... 1. Automobile manufacture industry : screw,gear, shaft ,connection rod ,camshaft,etc. parts 2.Tractor and construction machinerey : tanks, guide wheels, ... lathe , milling machine, grinding machine ;gear, shafts,spline shaft ,etc.4.Heavy machinery:Concret pump convey machine, excavator ( ... protection50degreesInduction coilsInduction heating principle copper induction coils for shaft heating equipment