Socketed
Ball Bar Set, Standard Reference Material No. 2083, still available from
the National Institute for Standards & Technology (formerly National
Bureau of Standards) at $2580 list price. Complete and unused in fitted
wooden case.
Socketed
Ball Bar Set, Standard Reference Material No. 2083, still available from
the National Institute for Standards & Technology (formerly National
Bureau of Standards) at $2580 list price. Complete and unused in fitted
wooden case.
Price: SOLD
Used for checking the calibration of coordinate measuring machines. Accuracy dependent on thermal expansion of the steel rods and on the roundness of the balls, which originally was within +/- 0.5 micrometers (10 microinches); the roundness charts are no longer with the set, however. Bar lengths can be made up in 50 millimeter increments from 100 millimeters to 1650 millimeters.
Read on !
For details see
the NTIS web page at: http://ois.nist.gov/srmcatalog/certificates/images/srm2083_pg1.gif
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The
closeup image at left shows how the ball bar fits in a magnetized socket
at the table end and in another magnetized socket held in the spindle or
sensing head of the machine under test.
