Measuring and testing – Inspecting
Patent
1992-07-01
1993-07-20
Williams, Hezrone E.
Measuring and testing
Inspecting
33558, 33561, G01M 1900, G01B 322, G01B 500
Patent
active
052283526
ABSTRACT:
A touch trigger probe for machine tools or coordinate measuring machines has three strain gauges 10A-C, which respond to deflection of a stylus of the probe when it contacts a workpiece. The signals from the strain gauges are each rectified by precision rectifiers 18A-C, and then combined at a summing junction 20. A first comparator 28 compares the combined signal with a threshold voltage V.sub.ref1, to produce a sensitive trigger signal. A second comparator 30 compares the combined signal with a higher threshold voltage V.sub.ref2, which produces a confirmation signal. This confirms that the trigger signal is caused by a genuine workpiece contact, and not caused falsely by vibration or acceleration.
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Patent Abstracts of Japan, vol. 8, No. 105 (p-274) (1542) 17 May 1984 & JP-A-59 015 804 (Mitsutoyo Seisakusho K.K.) 26 Jan. 1984.
Archer Clifford W.
McMurtry David R.
Dombroske George M.
Renishaw Metrology Limited
Williams Hezrone E.
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