The system exploits X-rays for metrology, with recent improve- ments in measuring volume and combining data scans that he believes benefi ts medical molding. For ultra-precise, small medical parts where tolerances are ≤ 5 µm (0.0002"), he recommends the Micura CMM outfi tted with a VAST XTR scanning analogue probe that provides a 4th axis. It boasts a maximum permissible error of MPEE = 0.8 +L/400 (µm). Finally, for shop- fl oor use, he recommends the Zeiss O- Inspect. “It offers the ability to combine inspection tasks,” he explained. “A white-light sensor is used for measuring clear materials. Blue and red lighting combined with backlighting is used for high contrast needs and tactile scan- ning for optimum accuracy.” Jamie Murray, senior applications engineer at Optical Gaging Products (OGP; Rochester, NY) also notes that a vision-based system tends to be the most popular with their biomedical device customers. OGP’s SmartScope family includes three lines of multisensor vision systems—Flash, ZIP, and Quest. Each product line features an optical system and optional sensors to serve a range of part and feature sizes, with appropriate accuracy and precision. SmartScope Quest is a popular solution for medi- cal devices, according to Murray. “The TeleStar optical system is fully telecentric throughout its range which is critical for high accuracy on many types of medical parts.” What attracts biomedical device manufacturers is the range of sensors available on the Quest, including conven- tional touch trigger probe, scanning ana- logue probe and the patented TeleStar- Plus interferometric TTL laser. Quest also offers a range of micro-probe options for measuring very, very small features. Measuring envelopes for the Quest family start at 300 × 300 × 250 mm with ac- curacies of (1.5 +5L/1000) µm.
Murray also reports that the combination of fully telecentric optics and a high-performance interferometric laser are ideal for measuring biomedical devices. “Medical implants tend to be rounded and shiny—characteristics that make them diffi cult to
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