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Screw cutting machine

  • US 5,076,744 A
  • Filed: 09/10/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 09/28/1989
  • Status: Expired due to Term
First Claim
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1. A screw cutting machine comprising:

  • a table mounting a work thereon;

    a rotary cutter spindle exchangeably carrying any selected one of screw cutting tools extending in a perpendicular direction relative to a longitudinal axis of said spindle;

    a table feed drive apparatus for feeding said work table with positional control thereof in two mutually perpendicular directions (X, Y);

    a spindle drive apparatus capable of rotary driving said spindle at a relatively slow speed and with control of a rotational phase (θ

    ) thereof;

    an axial feed drive apparatus for feeding said spindle in an axial direction (Z) with positional control thereof toward said work; and

    a numerical control apparatus for driving said work table in a complete circle about the axis of said spindle while keeping said screw cutting tool in contact with an internal or external surface of the work and while keeping a preselected limit of cutting depth for a complete revolution of said spindle, and for allowing said rotary spindle at the same time to move axially thereof in a length corresponding to a predetermined screw pitch to be machined and in synchronism with said full circle ratational movement of said spindle.

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