Geometrical instruments – Distance measuring – Single contact with a work engaging support
Patent
1987-04-09
1989-03-21
Cuchlinski, Jr., William A.
Geometrical instruments
Distance measuring
Single contact with a work engaging support
33561, G01B 322
Patent
active
048131512
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 movement relative thereto from a rest position to a displaced position when the stylus contacts the workpiece. Sensing means are provided for sensing workpiece contact by the stylus. The sensing means 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 Abstracts of Japan, vol. 9, No. 199, (P-380)[1922], 16th Aug. 1985; and JP-A-60 64 206, (TOUKIYOU SEIMITSU K.K.), 12-04-1985.
Archer Clifford W.
Hajdukiewicz Peter
Cuchlinski Jr. William A.
Renishaw plc
Scanlon Patrick R.
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