b'Reamer Rundown a very high-quality hole in manysaid GWS Tool Group might be able instances. to put up to three flutes on a 2 mm In addition to the choice of ma- (0.079") dia. reamer, but the num-may reach IT5. terial, the performance of a reamerber could go up to 11 on a 20 mm depends on its number of flutes. (0.787") dia. reamer. He said its typ-Basic Considerations We want to use as many flutesically a good practice to put an odd If reaming is necessary after all, heas possible because that helps withnumber of flutes on a reamer be-said a solid-carbide reamer usuallythe finish, said John Kiiffner, North- cause this reduces its tendency to can handle small-to-medium-size pro- east director of sales at GWS Toollobe a hole.duction runs. For higher-volume pro- Group in Tavares, Florida. TheWith an odd number of flutes, duction, he recommends somethingmore surface contact we have whenKiiffner said, you get a more pre-like Iscar Metals Bayo T-Ream, a mul- reaming, the better. cise round hole than if you use an tiflute reamer consisting of a solid-car- Thenumberofflutesthataeven number.bide head mounted to a steel shank.reamer can accommodate is basedAnotherfactorthatimpacts Covering a range from 11.5 mm to 32on its diameter. For example, hereamer performance is edge prep-mm (0.453" to 1.26") in diameter, Bayoaration. Ewing said edge prep en-T-Ream offers the speeds of carbideabout the authorcompasses the grinding and hon-rather than high-speed steel, he said,ing of the cutting edge, the coat-as well as good repeatability when theWilliam Leventoning used and the lead angle of the head is replaced. is a contributingreamer. Iscar Metals uses a num-For medium-to-high-(volume)writer for CTE.ber of different edge preps for its production runs, Ewing said, youContact him atreamers, depending on the mate-get very fast metal removal rates609-920-3335rial being cut. Its standard edge or wleventon@for the reaming operation and alsogmail.com. prep is a general-purpose one thatSeptember 2123, 2O21Come visit us in Rosemont! Booth #3O7Balancing Technology Measuring and Tooling Technology Shrinking Technology Presetting TechnologyHAIMER Tool DynamicFor highest balancing grade, best surface finish and maximum tool life www.haimer.com20SEPTEMBER 2021Reaming.indd 20 8/17/21 3:05 PM'