| martyh |
I’m just putting the finishing touches on my belt drive project and I noticed a slight wobble in the pulley. I measured it with a dial indicator at .009”. I was able to make an adjustment and have it down to .003”. I’m using a VPI hw-19 motor, pulley and belt so I’m wondering if the elastic belt will take up some of the slack. What say you, should I order a new set or will this one be okay?
Thanks in advance,
Marty |
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| EC8010 |
| Eccentricity on a motor pulley will cause wow and flutter - changing the belt won't help. |
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| YNWOAN |
| 'order a new set' of what exactly? As stated above, changing the belts will not make any difference. |
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| martyh |
Thank you for the replies. I’m sorry if the original post was confusing. I meant to ask if I should order a new motor and pulley set. My hope was that the elastic nature of the belt would mitigate some of the variation.
Thinking about it further, I see that the wobble is effectively changing the radius of the drive pulley by .003” 20 times a second. As I see it now, the elasticity may lower the peak speed variation but never eliminate it. |
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| EC8010 |
| quote: | Originally posted by martyh
Thinking about it further, I see that the wobble is effectively changing the radius of the drive pulley by .003” 20 times a second. As I see it now, the elasticity may lower the peak speed variation but never eliminate it. |
You have it exactly. My commiserations. Some members have said that they have been able to true pulleys by running them with a clamped Dremel (or similar) carrying a grindstone brushing lightly against them as they run. If you have a Dremel and you're going to buy a new motor and pulley anyway, you've nothing to lose. |
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| AVWERK |
Yeah, you would want to lock the body of the motor and the same with the Dremel in some way.
Think in terms of a lathe principle so the runout error is focused and ground down only.
Regards
David |
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| martyh |
| Great idea, thanks. In the mean time I’ve pulled another set from my hw-19 to use. |
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