This dedicated fixture is used to grind crank pin holes in through hardened crankshafts. The crank pins used are full hard M-2 steel & are a .0012 to .0014 press fit. The press fitting operation is done with a fixture to insure alignment when starting the crank pin in the ground hole. The crankshafts are made of AISI S-7 shock resisting tool steel; tensile strength is 285,00 p/si; yield strength is 220,000 p/si; hardness is 53 rockwell Rc; with a Charpy impact value of 219 ft lbs. This fixture could also be used to grind a one piece crankshafts crank pin; including the induction valve driver. The crank throw of this fixture is fixed at .9020.
A fixture like this assures that every crank is exactly the same!
