V-groove shape measuring method and apparatus by using rotary table
AssigneeMitutoyo Corporation
InventorsTakashi Noda, Hiromi Deguchi, Katsuyuki Ogura
Life of this patent
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Abstract
By combining measuring element direction constant control, rotary table radius constant scanning control, and two-flank contact control, V-groove rotary table scanning control is performed to cause the measuring element of the scanning probe to contact always with two flanks composing the V-groove of the object to be measured, so that it is possible to measure accurately the characteristic values such as pitch deviation and axial runout of side face of male threads set up and fixed on a rotary table or screw hole of the object put on the rotary table.
Claims21
A measuring method of V-groove shape for scanning and measuring a V-groove of an object to be measured by using a scanning probe for measuring position, while rotating the object by a rotary table, with the object having a spiral V-groove fixed on said rotary table, comprising:
- controlling a measuring element direction by aiming at keeping constant a vector projected on a table plane of the rotary table of a direction vector from origin of the object to the measuring element of the scanning probe as seen from a machine coordinate system;
- controlling a rotary table radius constant scanning of which a confinement plane is a cylindrical plane;
- and
- controlling a two-flank contact scanning for causing said measuring element to contact with two flanks for composing said V-groove,
- wherein a V-groove rotary table scanning control is performed while keeping said measuring element always in contact with the two flanks for composing the V-groove.
A measuring method of V-groove shape, by fixing an object to be measured forming a spiral V-groove on a rotary table, in the case of scanning measurement of the V-groove by using a scanning probe for measuring position while rotating the rotary table, if the central axis of the object and the central axis of the rotary table are matched within a specified allowable range, comprising:
- controlling a two-flank scanning for causing a measuring element of the scanning probe to contact with two flanks composing the V-groove;
- and
- controlling a pitch scanning for moving the measuring element in a central axis direction at a speed determined on the basis of the pitch of the V-groove and the rotating speed of the rotary table,
- wherein a V-groove rotary table scanning control, while keeping the measuring element always in contact with the two flanks for composing the V-groove, is executed.
A measuring apparatus of V-groove shape comprising:
- a rotary table fixing an object to be measured forming a spiral V-groove,
- a scanning probe having a measuring element engaged with surface of the object,
- a drive mechanism for moving the scanning probe along the surface of the object,
- position detecting means for detecting position of the scanning probe, and
- control means for controlling moving speed of the scanning probe and rotating speed of the rotary table so that the measuring element may always contact with two flanks for composing the V-groove, wherein the control means performs a measuring element direction constant control aiming at keeping constant a vector projected on a table plane of the rotary table of a direction vector from the origin of the object to the measuring element of the scanning probe as seen from a machine coordinate system.
Dependencies are inferred from the claim text.