Rotary table for a coordinate measuring machine and method...

Details Rotary table for a coordinate measuring machine and method... Rotary table for a coordinate measuring machine and method...

G - Physics

08

C

33/112, 340/135.

G08C 21/00 (2006.01) G01B 5/00 (2006.01)

Patent

CA 2011777

ROTARY TABLE FOR A COORDINATE MEASURING MACHINE AND METHOD OF DETERMINING THE AXIS OF TABLE ROTATION ABSTRACT A rotary workpiece support table (12) for a horizontal arm coordinate measuring machine (10) having a retractable datum ball (144) for determining the axis of rotation of a table top plate (36) on a table base (40). A frictional drive mechanism (38) has a drive wheel (72) urged into engagement with a perimeter surface (74) and rotates the table top plate (36), with a counterforce roller (98) neutralizing the side loading on an air spindle (116). The table base (40) is positioned on a machine base (30) and spacer (32) by a rotational connection (46) and a diametrically opposite block and cam follower connection (48) to avoid the effects of differential thermal expansion between the table base (40) and the machine base (30) and spacer (32). (FIGURE 2)

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