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Telescoping magnetic ball bar test gage

  • US 4,435,905 A
  • Filed: 03/15/1982
  • Issued: 03/13/1984
  • Est. Priority Date: 03/15/1982
  • Status: Expired due to Term
First Claim
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1. A test gage for determining the accuracy of an associated machine having a servo drive, which comprises:

  • a first gage ball;

    a second gage ball;

    telescoping holding means for maintaining said first gage ball and said second gage ball in a relationship allowing relative radial motional freedom while not allowing relative lateral motional freedom;

    a first means for securing said first gage ball so that the center of said first gage ball is maintained at a fixed location with respect to an associated machine;

    a second means for securing said second gage ball so that the center of said second gage ball is directed by an associated machine to execute a prescribed trajectory, all points of which are equidistant from the center of said first gage ball; and

    means for determining changes in the radial distance between the center of said first gage ball and the center of said second gage ball, whereby error in the execution of the directed trajectory is detected and the accuracy of an associated machine is determined.

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