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Golfer
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Newbie

Joined: 09 July 2010
Location: United States
Posts: 1

Posted: 09 July 2010 at 12:47pm \| IP Logged

Can someone help with this question? We have a system that is using V.D 4.0 and we're trying to calibrate some star probes at different angles & positions.

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angel3327279
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Joined: 27 July 2010
Posts: 10

Posted: 28 July 2010 at 1:52am \| IP Logged

The first consideration is to determine what diameter should the master calibration sphere be?
On most modern C.M.M.'s the probe fitting software will accept almost any diameter spherical master. The most common master spheres have been one inch, ( 1.00", 25.4 mm ), and three quarters of an inch, ( 3/4", 0.75", 19.05 mm ); but 28 mm (1.102 inches) and 30 mm (1.181 inches) diameter have become more popular as C.M.M. technology has taken on a more European focus.
The more popular sizes of master calibration spheres are less expensive. Changing the master calibration sphere diameter will not compromise the C.M.M.'s performance in any way.ghd mk4
When using very small diameter spherical contacts on the measuring probe, choose much smaller diameter master calibration spheres to accurately characterize these small diameter contacts. The three most popular diameters for the master calibration spheres for smaller diameter probes are 4 mm ( 0.157 inch ), 6 mm (0.236 inch ) and 10 mm ( 0.3937 inch ). The smaller diameter master spheres are used to calibrate the smallest probe spheres and so on with the larger diameters. The problem of serious wear of the small diameter master spheres, due to the high contact force, makes it almost mandatory that these small diameter spheres be made of tungsten carbide. This is a necessary compromise because there will be some built in error due to the high stiffness of the T.C. material.gucci handbags

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