Adjustable ball bar gauge for coordinate measuring machine

Details Adjustable ball bar gauge for coordinate measuring machine Adjustable ball bar gauge for coordinate measuring machine

1987-05-11

1988-08-16

Tokar, Michael J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01L 2500

Patent

active

047635070

ABSTRACT:
An adjustable ball bar gauge is provided for use in testing the accuracy of the readings obtained in a coordinate measuring machine. Such a machine has a probe that contacts numerous points on an article arranged within its measuring envelope to produce signals that are used, through a computer, to map the shapes or dimensions of surfaces of the article. The ball bar is formed of an elongated shaft, having contact balls mounted upon its opposite ends, that is mounted upon a movable support which allows the bar to be positioned at variable height and vertically and horizontally angled positions. The ball bar support may be placed within the machine measuring envelope and its position, including its angularity, may be repeatedly changed so that the probe may successively contact both balls each time the ball bar position is changed to produce test readings from which the accuracy of the machine may be gauged. The ball support includes cooperating locating elements which are contacted by a probe to accurately locate the ball bar position within the machine envelope when the positions are changed.

REFERENCES:
patent: 4219934 (1980-09-01), Davitt, Jr.
patent: 4364182 (1982-12-01), Jones
patent: 4372721 (1983-02-01), Harjar et al.
patent: 4373267 (1983-02-01), Lycan
patent: 4523450 (1985-06-01), Herzog
Calvin and Haas, "Jigs and Fixtures", McGraw Hill Book Co., 239 W. 39th, NY, p. 143, 1913.

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