The loss of power occasioned by the use of a tightener, is the power required to bend the belt under that pulley and to drive the pulley. By placing the tightener near the smaller pulley of two of unequal size, there is a greater loss than when it is close to the larger, since the belt requires to be more bent in the former case. The best place, therefore, to put a tightener, is as close to the larger pulley as it can be arranged to have it work satisfactorily.

Universal Point For Boring-Tool