×

CORRECTED BALL DIAMETER CALCULATING METHOD AND FORM MEASURING INSTRUMENT

  • US 20100250178A1
  • Filed: 03/24/2010
  • Published: 09/30/2010
  • Est. Priority Date: 03/25/2009
  • Status: Active Grant
First Claim
Patent Images

1. A corrected ball diameter calculating method for use in a form measuring instrument, the form measuring instrument including:

  • a rotary table rotatably disposed and adapted an workpiece to be placed;

    a rotation angle sensor configured to detect the rotation angle of the rotary table;

    a probe including a stylus tip; and

    a coordinate value sensor configured to detect the coordinate values of the probe, the corrected ball diameter calculating method comprising;

    preparing a reference gauge that has at least one reference peripheral surface of an outer peripheral surface and an inner peripheral surface;

    valuing of diameter values of the reference peripheral surface at a plurality of different height positions from a bottom surface of the reference gauge;

    calculating calibrated diameter values per each of the height positions;

    placing the reference gauge on the rotary table and causing the stylus tip to touch a plurality of measurement sites on the reference peripheral surface at each of the height positions in a state where the reference gauge is caused to rotate by driving the rotary table, to calculate, per each of the height positions, measured diameter values that are diameter values of a circle passing through the neighborhood of center points of the stylus tip when the stylus tip has touched each of the measurement sites; and

    calculating the corrected ball diameters per each of the height positions from the calibrated diameter values and the measured diameter values that are calculated per each of the height positions.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×