MEDICAL METROLOGY Starret Kinemetric Engineering Horizontal Digital Video Comparator
are detected on a wide range of surfaces and materials. These include matte to gloss surface finish and plastics to metals. Knee implants and other devices where surfaces free of inflections and defects are critical would be an ideal ap- plication. “It does not measure surface roughness so much as it analyzes the entire surface for abnormalities,” explained Bauza. The intent is to remove variance in today’s human inspection while dramatically improving consistency of judg- ment and throughput all in a manufacturing environment enabling 100% inspection.
The Equator Another production intent metrology device is the Equator gauging system from Renishaw (Hoffman Estates, IL). Unique since its introduction in 2012, it “looks and feels like a CMM, since it drives a little stylus around,” explained Dave Emmett, business manager, Gauging Products. However in reality it
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is a high-speed comparative gauge for inspection of high-volume manufactured parts. “We do metrology based on the hard gauging technique of the master measure process,” said Em- mett, “it takes a little preparation, but is well worth it in a production setting.” Its parallel kinematic machine design allows for high-speed scanning and rapid moves between features, while retaining stiffness. “In the medical industry, there are a number of ideal applications that are currently using the Equator,” said Emmett. One such application is measuring bone screws, since they are made in high volume, are uniform in size and shape, and have unique and var- ied precision features. Another are the components within X-ray and CT scanning machines that are becoming more popular, as previously noted. “They want more resolution out of the detectors,” he said, which means finer, even more precise parts. Measuring syringes today is particularly interesting. Now that the medical community is starting to use these as automatic and mobile means for delivering controlled dosages, small sizes and extremely tight tolerances go hand in hand. “Maintaining the repeat- ability of the swept volume of the syringe is extremely important. It may only be a one millimeter stroke, but if you vary by even a couple of microns, that could be quite detrimental to the patient,” he said. The Equator is capable of repeatable measurements from a mas- ter to ±2 μm. “It is often capable of even more. We have had gauge R&R studies that exceed that specification on well-formed diameters,” he said.
? Exact Metrology 866-722-2600 /
exactmetrology.com
Fowler High Precision 800-788-2353 /
fowlerprecision.com Jesse Garant
855-962-5300 /
jgarantmc.com Nikon Metrology
810-220-4360 /
nikonmetrology.com/ en_US/
Renishaw Inc. 847-286-9953 /
renishaw.com
Starrett Kinemetric 949-348-1213 /
starrett.com
Carl Zeiss Industrial Metrology, LLC 800-327-9735 /
zeiss.com/metrology
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