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| 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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