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
Thanks in advance,
Marty
'order a new set' of what exactly? As stated above, changing the belts will not make any difference.
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.
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.
martyh said:
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.
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
Think in terms of a lathe principle so the runout error is focused and ground down only.
Regards
David
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