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part, are also useful. However, air gages can only bridge a maximum gap of ±40 µm, so if part size changes the gage ring must be replaced. Automatic feedback control allows post-process gaging to develop the process over time; if, for example, ambient temperature rises, the gages instruct the CNC to compensate for temperature growth, or for diamond wear on the wheel.” Glebar uses both laser and contact gaging: in-line, continuous-fl ow laser measurement for through-feed, and contact gages for plunge. “Contact gages are typically accurate to 0.1 µm, and laser is even better than that,” said Gleason.


He added that Glebar developed a patent-pending process that measures more than part diameter; the process feeds back the entire geometric profi le of a part to the machine, automatically correcting the wheel dress profi le. “In typical centerless grinding, only the diameters are measured,” Gleason said. “But that doesn’t take into account the actual shape of the part, which could include tapers. The P4K, an offl ine Glebar metrology system, feeds back part geometry to grinder, then the grinder corrects the wheel dress shape for the actual part profi le. It’s faster and more accurate than a more traditional way of doing things — you’re trading setup time for production time.”


One of the issues with laser gaging is that the part must be cleaned of coolant and debris prior to measurement. However, TGS uses an in-process automatic blow-off, such as an air knife or an air tunnel, to remove coolant from the part so it can be laser gaged. “You can also set fi lters on a laser gage to ignore some of the impurities,” said Giacalone. “I would say 80 percent of our machines have some kinds of in process or post


process gages. Lagun’s centerless grinders also use in-line laser measurement systems (with part cleaning systems) to ensure tolerances. Part size determines the correct system to use, according to Garvey.


Having issues with your finishing process?


For over 60 years, Rosler has produced high-quality ceramic media, plastic media and finishing compounds. Rosler offers over 8,000 different types of consumables for use in every conceivable mass finishing application. If you are having issues with your finishing process, send us your parts and we will process them in one of our test labs, helping you find a better process.


finding a better way...


Rosler Metal Finishing USA is the leader in mass finishing, shot blasting, automated processes and media - made in the USA. Visit www.rosler.us or call 269-441-3000 for more information.


June 2017 | AdvancedManufacturing.org 57


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