Lathe vibration issue-SOLVED!

Lathe vibration issue-SOLVED!

Joined: August 20th, 2006, 5:36 am

March 13th, 2012, 12:40 am #1

I've been struggling with a nagging vibration ever since I replaced bearings and belts in my old belt drive Grizzly lathe. Nothing I tried would make it go away, and it was having an impact on my surface finish. I also suspected that the new spindle belt was mis-marked, all the tension adjustment I had wasn't enough to get the belt very tight.

Well, I finally had enough, but I didn't really feel like pulling the spindle again to try another belt. So, I ordered enough of the Fenner Power Twist link belt from McMaster-Carr to replace both belts on my machine. What a difference! Not only did it eliminate virtually all the vibration, it also runs much quieter, and there's no squeal when I start it up at top speed. I also think it's running a little bit faster. Maybe the new belts are running higher in the pulleys?

Also, that spindle belt I was questioning? I had to cut it to remove it, same as the original belt, which I still have on hand. The brand new belt, with the same B33 marking on it, was a good 3" longer than the old, worn, stretched belt. No wonder I couldn't get it tensioned properly! So much for "industry standards", guess I won't be relying on belt numbers in the future.

Not sure why I put this off so long, I've used these belts before and been very pleased with them. My only concern was/is running them in reverse, but the only time I really need to do that is if I'm doing metric threading, and that will be at very low speeds anyway, so I'm not going to worry about it.

Anyway, just thought I'd pass this on for any of you that might still be on the fence about trying these. I'll admit, I haven't tried turning anything yet, but I'll be heading out to the shop soon, if my surface finish doesn't show a marked improvement, I'll let ya'll know. Later.

Dave
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Joined: December 3rd, 2010, 5:56 pm

March 13th, 2012, 3:45 pm #2

Congrats!....nt
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Joined: September 21st, 2007, 12:13 pm

March 15th, 2012, 12:52 pm #3

I've been struggling with a nagging vibration ever since I replaced bearings and belts in my old belt drive Grizzly lathe. Nothing I tried would make it go away, and it was having an impact on my surface finish. I also suspected that the new spindle belt was mis-marked, all the tension adjustment I had wasn't enough to get the belt very tight.

Well, I finally had enough, but I didn't really feel like pulling the spindle again to try another belt. So, I ordered enough of the Fenner Power Twist link belt from McMaster-Carr to replace both belts on my machine. What a difference! Not only did it eliminate virtually all the vibration, it also runs much quieter, and there's no squeal when I start it up at top speed. I also think it's running a little bit faster. Maybe the new belts are running higher in the pulleys?

Also, that spindle belt I was questioning? I had to cut it to remove it, same as the original belt, which I still have on hand. The brand new belt, with the same B33 marking on it, was a good 3" longer than the old, worn, stretched belt. No wonder I couldn't get it tensioned properly! So much for "industry standards", guess I won't be relying on belt numbers in the future.

Not sure why I put this off so long, I've used these belts before and been very pleased with them. My only concern was/is running them in reverse, but the only time I really need to do that is if I'm doing metric threading, and that will be at very low speeds anyway, so I'm not going to worry about it.

Anyway, just thought I'd pass this on for any of you that might still be on the fence about trying these. I'll admit, I haven't tried turning anything yet, but I'll be heading out to the shop soon, if my surface finish doesn't show a marked improvement, I'll let ya'll know. Later.

Dave
was a good question, so I Called Fenner and their response was if the machine is going to have 50% or more reverse usage they don't recommend using the Power Twist belt. Since I doubt that most folks are going to run their lathe backwards that much there shouldn't be any issue.
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Joined: August 20th, 2006, 5:36 am

March 15th, 2012, 4:41 pm #4

I knew that running them in reverse wasn't recommended, but I didn't know it was that definite. No worries, then, I doubt I'm close to 10% much less 50%. Later.

Dave
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Joined: September 21st, 2007, 12:13 pm

March 15th, 2012, 9:03 pm #5

about trying one of those for a while now. But since I didn't have any real issues with my std. V belt I would always put it on the back burner. However, after checking I see that my V belt is about 18yrs old, it for sure isn't worn to death, just too many birthdays for it to be very pliable. So I think I'll byte the pellet and order one.
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