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Posted by Wild_Bill on May 31, 2008, 2:01 pm
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The groove is just to make them harder to clean, of course.
The light-duty belts used in these small mechanisms typically aren't V-belts
of the common type used in larger appliances or machines.
The VCR and other belts are rarely ever cord reinforced, and belt tension is
low to barely adequate.
As Den mentioned, and I know Nigel already knows, the belts are often
square-cut in cross section (90 degree V).
The groove will allow the belt faces to completely contact the pulley drive
faces, allowing the most effective transfer of motion.
The square drive belts rarely shed (but commonly glaze), but can stay
completely seated in the pulley groove under varying conditions.
In addition to allowing full contact between the belts/pulleys,
manufacturers will do almost anything to save raw materials (the compound or
metal used for the pulleys), to save costs and to make the parts lighter.
It surprises me, the lengths that manufacturers will go to in mold making,
to save materials/resin, which in most cases jepordizes the strength or
mechanical integrity of a part (part weakness increases the chances of the
part being non-repairable or non-reuseable).
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html
>A picture of a random collection of pulleys
> http://home.graffiti.net/diverse:graffiti.net/pulleys.jpg
> plastic brass and aluminium for use with rubber drive bands in tape
> recorders, VCRs etc. They all have a small groove at the root of the V
> section of the pulley. Anyone know the function or reason for this
> groove?.
> All I can think of is it may avoid an aquaplaning type possibility of air
> getting trapped under the rubber band snd so wow/flutter possibiliy.
>
>
> --
> General electronic repairs, most things repaired, other than TVs and PCs
> http://www.divdev.fsnet.co.uk/repairs.htm
>
> Diverse Devices, Southampton, England
>
>
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> http://home.graffiti.net/diverse:graffiti.net/pulleys.jpg
> plastic brass and aluminium for use with rubber drive bands in tape
> recorders, VCRs etc. They all have a small groove at the root of the V
> section of the pulley. Anyone know the function or reason for this
> groove?.
> All I can think of is it may avoid an aquaplaning type possibility of air
> getting trapped under the rubber band snd so wow/flutter possibiliy.
>
>
> --
> General electronic repairs, most things repaired, other than TVs and PCs
> http://www.divdev.fsnet.co.uk/repairs.htm
>
> Diverse Devices, Southampton, England
>
>