Paired Vee-belts (alternator drives)
Thought I'd give you all a heads up on V-belts, and multiple v-belts, as used on alternators etc.:
Just because v-belts purchased together are purchased new, DOESN'T mean they are the same size! Manufacturing being what it is, tolerances are pretty good, but not perfect.
When I worked in a printing plant and we used gigondo motors to run compressors/chillers, we used SETS of belts. These are purchased SPECIFICALLY as sets, to ensure they all pull part of the load. Sets come in two, three, four, five, etc. belts.
Most belts are close in size, but unless they are EXACTLY the same size, when you put two on your twin-pulley setup, one will be looser, leaving the other to do most of the work...and that leads to early failure.
Better to get a matched set, they'll last longer and be MUCH less likely to leave you stranded somewhere.
We got our vee-belts through W. W. Grainger, but a good power transmission shop (belts, conveyor belts, etc.) should have them.
You'll pay a couple extra bucks, but they are WORTH it.
My $0.02
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