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Tool Talk Discussion Forum

You guys with heavy compressor motors, belt tensio

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markiz41

05-30-2007 07:31:20




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Can you share some of your tricks and secrets on how you adjust the belt tension on a multi-belt drive, 90+ lbs motor? I've always used a ground down eye turnbuckle jammed between the comp. flywheel and the motor sheave, but since I had to downsize the sheave, the turnbuckle keeps jumping off under tension and this is getting dangerous. I tried jamming one eye into the crevice between the motor housing and baseplate and the other - up against the pump, but this setup lifts up the motor when tensioned. I'd like to get a few ideas please.

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NC Wayne

05-30-2007 16:01:58




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 Re: You guys with heavy compressor motors, belt te in reply to markiz41, 05-30-2007 07:31:20  
You need to get an adjustable baseplate for the motor. The assembly bolts down to the tank and then has slotted holes in it where the motor sets. Typically under those holes is a bar spanning at least two of them that the motor them bolts loosely to. From this bar there is a threaded rod running to the back side of the assembly. Once the motor is loosely bolted in position you then you tighten the nut on the rod to to pull the belts tight. When their tight you go ahead and tighten the motor down tight and your done without alot of hassel. Don't know what frame motor you've got and there are 7 different ones listed that are readily available, but a Grainger number for say a 143T frame is 3M277 and the price in their 2001 catalog for it is about $20. If you want to make the compressor the movable part simply find one with a frame size close and modify it to fit. These frames are designed so they pull the motor/other part straight back so even in a multibelt setup you get even tension on all belts.

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markiz41

05-30-2007 19:07:06




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 Thanks, Wayne in reply to NC Wayne, 05-30-2007 16:01:58  
Much appreciated. I'll go search for one now.



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XRogerX

05-31-2007 19:16:08




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 Re: Thanks, Wayne in reply to markiz41, 05-30-2007 19:07:06  
Put the belts on the motor. Pull it out as tight as you can by hand, keeping the motor base parallel to the edge of the tank saddle. Etch a line in the paint with a scribe, or draw a line with a pencil, about 3/16" to 1/4" away from the edge of the base. Remove the belts, and move the motor so that the base lines up flush with the line. Tighten all bolts, making sure, with a ruler or tape measure, that the motor base is parallel to the saddle edge. Install belts one by one. Check tension to see if desired tightness has been achieved. If not, repeat.

The motor mount plate is a better setup, but not always practical on smaller machines.

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markiz41

05-30-2007 15:33:15




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 nobody? in reply to markiz41, 05-30-2007 07:31:20  
I guess you just set it and forget it.



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