Probe for measuring workpieces

Details Probe for measuring workpieces Probe for measuring workpieces

1989-01-11

1990-06-19

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

Single contact with a work engaging support

33561, G01B 322

Patent

active

049340654

ABSTRACT:
A contact-sensing probe for measuring workpieces includes a body (16) for attachment to a machine and a workpiece contacting stylus (22) carried by a stylus holder (24) which is mounted within the body for movmeent relative thereto from a rest position to a displaced position when the stylus contacts the workpiece. Sensors are provided for sensing workpiece contact by the stylus. The sensors comprise a plurality of strain gauges (46) mounted on pillars (44) connecting two parts (36A,36B) of a support structure which supports the stylus holder on the body. The strain gauges are mounted with their principal axes lying at an angle to the axes of the pillars, and by optimizing the numbers, positions and dimensions of the pillars together with the angles of the strain gauges, high sensitivity can be achieved with minimum risk of false signals due to probe vibration, while at the same time minimizing the variation in pre-travel of the stylus.

REFERENCES:
patent: 4339714 (1982-07-01), Ellis
patent: 4443946 (1984-04-01), McMurtry
patent: 4451988 (1984-06-01), McMurtry
patent: 4462162 (1984-07-01), McMurtry
patent: 4578873 (1986-04-01), Klingler et al.
patent: 4625417 (1986-12-01), Cusack
patent: 4813151 (1989-03-01), Hajdukiewicz et al.
Patent Abstract, vol. 9, No. 199 (p-380)[1922] 8/16/85.

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