against NIST-certifi ed artifacts the same as for CMMs. For on- machine probing, Renishaw offers its RMP 60 and RMP 600 for large, gantry-style machining centers. These offer repeat- abilities of 0.25 and 1.0 µm respectively. Its AXISET software establishes and re-establishes datums and centers of rotation for rotary axes as temperatures change during fabrication. A newer product especially targeting critical jet engine blades is Renishaw’s OSP60 SPRINT high-speed scanning analog probe for use on machine tools. The sensor resolution is 0.1 µm and the probe is capable of delivering 1000 points per second over its infrared transmission link. The head itself can travel at 15 m/min while taking data.
“On these large CNC machines, aircraft manufacturers have developed some clever
techniques to re-establish datums and perform metrology checks on the parts.”
Renishaw also recognized that a complete solution is more than just the probe. The Blade Toolkit solution is software integrated with the SPRINT probe to help manufacturers specifi - cally machine blades, blade tips, and blend roots of bladed disks, according to the company. “Jet engine blades can have long machining cycles, 20–30 hours,” explained Somerville, “making a mistake can be very expensive.” The Blade Toolkit not only helps with original blades, but also helps repair blades that may no longer have a CAD model associated with them. The software ex- trapolates where the machining surface
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needs to be, providing data to the CNC controller to provide an optimum blend, said Somerville.
While accuracy is important, speed of measurement is also an issue when using probes on a precision CNC
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EMUGE-Gas-and-oil-ME_HIsl_qr.indd 1
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