Apparatus for three-wire method of thread pitch diameter measure

Details Apparatus for three-wire method of thread pitch diameter measure Apparatus for three-wire method of thread pitch diameter measure

1983-05-02

1984-11-06

Haroian, Harry N.

Geometrical instruments

Gauge

Screw thread

33147M, G01B 340

Patent

active

044803885

ABSTRACT:
A holder for use in a three-wire measurement of thread pitch diameter comprises a pair of holder elements for holding respective ones of the three wires. The holder elements are generally rectangular in shape and are relatively movable toward and away from each other in a straight line in the direction of the diameter across which the measurement is being taken. The holder elements support measuring wires in parallel planes diametrically on opposite sides of the thread. Each holder element is provided with a central aperture providing access to the wires at their points of contact with the thread so that a micrometer measurement across the three wires is obtained. The pitch diameter is calculated from the micrometer measurement and the diameter of the wires.

REFERENCES:
patent: 2939220 (1960-06-01), Croshier et al.

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