How about the fact that the surface speed of a roller with a curved surface varies according the radius at any specific point ...... ■

Profiled rollers were discarded soon after the inception of belt conveyors because they generated excessive wear on the outer belt portions due to the peripheral speed variance.

Profiled rollers are used in steel mills to centralise ingots & slabs: but there is no intermediate belt in such applications.

I am ignoring the chance to mention the speed variance which a horizontally curved belt experiences across the present day troughing idler sets. ■

The chance to not mention is long gone along with all the other candy in the store.

Here the crumbs say you missed the little bit about inner and outer speed differential is idler stand-by-stand. The difference does not register in the main. ■

Originally Posted by nordell

......The difference does not register in the main.

Thereby acknowledging the difference exists. It's a wind up for goodness sake.■