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process:investment casting+heat-treatment+CNC turning+CNC milling+drilling+tapping+serrations stamping+sand-blasting+zinc-plating+grinding total about 24 steps
accurate tolerance:+/-0.003mm(0.0001'')
heat-treatment:Carbonitriding 0.24-0.38mm
zinc-plating:0.01mm
grinding surface finish:Ra.0.4
casting and machining cam shaft
