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March 18, 2005 01:00 AM

CAT scanner targets small, complex parts

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    Bolton Works LLC is pitching CAT scan technology for inspecting and analyzing very small injection molded plastic parts and assemblies with complex geometries.

    Industrial CAT scanners rotate an object under a stationary X-ray. A detector measures the attenuation of the X-ray beams after they pass through the object. The measurements are reconstructed into a cross-sectional digital image.

    There is no need to program a CAT scanner, as opposed to a coordinate-measuring machine. Both the inside and outside of the part is captured, so porosity and other unintended voids show up.

    The Vernon, Conn., company presented a case study of a part for Parker Hannifin's Pneutronics division. Parker Hannifin wanted a nondestructive way to analyze a valve, which included a glass-filled-polymer valve housing, a stainless-steel core and actuator and a plunger with a silicone rubber seal.

    Bolton Works brings together virtual assembly, using scanned components, and computer-aided-design models to solve design and manufacturing problems at an early stage. A key to the process is PolyWorks software from InnovMetric, which compares dimensions to a CAD model and displays the deviations.

    Because the stainless steel, rubber and plastics, and copper wire all have a different density, the CT-scanner had to use different energy levels for each component. So Bolton Works did a “virtual assembly” with PolyWorks to put the components together into a final image.

    Tel. (860) 646-3948, fax (860) 646-9006, e-mail [email protected]

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