US 2010/0250178 A1Published application

Corrected ball diameter calculating method and form measuring instrument

AssigneeMitutoyo Corporation

InventorsTakashi Noda, Hiromi Deguchi

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Abstract

A corrected ball diameter calculating method includes: 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 to calculate measured diameter values that are diameter values of a circle passing through the neighborhood of center points of the stylus tip; 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.

Claims6

Dependent claims

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.

7 more elements

A form measuring instrument, comprising:

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;
a moving mechanism configured to cause the probe to move;
a coordinate value sensor configured to detect the coordinate values of the probe;
a controller configure to control the rotary table and the moving mechanism to cause the stylus tip to touch the workpiece;
and
an analyzer configured to use detected values that are detected by each of the sensors when the stylus tip is caused to touch the workpiece by the controller and corrected ball diameters that are calculatory diameter values of the stylus tip to analyze the profile of the workpiece, the analyzer comprising:
a storage unit configured to store beforehand calibrated diameter values that is calculated per each height position by performing, with respect to 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 of the reference gauge at a plurality of different height positions from a bottom surface of the reference gauge;
a measured diameter value calculating unit configured 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 measurement site as a result of the stylus tip being caused to touch a plurality of measurement sites on the reference peripheral surface of the reference gauge at each of the height positions in a state where the reference gauge is placed on the rotary table and rotated;
a corrected ball diameter calculating unit configured to calculate 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;
and
an analyzing unit configured to use the corrected ball diameters to calculate the profile and the like of the workpiece.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/730,534Filed 24 Mar 2010
Priority: JP 2009-07357225 Mar 2009
Published: 30 Sep 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01B 21/042
By measuring coordinates of points: calibration or calibration artifacts
G01B 5/008
For measuring coordinates of points: using coordinate measuring machines
G01B 5/20
Measuring arrangements characterised by the use of mechanical techniques: for measuring contours or curvatures
G01B 5/201
For measuring contours or curvatures: for measuring roundness

Family

US 9,151,602 B2Related patent
US 2010/0250178 A1This patent

From the US filing history. Foreign family members aren’t listed.

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