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Tool Talk Discussion Forum

V Belt Tension???

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Denny 2

12-27-2007 17:24:12




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I know I can get good answers here so thats why I am asking. As a general rule how tight do you make a V belt that is driving a fan on a air handling unit. I know that it may vary according to the length of the belt, but just looking for a general rule. Thanks guys!




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greygoat

12-30-2007 12:01:49




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 Re: V Belt Tension??? in reply to Denny 2, 12-27-2007 17:24:12  
You can get a v-belt tension gauge.
I worked for a major bearing and industrial
supply distributor. (belts, pullys, chain,
sprokets, gears, bearings, seals) and all of
the salesmen had them. It helped customers to
set up their equipment. Ours came from one of
the big belt people-Goodyear, Dayco, Browning.
Automotive speciality tool people might have
them, or Snap-on or Mac. Newer vehicles, of
course have tension preset by belt tighteners

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RobMD

12-27-2007 18:07:44




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 Re: V Belt Tension??? in reply to Denny 2, 12-27-2007 17:24:12  
V Belts stretch under load. Some V-belt systems have a set tension with a preload spring while others have NO preload spring. Springs keep that consistent pressure no matter if the belt strectches or not.

Overtightening a belt will cause premature wear and tear on any pulley and bearings. A belt that is too loose will slip under load. Common rule of thumb for a car v-belt is that if you can turn the alternator by hand, then your belt is not tight enough.

For the belts that have no spring tension and just an adjusting mechanism, 3/16" of deflection per foot of span is sufficient.

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