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#1
12-05-2013, 04:34 PM
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Oversized Pulley Bore Hole
I would imagine if the RPM was high, the whole system would shake violently. However, what if the RPM was around 30 RPM. Would the conveyor still function properly? At such low speeds I feel like it would still work, however, I have never seen something like this in the industrial world which is why I am curious. Last edited by cutter; 12-05-2013 at 04:53 PM. Reason: remove embedded image; upload attachment 
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#2
12-05-2013, 04:50 PM
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If it is an idler it will flop around until self destruction. If it is a driver then the shaft spin and wear itself a groove through the side.
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Walker Chief slag chipper and floor sweeper, Ironwood Artistic
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#3
12-05-2013, 04:55 PM
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Justin, please read our FAQ. We do not post embedded images for reasons explained there.
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cutter Housekeeping Staff: the Gatekeeper Director of Policy, Syntax and Grammar (by appointment) "Dr. Chandran, will I dream?" Just Keep Walking "I am not a body, I am free. For I am still as God created me."
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#4
12-05-2013, 05:20 PM
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What are the dimensions of the shaft and the bore?
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Chris One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors. Plato LET'S GO BRANDON!!!! B biggest I idot D democrats E ever N nominated
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#5
12-05-2013, 06:13 PM
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Quote:
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#6
12-05-2013, 08:25 PM
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I made a tension pulley for one once similar to the drawing.
I used 1" pipe ang 1/2" round bar stock. Ran for a couple years in a factory setting not sure if its still there or not. FYI the conveyor wasn't in constant motion and thr "pulley was at about 40-60 rpm. Ricker
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#7
12-05-2013, 08:28 PM
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At low speeds, the behaviour may just be to roll on the shaft IF the tension is just right.
Even so, with such large clearance, the behaviour of the pulley wheel will be unpredictable. Hopping, flopping side to side, etc may happen depending on the dynamic load fluctuations. Better to just put in a 1x2 bushing imho....
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Design to 0.001", measure to 1/32", cut with an axe, grind to fit.. 
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#8
12-06-2013, 02:28 PM
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If both shafts are rigidly mounted, and you have good traction on the mateing surface, what you have is a gear reduction.
This was a somewhat common way for the old slow water wheels to speed up the shafts in the mill. They would have gear teeth on the inside of the outside rim that would mesh with a gear on a shaft going through the mill wall. 20 to 1 ratios were common (20 foot wheel and 1 foot shaft gear) This was an alternative to having the wheel axel come trough the wall and doing the speed up inside.
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