MEASUREMENT
by contact measurements. These are applications that typically need to be measured to less than 20 μm, which only probes can deliver,” Nemitz said. Noncontact systems, on the other hand, typically have accuracies of 50 μm or greater, but are ideal for nonprismatic or organic shapes. “Wing spans, plastic parts, leading and trailing edges, turbine blades— parts that need a lot of data to defi ne them are ideal for noncontact measurement,” he said.
New Technologies, Faster Collection
Projection back onto parts of the results of measurements from fringe projection optical scanners, as compared to CAD, is useful in a number of aerospace operations.
While noncontact has its advantages, so too do traditional touch trigger or scanning analog probes. It is all about accuracy and shape. “Prismatic features—circles, holes, slots, plain line points—have very tight tolerances and are generally best served
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Another key element is speed. Everyone wants to make measurements more automated and noncontact techniques typically provide high data rates, up to millions of points per second. White light systems, while fast and accurate, have some disadvan- tages, such as the need to coat parts and deal with refl ective surfaces. To alleviate some of these issues, API has introduced its RapidScan optical scanning device featuring infrared light rather than visible. Surfaces are less re- fl ective in the longer IR wavelength and less susceptible to ambient light. Nemitz also noted that API’s Rap- idScan system uses a camera with a higher dynamic range than is typical, 50% higher db. “This allows us to take a highly refl ective part and capture more intensity,” he said. “For example, with a lower db system, the refl ectivity will bleed out the points and you will get zero data. The higher db system will capture data.” This provides an additional advantage, the ability to vary the resolution. “With that, we can accurately extract prismatic shapes embedded in organic shapes, like holes and critical edge profi les,” he said. With speed balanced with accuracy so important, other metrology provid- ers, such as Hexagon Manufacturing Intelligence (North Kingstown, RI), are taking a fresh look at CMMs. “A good example of this is the Global Advantage HTA, designed specifi cally for fast aero engine blade measurements,” said Joel Martin, laser tracker product manager, Hexagon Manufacturing Intelligence.
Made in Marshall, MO
Image courtesy Hexagon
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