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Ium cobalt chrome and (OVT, Columbia City, » OVT has saved approxistainless steel materials. IN). OVT manufactures mately $120,000 a year by OVT also works closely state-of-the-art, qualusing a digital comparator. with medical OEMs, ity cutting tools for » With traditional comoften at the design the orthopaedic and parators, it took two OVT phase with product industrial cutting tool operators approximately 20 engineers, to develop industry. Matt Dahms, minutes to change the lens. cutting geometries president of OVT, foundWith the new digital optical required for OEMs’ sured the company in 1996 comparator, lens changes are not required.

Because the eddy current induced in the surface only penetrates a few thousands of an inch, when the probe is inserted into a tapped hole, the eddy current follows the contour of the threads. In tapped holes, the analog output indicates the gap between the probe outside diameter, and what is essentially the pitch diameter of the threads. Source: Kaman Precision Products In addition to presence, inductive sensors can also be used to detect thread depth. Adding a long range displacement sensor such as an LVDT to the insertion mechanism provides insertion depth feedback.

Overlays are not well suited for quick turnover jobs and present a number of problems, which include the requirement to be physically stored and managed, repeatability challenges from operator to operator, including the possibility of generating errors due to operator subjectivity. In addition, overlays can be damaged, can only be used at a single magnification and require periodic re-calibration. The accuracy of optical comparators also is often insufficient to meet today’s ever-tighter tolerances.

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