b'is clamped in theshow the magnitude of this, the ma-vise, the originalchined surface of the 152.4 mm-long flatness of the ma- part is clamped to a straight edge. terial is maintained.That surface has an arc that amounts But when the partto 1.27 mm (0.05") over the length. isremovedfromFor large, round parts with fussy di-HOT-ROLLED VERSUS COLD-ROLLED STEEL The photograph showsB. Taylor thevise,thepartmensions and slots, its wise to ma-wont be flat. The stress in the steel ischine diameters of the part and then what happens if cold-rolledout of balance, and the unmachinedstress-relieve before the slots are cut.steel is used without stresssurface of the part has contracted. ToI hope that this helps.CTErelieving.wont remove any more stress and results in oxide buildup on the metal.Hot rolled has a rougher surface finish, and the corners on flat bars are rounded. Cold rolled is rolled on all surfaces for better surface finish and square corners.Here is an example project. This job is to make a spacer to fit under apillowblock.Thedimensions are 5.59 mm38.1 mm152.4 mm (0.22"1.5"6") with two 12.7 mm (0.5") dia. holes. The speci-fied material is steel. The two ob- PROVIDING CARBIDE BLANKS vious choices for the material toAND PREFORMS FORstart with are 6.35 mm38.1 mm (0.25"1.5") flat bar in either hot- YOUR MOST CHALLENGINGrolled A36 or cold-rolled 1018. TheAPPLICATIONSpart will be clamped in a milling vise and milled on one surface to theAt H.B. Carbide, our passion is improving your 5.59 mm dimension, and the holesprocess ef\x1fciency and overall cost effectiveness.will be drilled. Because of its betterOur vertical integration means we have the surface finish and square corners,equipment and capability to manage our entire the cold-rolled 1018 is preferred. process from powder through \x1fnished ground The photograph shows what hap- blanks, available in a comprehensive selectionpens if cold-rolled steel is used with- of grades. The bene\x1ft? Consistent, reliable,out stress relieving. When the parthigh performance solutions, no matter howchallenging your application.about the author Brandt Taylor is owner of Berlin, Massachusetts-based Taylor Engineering, a machine shop and manufacturer of lathe chuck jaws. He canH.B. Carbide Companybe reached at gbrandttaylor@ 4210 Doyle DriveLewiston, MI 49756gmail.com. For more+1 (800) 459-8521information about the [email protected], visit www.stopjaws.com. hbcarbide.comctemag.com/cteguide.com11MachinistCorner.indd 11 6/17/21 10:11 AM'