The second trend Petersen is seeing is his customer’s
desire to perform more measurements near the point of production. That means near or even on the machine tool cutting the parts. “They want shop-floor operators to make those measurements without waiting for the quality lab to make the mea- surements and send them back,” he said. “It saves time and provides a better product.” While the instruments they provide seem to fill the need for accuracy and repeatability, there is always the inconsistency that comes from human error. “You can have quite a difference in repeatability as a result of an operator,” he said. That is where the company’s new, highly portable zCat CMM comes in, using a program to perform measure- ments and taking the human element out of the equation. “It weighs 30 lbs and you can operate it on a desk, though it is better on a surface plate,” said Petersen. It measures to 4.0 + (L / 100 mm) microns when equipped with a Renishaw TP20 touch probe, accord- ing to its spec sheet. “What our medi- cal customers like about it is that they use it to measure parts near or even on the machining center, or in reverse engineering prototype parts created using a 3D printer,” said Fowler.
Video Comparison
Another company that is refining an old standby with new digital technol- ogy is Starrett Kinemetric Engineer- ing (Laguna Hills, CA), upgrading the venerable optical comparator with a digital version. “We replaced the old mylar overlays with digital profiles created from CAD files provided in .DXF format,” explained Mark Arenal, managing director for Starrett. The digital files include a tolerance band so that parts can be compared digitally with an image captured through a video
Half Pg Magnum Lathe Ad M.E._Layout 1 1/6/16 12:49 AM Page 1
camera. While available since about 2013, Arenal noted that the company recently introduced a “profile-fitting” capability that transforms the old go/no-go capability into a quantified whisker chart of deviations of the part along the profile. It is
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