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accuracy acme thread assembly prints auxiliary views bevel gears bill of material block bolt bottom cap screw circular view clamp Common fraction contain counterbore Countersink curve cylinder decimal describe detail print dotted lines drawn drill eighths fasten Figure finished flat form of thread front view give head helical gears hidden edges hole indicated internal threads invisible edges KEYWAYS Knurl lesson limits located machine screw machinist major diameter measured mechanic method mixed number national form number of threads object over-all dimensions over-all length piece pitch circle pitch diameter pressure angle pulley quarter reamed rectangle rivets scale section view section-plane line set screw shaft shape shown in Fig side view sixteenths sixty-fourths slant surfaces spokes Spotface spur gears standard subtract taper thirty-seconds thousandths thread is called threads per inch three views three-view drawing tolerances tooth thickness top view usually visible edge width worm worm gears