Modern Machine Shop

MAY 2018

Modern Machine Shop is focused on all aspects of metalworking technology - Providing the new product technologies; process solutions; supplier listings; business management; networking; and event information that companies need to be competitive.

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Page 93 of 179

MMS MAY 2018 92 BETTER PRODUCTION CENTERLESS GRINDING Grooving • Turning • Boring • Threading • Parting Profiling • Form Tooling • Special Tooling • Face Grooving With over a million standard tools, we've got the "ings" covered. INTERNAL GROOVING INTERNAL FACE GROOVING INTERNAL THREADING EXTERNAL GROOVING EXTERNAL FACE GROOVING EXTERNAL THREADING BEARING SURFACE: Ground to 0.3149 ± 0.0001 inch BEARING SURFACE DRIVE SURFACE GRIND RELIEF: 0.03 inch wide (originally 0.015 inch) GRIND RELIEF MAIN DIAMETER: Ground to 0.3760 ± 0.0005 inch Widening the grind reliefs enabled the shop to finish the turned drive shaft on a centerless grinding machine rather than between centers. This made it easier and more cost effective to both achieve the listed tolerances and to maintain total indicator runout within 0.0002 inch. parts, singling out shafts that would both spin true and fit securely with bearings at either end. The newly formed Gizmotron LLC went through three different machining vendors for the shaft before Mr. Kipness found Profile Grinding Inc., a 20,000-square-foot, 32-employee contract machine shop near Cleveland, Ohio. The shop guided its new customer through a few minor design changes that made the part suitable for centerless grinding, a finishing process that elim- inated the vibration problem while keeping pro- duction cost-effective. "Not only did we provide

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