Machine Calibration Accessories
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CMM1 Optical Polygon, manufactured by Hilger & Watts. Has twelve faces, 30 degrees apart in a horizontal plane. Used for calibrating dividing heads and coordinate measuring machines. On sale at another web site at $4200. Serial No. 200405; comes with calibration sheet signed in ink by QA manager of Webber Gage Division of Starrett dated 2/8/96. Greatest deviation is 1.6 seconds of arc. Stout custom-made polymer box. Price: SOLD
 

CMM2 Machine Checking Gauge, Type MCG1, still manufactured by Renishaw Metrology. For evaluating the calibration of coordinate measuring machines and machine tools under 35 cubic feet in capacity. Complete and unused in fitted mahogany case and with original instruction booklet as well as the original calibration sheets. Claimed accuracy is +/- 0.5 microns. Price: SOLD

CMM3 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. 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. Price: SOLD

CMM4 K & E Model 71-1130 mirror; for use with autocollimator to check the flatness of surface plates; mounts on height gage; no adapter furnished; in original box. Price: SOLD
 
 
 
 
 

Sq3 Veeko Squareness Gage, granite, Model VSQ-12, twelve inch stroke of stylus; Serial No.12259U. Price: SOLD