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Posted by N_Cook on May 31, 2008, 8:05 am
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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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Posted by newshound on May 31, 2008, 9:21 am
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A V-belt won't work if it bottoms in the groove. This is just an undercut to
ensure there is no radius at the bottom of the contact faces.
>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.
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Posted by Den on May 31, 2008, 9:22 am
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>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
>
>
Often the drive belts are square cross section rather than round and sit
neatly in the root of the pulley slot. Maybe this has some bearing on the
design?
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Posted by newshound on May 31, 2008, 9:51 am
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>
>>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
>>
>>
>
> Often the drive belts are square cross section rather than round and sit
> neatly in the root of the pulley slot. Maybe this has some bearing on the
> design?
Like I said, except that these pulleys all seem to be for square belts. For
these to work, the root radius of the pulley has to be smaller than the
radius of the belt corners. With an undercut slot like this even perfectly
square section belts will be fine.
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Posted by Den on June 1, 2008, 10:08 am
Please log in for more thread options
>
>>
>>>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
>>>
>>>
>>
>> Often the drive belts are square cross section rather than round and sit
>> neatly in the root of the pulley slot. Maybe this has some bearing on the
>> design?
> Like I said, except that these pulleys all seem to be for square belts.
> For these to work, the root radius of the pulley has to be smaller than
> the radius of the belt corners. With an undercut slot like this even
> perfectly square section belts will be fine.
Out of interest what is the advantage of square section belts - are they
easier/cheaper to manufacture than O section belts????
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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.