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acid alloys aluminum angle antimony belt blank brass bushing calipers carbon cast iron cent change gears chilled iron chuck circle circular pitch clamp column copper corresponding cosine counterbore crank cubic cutters cutting edge cutting speed cylindrical decimal Depth Diam diametral pitch disks distance divide emery equal feet finishing foot forging fraction gauge hardened heat helix holes horsepower Inch Inch index head lathe lathe centers lead screw length machine measured metal Milling cutters minute multiply number of teeth number of threads piece pipe pitch diameter polish Pounds pulley punch radius reamer revolutions per minute rivet roughing Rule.—To find sal ammoniac screw threads shaft shank shown in Fig side sine solder spindle square STANDARD THREADS steel tangent taper Thickness threads per inch tool turned Twist drills vernier vernier scale weight welding worm wrought iron zinc