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the telecentric setup allows for characterization of surfaces recessed by up to 70 mm without missing edge information in the entire fi eld of view,” said Lakshmipathy. “What sets this apart from stylus collected data is that you can actually see the surface as a 2D image. The feedback is so instantaneous that the operator can go back and change his feed blade or change the way he’s checking the part on the machine he is operating,” said Lakshmipathy. Zygo (Middlefi eld, CT) is another, well-


known, provider of optical surface mea- surement devices that exploit white light or coherent scanning interferometry, or CSI. According to Mike Schmidt, market development manager for the company, Zygo uses the same principles as other white light systems, refl ecting light off of a sample’s surface and recombining this light with that of a reference surface in a microscope objective thereby produc- ing interference fringes. When combined with a moving axis, typically normal to the surface under test, it scans the surface producing a representation of the surface with sub-nanometer vertical resolution. Included software allows for extraction of a number of features, such as surface texture, step height, and even some GD&T by using its vision capabilities. A driver for the growing use of their


interferometry systems was the stringent fuel effi ciency requirements, especially in Europe. “We started becoming more involved in automotive metrology in the early '90s,” he explained. “Especially in diesels that operate at very high pres- sures. A lot of the diesel injectors can no longer have any type of a gasket be- tween metal sealing surfaces. They have to manufacture these parts extremely smooth and extremely fl at,” he said. For a variety of reasons, including not wishing to damage the surface, the stylus measurement was supplanted by


non-contact methods such as coherent scanning interferom- etry. It is applications like this where the white light systems are best used, according to Schmidt, where noncontact, high accuracy, and high speed are required. He is also seeing some


Many applications today require special designs – Leistritz excels at providing customized solutions that may be difficult to achieve with standard tools. Our decades of experience solving machining problems is now available to manufacturers seeking greater productivity particularly in Aerospace, Automotive and Medical Fields. Leistritz tools are designed to fit any spindle in any machine.


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(201) 934-8262 ɡ www.leistritzcorp.com ɡ staff@leistritzcorp.com


Leistritz Advanced Technologies Corp. 165 Chestnut Street, Allendale, NJ 07401


June 2016 | AdvancedManufacturing.org 71


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