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Apparatus for confirming movement of tap when rigid tapping

  • US 5,062,744 A
  • Filed: 03/26/1990
  • Issued: 11/05/1991
  • Est. Priority Date: 08/03/1988
  • Status: Expired due to Fees
First Claim
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1. An apparatus for confirming movement of a tap when rigid tapping with a machine tool having a built-in spindle motor for directly driving a spindle to rotate and a Z-axis motor for driving the spindle to move linearly along an axis of the spindle, comprising:

  • a detecting means for detecting a rotation of said spindle;

    a spindle control means for outputting a signal to control a rotation of said spindle motor according to a signal output from said detecting means;

    a Z-axis control means for outputting a signal to control a rotation of said Z-axis motor;

    a synchronous control means for outputting each synchronous signal to said spindle control means and said Z-axis control means, respectively; and

    a judgement means for judging a follow-up ability of said spindle motor, by comparing a prescribed reference signal with a signal of a rotational error of said spindle calculated by said spindle control means, using the synchronous signal from said synchronous control means and the signal from said detecting means.

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