END MILLS - Fastcut Tool

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RESHARPENING RUFF-N-TOUCH ® END MILLSRuff-N-Touch end mills can be resharpened bytwo methods:1) Grinding the Radial Relief Angle – This is theeasiest method and, while it will reduce the depthof the chipbreakers, it is satisfactory in manyinstances, as the end mill will function with up to a60% reduction in chipbreaker depth. The radialclearance angle must also be resharpened in orderto maintain the correct radial land width.A tooth rest, placed on the cutting face at apoint deeper than the chipbreaker, must beused to properly orient the cutting edge to thegrinding wheel.2) Grinding the Radial Relief Angle and the CuttingFace – This method will retain a greater chipbreakerdepth for the life of the tool than just grinding theradial relief angle. The end mill will function with upto a 40% reduction in tooth width. When grindingthe face, dress the wheel to match the form fromthe OD to the fillet. The grinding head should beturned to an angle slightly greater than the helixangle of the end mill (1° to 3° extra). This allows theleading edge of the wheel to hollow grind the cuttingface. A tooth rest is required to insure thatproper lead is maintained. It should be placed onthe back of the tooth being resharpened at a pointdeeper than the chipbreaker. Now grind the radialrelief and clearance as described above.It is important to remove the entire wear land whenresharpening tools. Therefore, tools should beinspected frequently during use and resharpenedbefore the wear land becomes excessive. Regrindingcan generate considerable heat and care should betaken not to burn the cutting edge.TECHNICAL PAGESFACE OFENDMILLTOOTHRESTCUPTYPEWHEELGrinding the Radial Relief AngleSAUCERTYPEWHEEL1° – 3°STOCKREMOVEDFROM FACEGrinding the Cutting FaceTOOTHRESTTOOTHRESTRESHARPENING GEOMETRY FOR RUFF-N-TOUCH ® END MILLSDia.Radial Rake Radial Relief Radial Land Width Radial Clearanceof Cut I II III IV, V I II III IV, V I II III IV, V I II III IV, V1/2 10° 8° 5° 14° 12° 8° 8° 13° .018 .023 .015 .019 20° 18° 16° 23°5/8 10° 8° 5° 14° 12° 8° 8° 13° .018 .023 .015 .021 20° 18° 16° 22°3/4 10° 8° 5° 14° 11° 8° 7° 12° .020 .025 .020 .024 20° 16° 14° 22°7/8 10° 8° 5° 14° 11° 8° 7° 12° .020 .030 .020 .026 20° 16° 14° 22°1 10° 8° 5° 14° 10° 8° 6° 12° .025 .030 .025 .028 20° 16° 12° 21°1-1/4 10° 8° 5° 14° 10° 7° 6° 11° .025 .030 .030 .032 20° 16° 12° 20°1-1/2 10° 8° 5° 14° 10° 7° 5° 11° .025 .035 .035 .033 20° 14° 10° 20°2 10° 8° 5° 14° 9° 6° 5° 10° .028 .040 .040 .036 18° 12° 10° 19°Axial relief and clearance angles are the same as radial relief and clearance angles.Axial land width is 1.5 times wider than radial land width.For technical support and questions about you machining requirements, please call us at 1-800-682-8832101
Serving the Metal-Cutting Industry for Five Decades.RESHARPENING ROUGHING END MILLSRoughers are sharpened by grinding the radial rake faceand fillet of the flute on a tool and cutter grindingmachine using a saucer shaped grinding wheel. Dress thewheel to match the form of the flute face from the ODto the fillet. The grinding head should be turned to anangle slightly greater than the helix angle of the end mill(1° to 3° extra). This allows the leading edge of the wheelto hollow grind the rake face. Typically, the finished hookmeasures 8° to 12° (Figure 1).A tooth support finger is required to insure that properlead is maintained. For this type of roughing cutter,the support finger rests on the back of the tooth beingsharpened, located below the form (Figure 2).It is important to remove the entire wear land whensharpening tools. The tool can be spun-ground on theperiphery to establish a guide for the amount of ODmetal to be removed. Regrinding can generate considerableheat and care should be taken not to burn thecutting edge.FACE OFEND MILLFigure 1TOOTH RESTFINGER8" TO 12"HOOKFigure 2SAUCERTYPEWHEELSTOCKREMOVEDFROM FACETOOTHRESTFINGERTECHNICAL PAGESFor technical support and questions about you machining requirements, please call us at 1-800-682-8832102
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