Sandeep

There is no firm rule to follow as to the best radius for the counterweights, but I would tend towards making the weights as thin as practical as this will reduce the bending moment and stress on the shaft. ■

COMPANIES make shaft configurations from different design criterias. Some general comments:

1. Straight concentric shaft. Here you would have no offset on the shaft itself but, would have large counterweights on a circle throw screen shaft to make your circle. Fully loading weights on the counterweights usually makes for a screen subject to more shaft DEFLECTION OR possibility of a SPRUNG SHAFT.

2. Bellied offset shaft. Here you have a straight shaft with an eccentric BELLY offset cut into the six oclock position. Another words the offset would be spread across the whole width of the turning shaft or equally distributed with smaller offset counterweights needed to obtain your stroke or circle. Less likely to have SHAFT DEFLECTION on this design.

I will dig out some pics, explains it simple. ■