SURFACE METROLOGY


The TopMap Pro.Surf, a precision, noncontact topography measurement system designed for surface characterization of precision mechanical components, incorporates a traceably calibrated scanning white-light interferometer.


areal surface maps to about 2 µm of resolution, accord- ing to Erik Novak, director of business development for the company. This is not enough resolution for the typical roughness calculation. “Instead, what it is doing is replac- ing a visual check, scribe, or even a ‘calibrated fi ngernail’,” he explained. “It measures and calculates defects such as pitting, scratches, dents, or nicks and determines if they are functional or cosmetic. A feature that is 50-µm deep might lead to a high prevalence of corrosion on a turbine blade, for example.” Novak related that aerospace and stationary power turbine blades are a particularly useful application of the technique. If it does not calculate the standard roughness parameters,


like Ra, how does the operator know if a part is out of spec? “Most companies have specs on their drawings about surface


defects, their prevalence, and depth and we can input that di- rectly into the device,” he said. Advanced uses include mount- ing the device on a robot for 100% inspection and exporting data for use in a company’s part lifeing models. He also pointed out that having this level of data is some- times having an impact on upstream engineering. “Many of the specs companies use are guesswork; now one can


74 AdvancedManufacturing.org | June 2017


measure [these defects] and then observe the actual lifetime of the component,” he said.


What makes this hand-held gage particularly useful in a


shop-fl oor setting is that it is not a scanning device. Data is taken instantaneously by exploiting linear polarization fi lters mounted on the camera. It takes a single digital camera image to extract its depth map. The single image capture makes it insensitive to noise and vibration, so it is both rug- ged and fl exible, according to the company.


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4D Technology 800-261-6640 / www.4dtechnology.com


Keyence Corporation of America 888-539-3623 / www.keyence.com


Mahr Federal


401-784-3100 / http://www.mahr.com Polytec


949-943-3033 / www.polytec.com/us Q-DAS


248-299-4910 / http://www.q-das.com/en Zygo


800-994-6669 / www.zygo.com


Photo courtesy Polytec


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