Under the misalignment condition of two shafts of the equipment, the teeth contact in case of Gear Coupling will be as minimum. Under heavy loads the ends of the hub teeth will get damaged resulting in the excessive play between hub and sleeve. And therefore, the reduction in life of coupling. The triple crowned teeth hub is leading on a fully automatic hobbling machine with built in crowning attachment which is controlled by hydraulic and electronic systems. Due to misalignment condition the curvature of teeth flank the contact area is much more and therefore, there is increase in life of coupling.