b'Shops that go the custom routeStar Cuttershould supply as much information as possible about their reaming ap-plication to the tooling company they select, said Gary McCarel, ap-plication engineer at Star Cutter.Carbide step reamers can meet precision For one thing, he and his colleaguesdiameter requirements.need to know the acceptable Cpk, or process capability index, for the application. specifications. He said the specified tolerance To maintain a Cpk of 1.667, whichWhen you rough a hole prior tofor positional deviation might be is pretty much standard in industry,a finished ream or a finished reamonly single-digit microns from the we lose a lot of our size toleranceand honing operation, that hole istop of a hole to the bottom.for the reamers finished diameter,not necessarily straight from topOther particulars needed by Star he said. A part print may say 13to bottom, McCarel said. So weCutter designers include an appli-m, but for us to run at a 1.667 Cpk,need to design a reamer that is notcations requirements for surface we can only use 6 m of that. Soonly going to maintain circularity,finish and cycle time. Shops should sizing is our first concern. roundness in size and finish but onebe aware that surface finish affects Makers of custom reamers alsothat will (accurately) cut its own po- the cycle time that a reamer can must have the applications positionsition, top to bottom. deliver. For example, McCarel said 10X HIGHER PRODUCTIVITY!XSYTIN\x1f360 CERAMIC END MILLSDelivers tremendous cost savings! High removal rates on a wide range of materialsFINALLY\x1f A SOLID CERAMIC END MILLCapable of signi\x1fcantly THAT OUTPERFORMS CARBIDE! increased chip loads versus other ceramic end millsA combination of our strongest ceramic material and a unique cutting geometryVisit greenleafcorporation.com for more information! World leader in ceramic cutting tools!Greenleaf Corporation is ISO 9001 Certified. Greenleaf Corporation | 18695 Greenleaf Drive | Saegertown, PA 16433 | 800-458-1850 | 814-763-2915 2021 Greenleaf Corporation [email protected] | www.greenleafcorporation.com Reaming.indd 25 8/17/21 3:05 PM'