Probe for sensing contact via acceleration

Details Probe for sensing contact via acceleration Probe for sensing contact via acceleration

1987-04-12

1988-11-01

Martin, Jr., William D.

Geometrical instruments

Gauge

Pivoted probes

33503, G01B 728

Patent

active

047809639

ABSTRACT:
A contact sensing probe is disclosed for use with a measuring machine or machine tool for measuring the dimensions of a workpiece. The probe comprises a housing within which a stylus holder is mounted on a kinematic support. A spring urges the stylus holder into a rest position on the support and yieldingly resists tilting or lifting of the stylus holder from the support when the stylus engages a workpiece. A sensing device in the form of an accelerometer is supported within the housing on the stylus holder to sense one of the effects of stylus engagement with the workpiece, and to produce a signal which is used to stop the machine and read the signal and read the coordinates of the instantaneous stylus position. The effects sensed in different embodiments of the invention are, sudden lifting of the stylus holder due to physical displacement of the stylus, or the shockwave produced in the stylus on contact with the workpiece. A piezo-electric pressure transducer is used as a sensitive accelerometer for measuring the shock wave in a preferred embodiment.

REFERENCES:
patent: 3945124 (1976-03-01), Jacoby et al.
patent: 4177568 (1979-12-01), Werner et al.
patent: 4294121 (1981-10-01), Inoue
patent: 4333238 (1982-06-01), McMurtry
patent: 4364180 (1982-12-01), Willhelm et al.
patent: 4702013 (1987-10-01), McMurtry
"Data Sheet TP2", Renishaw, Apr., 1984.
Patents Abstracts of Japan, vol. 7, No. 192, (P-218) (1337), 8/23/83.
Patents Abstracts of Japan, vol. 7, No. 156, (P-209) (1361), 7/8/83.

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