Convex Roller Theory
Convex Roller Theory
(OP)
I'm looking for an old theory that explains why belts on a belt sander stays on the center of the convex roller. The same theory applies to flat belt on a crowned pulley (on old farm equipment), some paper mill applications, vacuum cleaned belts etc.
Does anyone know where I can find the theory behind this?
Thanks
Kiko
Does anyone know where I can find the theory behind this?
Thanks
Kiko





RE: Convex Roller Theory
RE: Convex Roller Theory
Barry1961
RE: Convex Roller Theory
I imagined the convex roller as well as conveyor belts used the same theory. “The belt seeks the highest point.”
Where is my thought wrong?
RE: Convex Roller Theory
If you picture the back of you hand as the belt with your fingers pointing in the direction of travel. As the belt tracks off to the right it will cause a curve in the clockwise direction. If you think of this curve being an extreme 45 degree angle to the direction of travel it becomes obvious which way the belt will track.
Crowned pulleys are not good for all systems or belts. You will need to have enough flex in the system to allow the curve to take place. How much flex is needed will depend on pulley OD, belt type and center distance for starters. Try to make your crown round instead of trapezoid.
Barry1961
RE: Convex Roller Theory
RE: Convex Roller Theory
You might contact a local rep to see if they still have it.
I think it may have been meant to train their field service techs.
A general rule is that the belt tracks toward where it first touches.
Barry1961