process.Anerroratthisstage wouldmakeofthealreadyextensivelymachinedwork- pieceanexpensivelumpofscrap.Theoilholesare usuallydrilledintothecrankshaftinitssoftstage,i.e. beforeitishardened.Astheyaredrilledatveryacute angles,theiredgesthrowupaverythinprojectionof material.Ifthemainandpinbearingsarehardenedaf- terthe...