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Cutting performance of laser assisted diamond turning of calcium
 fluoride with different crystal orientations

Single point diamond turning of single crystal
 CaF2 using the µ-LAM process is studied.
 We focus on how crystal orientation of the workpiece can influence tool
 wear and efficiency of the cutting process. Cutting experiments were
 performed on single crystal CaF2 with
 ⟨100⟩, ⟨111⟩, and ⟨211⟩ crystal orientations. The tool failed at the
 smallest cutting distance for ⟨111⟩ crystal orientation, whereas tool
 failure on ⟨100⟩ orientation occurred at the longest cutting length. Tool
 life for cutting ⟨211⟩ and ⟨111⟩ crystal orientations was found to be 92%
 and 67%, respectively, of that of tool life during cutting ⟨100⟩
 orientation. To explain the results obtained, an anisotropic model based
 on Schmid’s law was used. It is shown that an inverse correlation between
 the resistance to plastic deformation and maximum cutting distance without
 inducing any brittle fracture can be established.