Gallery, Projects and General > The Design Shop

Poly V Pulley and belt

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Swarfing:
I think i'm going to have a go at making one. Just need to find a gap in the weather now to cast up some blanks  :beer:

velocette:
Hi fell over this thread when surfing

Poly Vee pulleys have the grooves cut at 40 degrees 2.34 mm pitch.

 BSP is 55 degrees pitch this will make for a very poor contact.

Eric

Swarfing:
Thanks for the info Eric, Already received a 11TPI pipe thread tool that will do the job. Did a test cut and it will work out just right.

chipenter:
Sieg machines use J polly v belts Arceurotrade stock them ,

John Stevenson:

--- Quote from: velocette on April 09, 2013, 05:06:12 PM ---Hi fell over this thread when surfing

Poly Vee pulleys have the grooves cut at 40 degrees 2.34 mm pitch.

 BSP is 55 degrees pitch this will make for a very poor contact.

Eric

--- End quote ---

Eric agreed but the belt is rubber and soon adapts.
Back in 1999 I built a pencil sharpener and the cutter ran on poly vee belt, 3;1 step up ratio from a 3,000 rev motor so the spindle does 9,000.

Now don't laugh about it being a pencil sharpener, it sharpens 7,000 per hour and was part of the millennium display in the dome in 2000.

Been running ever since, about 6 hours a day, 5 days a week, so far it's got thru 4 belts and one set of pulleys.

I always think proof is better in practice.

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