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Mounting for surface-sensing stylus and a method of using said mounting

  • US 5,088,046 A
  • Filed: 07/28/1989
  • Issued: 02/11/1992
  • Est. Priority Date: 12/19/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for use on a coordinate positioning machine in measuring a surface, the machine having a head movable relative to a table on which said surface is supported, the apparatus comprising:

  • a base connectable to the head;

    a first rotor supporting a surface-sensing device, the first rotor being mounted to, and for rotation relative to the base about a first axis;

    a first motor for rotating the first rotor about said first axis in response to an input signal;

    first transducing means for measuring, relative to a reference orientation, an angle of rotation of the first rotor about the first axis; and

    first controlling means for providing;

    (a) a torque input signal or operating said first motor to apply a constant torque to said first rotor; and

    b) a positioning input signal for operating said first motor to position said first rotor at a given angle of rotating relative to said reference orientation,wherein said first controlling means is selectively operable for passing on of said torque input signal and said positioning input signal to the motor as said input signal.

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