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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Pulley construction query
On Sat, 31 May 2008 13:05:52 +0100, "N_Cook"
wrote: A picture of a random collection of pulleys http://home.graffiti.net/diverse:gra...et/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. more likely a machining aid during manufacture. a V point tool cutting on both sides of the V is pretty well a machining nightmare. far easier to make a slot then do a single face cut out from each side to form the V. |
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