
  • When using two wiper inserts or more, eliminate run-out of wiper inserts. · Use a high hardness grade (high wear resistance) for wiper inserts.