Geometrical instruments – Gauge – With calibration device or gauge for nuclear reactor element
Patent
1997-10-24
2000-02-15
Bennett, G. Bradley
Geometrical instruments
Gauge
With calibration device or gauge for nuclear reactor element
G01B 300
Patent
active
06023850&
ABSTRACT:
An apparatus for the checking of coordinate measuring machines and machine tools is described. The apparatus is a low cost and low weight ball cube with balls that can be probed with three probe styli each (with probing points distributed over more than a hemisphere in each case), the probe styli directed normal to five different cube sides. These properties are obtained by giving the balls an offset from the cube. The increased susceptibility to structural instabilities by the low weight design (e.g. plate structure) in connection with the offset balls is compensated by the use of corner connectors for the cube-edges to mount the balls on. The measurements on the ball cube yield--after evaluation--the linear approximations of the parametric errors of Cartesian axes machines: three errors of position, three errors of squareness, three roll errors, three yaw errors, and three pitch errors. The cube is as well a suited object to measure the errors of rotary tables of coordinate measuring machines and machine tools in situ. The calibration of the cube is performed by a length comparison between a calibrated reference ball bar and the ball distances along the 12 edges and the 12 diagonals of the 6 cube sides. This comparison is carried out with a self centring device.
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patent: 5269067 (1993-12-01), Waeldele et al.
patent: 5313410 (1994-05-01), Watts
patent: 5813128 (1998-09-01), Bailey
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