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Apparatus for measuring positional movement of a numerically controlled machine tool

  • US 4,612,709 A
  • Filed: 07/09/1985
  • Issued: 09/23/1986
  • Est. Priority Date: 07/20/1984
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring positional movement of a movable workpiece of a machine tool, comprising:

  • (a) direct position measuring means, arranged along the path of movement of the movable workpiece;

    (b) indirect position measuring means, mechanically coupled to a drive of the movable workpiece and having a measuring resolution at least four times greater than the measuring resolution of said direct position measuring means; and

    (c) means for relating resulting measurement values of both position measuring means with each other and for automatically determining spindle pitch and spindle pitch error of a spindle coupled to the drive so that the control accuracy of the machine tool can be improved.

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