Geometrical instruments – Gauge – With calibration device or gauge for nuclear reactor element
Patent
1993-07-12
1995-07-11
Wirthlin, Alvin
Geometrical instruments
Gauge
With calibration device or gauge for nuclear reactor element
33503, G01B 7008
Patent
active
054309484
ABSTRACT:
A method and apparatus for certifying a coordinate measuring machine includes a certified ballbar, having a pair of spherical surfaces connected with a bar and having certified diameters separated by a certified distance, that is positioned with a positioning device. The positioning device includes a bar support that supports the ballbar at a midpoint of the bar between the balls, wherein the ballbar is supported free of attachment to the balls. The positioning device includes a first rotational assembly for rotatably supporting the ball support for rotation motion about a horizontal axis and a second rotational assembly for rotatably supporting the bar support about a vertical axis. The first rotational assembly provides rotation of the bar support in a clockwise direction to position the ballbar in a first set of angular orientations and in a counterclockwise direction to position the ballbar in a second set of angular orientations. The second rotational assembly provides rotation of the bar support in substantially a complete revolution.
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