Video: Trochoidal Milling

This approach to rough milling replaces straight lines with “curlicue” moves of constant radius.

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Photo courtesy Delcam. Video shows trochoidal milling in 52 Rc D-2 steel using a six-flute end mill. Video courtesy Niagara Cutter



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This is an approach to rough milling in which straight lines are replaced by “curlicue” circular moves of constant radius. Potential benefits include:

  • Faster metal removal. Making the constant circular curve the only direction change allows a high feed rate to be consistently maintained.
  • Longer tool life. The cutting edge is in contact with the material through only about 5% of the cutter’s revolution vs. up to 50% for more conventional cutting. Cooling of the tool is improved.

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