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and scanning data collection, at speeds of up to 1000 points per second. Styli are stored in an integral six-port changing rack, and the system is programmed through MODUS Equator software. The Equator can be used manually with push-button


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Booth #2314


ease, but EZ-IO software makes it well-suited for integration into automated cells like Conroe’s. “We attended an open house at Hartwig in early 2012 and saw the Equator in action, along with Okuma’s twin-spindle dual-gantry lathe,” said Wardell. “Apart from being automation-ready for parts of our type, the lathe’s Windows-based OSP dual-path control has an open- architecture, PC-based operating platform, which was important in our plan for developing our own auto-com- pensation software.” Wardell and Buck went on to install a cell consisting of the Okuma 2SP- 250H, a single Equator, an engraving machine, and a FANUC M20iA six-axis robot. In practice, the lathe’s two part carousels are loaded with about 300 raw workpieces. The lathe’s dual-gan- try loaders feed the spindles and place finished parts on a chute leading to a conveyor for pickup by the robot. The robot places the part on the Equator for measurement and, if acceptable, transfers it to the engraving machine, and finally boxes/palletizes the fin- ished parts. “We developed our own tool com- pensation software to run on the OSP control,” Wardell said. “This software uses measuring results from the Equa- tor, transmitted in the form of a CSV file, to offset the tools when the part deviates from tolerance.” Machining removes about 0.015" (0.38 mm) from each side of the part, with the tightest tolerance at ±0.001" (0.025 mm) and an 8 μin. (0.5- μm) surface finish. Parts range in size from 3 to 6" (76–152-mm) OD. “The Equator is easily able to measure within our tolerances with a high margin,” said Wardell. “Our OD/ ID stays spot on, with perhaps a couple of tenths variation on radius. We batch parts by size, so changeovers of chuck


48 ManufacturingEngineeringMedia.com | September 2013


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