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V-Belt shafiullah.shafi 07-10-2006
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Posted by on July 10, 2006, 7:20 am
how can we measure v-belt tension by manual


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Posted by dpb on July 10, 2006, 10:29 am

shafiullah.shafi@gmail.com wrote:
> how can we measure v-belt tension by manual

Belt and motor manufacturers recommend that one not do so but we all
know it's done all the time. The following link has some guidelines
that are useful background knowledge.

www.marathonelectric.com/motors/manuals/SB528.pdf

The upshot is the measurement is the force required to deflect the belt
the proper distance at the midpoint of the span. The nominal
deflection is the span/64 and there's a table of force vs motor size
and rpm. Roughly for 1 hp motor the recommended force is 1-2 lb from
1000 to 3500 rpm.

The tension should be no greater than that required to prevent slip.
One way to observe slip if one has a timing light is to mark a spot on
the belt and use the light to observe it during operation using the
driver pulley to synchronize the light.

Not knowing anything about the application, anything more specific is
difficult.


Posted by shafi on July 11, 2006, 7:52 am
Dear Sir,

Thanks for your reply,

Best regards,

SHAFI

__________________________________________________________
dpb wrote:
> shafiullah.shafi@gmail.com wrote:
> > how can we measure v-belt tension by manual
>
> Belt and motor manufacturers recommend that one not do so but we all
> know it's done all the time. The following link has some guidelines
> that are useful background knowledge.
>
> www.marathonelectric.com/motors/manuals/SB528.pdf
>
> The upshot is the measurement is the force required to deflect the belt
> the proper distance at the midpoint of the span. The nominal
> deflection is the span/64 and there's a table of force vs motor size
> and rpm. Roughly for 1 hp motor the recommended force is 1-2 lb from
> 1000 to 3500 rpm.
>
> The tension should be no greater than that required to prevent slip.
> One way to observe slip if one has a timing light is to mark a spot on
> the belt and use the light to observe it during operation using the
> driver pulley to synchronize the light.
>
> Not knowing anything about the application, anything more specific is
> difficult.


Posted by C & E on July 11, 2006, 11:52 am
Thanks for the great link and the formula!!



>
> shafiullah.shafi@gmail.com wrote:
>> how can we measure v-belt tension by manual
>
> Belt and motor manufacturers recommend that one not do so but we all
> know it's done all the time. The following link has some guidelines
> that are useful background knowledge.
>
> www.marathonelectric.com/motors/manuals/SB528.pdf
>
> The upshot is the measurement is the force required to deflect the belt
> the proper distance at the midpoint of the span. The nominal
> deflection is the span/64 and there's a table of force vs motor size
> and rpm. Roughly for 1 hp motor the recommended force is 1-2 lb from
> 1000 to 3500 rpm.
>
> The tension should be no greater than that required to prevent slip.
> One way to observe slip if one has a timing light is to mark a spot on
> the belt and use the light to observe it during operation using the
> driver pulley to synchronize the light.
>
> Not knowing anything about the application, anything more specific is
> difficult.
>




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