True equivalent chip thickness for tools with a nose radius

Research output: Contribution to conferencePaper, not in proceedingpeer-review

106 Downloads (Pure)


A majority of the established systems for choice and optimization of cutting data are based on Woxén’s equivalent chip thickness, heW. In metal cutting theory and models, the equivalent chip thickness is of vital importance when the depth-of-cut ap is in the same order or smaller than the nose radius r. Woxén made considerable simplifications in his chip area model, that form the basis for calculations of the equivalent chip thickness. Basic mathematical solutions, e.g. describing the chip area on circular inserts, are lacking. This article describes the geometrical implications when machining with round inserts. The error in Woxén’s equivalent chip thickness is largest when the depth-of-cut is less than ¼ of the nose radius. The calculations of the equivalent chip thickness based on the Woxén model are up to 50 % wrong, for some combinations of cutting data in the finishing range. The presented results explain the difficulties in getting a good validity in the models used to calculate tool life in finishing machining. The error leads to an underrating of the tool load in many machining situations.
Original languageEnglish
Number of pages7
Publication statusUnpublished - 2007
EventSwedish Production Symposium 2007 - Gothenburg, Göteborg, Sweden
Duration: 2007 Aug 282007 Aug 30
Conference number: 1


ConferenceSwedish Production Symposium 2007

Subject classification (UKÄ)

  • Materials Engineering


  • round inserts.
  • metal cutting
  • Woxén
  • equivalent chip thickness


Dive into the research topics of 'True equivalent chip thickness for tools with a nose radius'. Together they form a unique fingerprint.

Cite this