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addendum angle adjustment apex distance arbor attachment automatic backlash blades Brown & Sharpe Buck & Hickman centre circular pitch clamps concave side correct crown gear cut gears dedendum depth diametrical pitch die-milling machine Divide division plate drive end mill face feed finished fixture formate gear gear and pinion gear cutting gear teeth groove headstock hypoids impression index crank index plate indexing head involute Involute System large end lathe lead screw mandrel mesh method milling cutter milling machine mould movement Multiply number of holes number of teeth obtain operation pantograph milling pitch diameter pitch line position produce profile bearing ratio right-hand spiral rotary rotated set the cutter shown in Fig shows slide slots small end spindle spiral bevel gears spiral gears spur gear straight bevels table screw taper testing machine thickness tooth angle tooth bearing tooth curves tooth load tracer turn wheel whilst worm