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Thread: Anti vibration for 8" grinder?

  1. #1
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    Anti vibration for 8" grinder?

    This grinder was fine when I had it on a wheeled dolly from Harbor Freight but that made it too high so I pulled the dolly out. Now the grinder walks all over the shop. I'm going to take the wheel and wire wheel off and start at that point. Put one back on and turn it in 1/4 turns and see if that'll make it run better.

    But do you have any suggestions for which rubber mat to go under it or feet with a 3/8" shaft? Couldn't find any of those online. Wheels won't work, the skirt around the edge is too close to the holes and the wheels will bind up. That's what I wanted to do but found out differently.
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    Re: Anti vibration for 8" grinder?

    Something doesn’t seem right to me.

    It must be out of balance or something.

    The way you have it bolted to a cast-iron stand
    It should not be walking all over the shop
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  3. #3
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    Re: Anti vibration for 8" grinder?

    Nvm...
    Last edited by N2 Welding; 3 Days Ago at 04:04 PM.
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    Re: Anti vibration for 8" grinder?

    It's walking because it's top heavy and the slightest vibration is being amplified. Possibly a chunk of 1/2" or 5/8" conveyor belt might help. Or just anchor the thing to the floor. I had one mounted on the old standard 22.5" truck wheel that would crawl around until I put 3 equally spaced pads on the rim so it would always sit in contact with the floor. 3/4" horse stall mat is good stuff too if your base is big enough to not be tippy.

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  6. #5
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    Re: Anti vibration for 8" grinder?

    Either true your stone, or put on a new stone.

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    Re: Anti vibration for 8" grinder?

    wheel that is not true or is out of balance is also unsafe. True it up, if that doesn't stop it, then replace it.
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  10. #7
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    Re: Anti vibration for 8" grinder?

    I have used rubber cut from a big truck mudflap. Be sure to use locking nuts on the bolts.

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  12. #8
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    Re: Anti vibration for 8" grinder?

    I took both wheels off and ran it. Ran fine. Then the wire wheel went on, I adjusted it in 1/4 turns until nearly all vibration was gone. Then the grinding wheel went on. The grinder walked all over the place even with turning the wheel in 1/4 turns.

    So I put a dial indicator on it and it was out of round by .020. I'll get a flat wheel dresser and see if that will true it up. Maybe if any vibration is left after truing it will go away with a rubber mat.

    I can't bolt it down, my shop is small and I need to move it from time to time. Since someone mentioned it, it's not top heavy. It just looks that way because of the angle my phone shot it at. That Burr King base weighs a lot.

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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by N2 Welding View Post
    Nvm...
    Nvm??

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    Re: Anti vibration for 8" grinder?

    Is it just my eye or is that grinding wheel off center on the vertical axis?
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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by mla2ofus View Post
    Is it just my eye or is that grinding wheel off center on the vertical axis?
    It looks laid over big time but it must be the lens doing that.

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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by JD1 View Post
    Nvm??
    I was pretty much just saying what you already mentioned you will try.
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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by JD1 View Post
    Maybe if any vibration is left after truing it will go away with a rubber mat.
    The horse stall mats work good.

    I just sold a belt grinder that I mounted on top of a stand with some of that Mat.

    Tractor supply has them

    Also if you snoop around at the local gyms, sometimes they throw away the old mats.

    I got a couple for the garage that way.
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  18. #14
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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by mla2ofus View Post
    Is it just my eye or is that grinding wheel off center on the vertical axis?
    Just the camera angle. However, I was curious and put my dial indicator on the side of the wheel to see if there was any wobble or runout. Kind of tough to measure due to the roughness of the wheel but it was mostly around .005 with one spot at around .018. So I'll true the face and see where I'm at with the vibration.

    Does anyone know if you can true the side of a wheel? Yes, I know, just get another wheel. But I like to fix stuff if I can.

  19. #15
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    Re: Anti vibration for 8" grinder?

    Myself personally I think you may be going in the wrong direction. It needs to be bolted solid but you say you don't want that then you need some way of quick releasing a solid mount.

    A grinder is not something you want on isolation of any sort IMO. The more solid it is fastened to more base the smoother it gets.

    You don't want the stone to be moving while grinding for sure. Maybe pick a spot for when you are going to be doing a lot of grinding and install some recessed anchors you can put a couple bolts in quickly and remove when your done.

    Rubber under the base and anchored too may be another good way.

    For portability without anchoring the rubber matt from Rural King or other farm store under the whole thing would keep it from walking.
    Last edited by danielplace; 2 Days Ago at 07:15 PM.

  20. #16
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    Re: Anti vibration for 8" grinder?

    A thick rubber mat for putting under a treadmill or other exercise equipment would work. I use one to lay on on the dirt floor in my pole shed when working on stuff.

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    Re: Anti vibration for 8" grinder?

    Check the wheel and the flanges for run-out. True the wheel after checking. I do not trust low-budget wheels. Abrasive machining is great, but it can be dangerous if the stone flies apart.
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  23. #18
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    Re: Anti vibration for 8" grinder?

    Well, I need a little more help - I'm evidentially doing something wrong. The small hose clamp keeps the diamond dresser running along the rest without going in and out with the wheel discrepancies. However, it's worse now than when I started.

    The surface is much smoother which makes it easier to run the dial indicator on it but instead of being off .020, now the high area is almost .030. The grinder vibrates a lot. And I am sliding the dresser back and forth, not holding it still in one spot.

    One thing i noticed after a while is that the rest is angled, not at 90 degrees. I tried to clamp a piece of flat bar onto it to get it to 90 but the vibration moved it around. I didn't even use it. So I'm going to temporarily tack it down. Therefore the face of the wheel is probably slightly angled which will straighten up when I tack the flat bar down.

    I've seen diamond point dressers and you buy a jig to run them with but that's too expensive and seems to me to be overkill unless I was using the grinder every day to make money.

    So those of you who have done this, what might I be doing wrong and what should I change?
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    Re: Anti vibration for 8" grinder?

    Quote Originally Posted by Oldendum View Post
    Check the wheel and the flanges for run-out. True the wheel after checking. I do not trust low-budget wheels. Abrasive machining is great, but it can be dangerous if the stone flies apart.
    Side runout was roughly .005. Face was .020 now it's almost .030.

  25. #20
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    Re: Anti vibration for 8" grinder?

    Is the arbor in the wheel the correct size for the shaft of the grinder?
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  26. #21
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    Re: Anti vibration for 8" grinder?

    Yep, 5/8".

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    Re: Anti vibration for 8" grinder?

    Forget all that diamond dresser stuff. Get one of these.

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    This is a pic of some POS thing from HF. There should be more wheels in a good one. But anyways......................this is all you need to true up a wheel.

    I run a grinder on a little mat, and true it occassionally................doesn't walk.

    If you actually have runout, hold the dresser at a position where it only partially contacts the wheel in the high spots. Don't just shove it in there. You have to kill the high spots.

  28. #23
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    Re: Anti vibration for 8" grinder?

    A good dresser should have between 5-8 wheels on it, but ya get my drift.

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    Re: Anti vibration for 8" grinder?

    I like a GOOD diamond dresser, but it may be "following" the runout of the wheel so it's not actually dressing the high spot down and just following the shape of the wheel. You also need to check the shafts for runout. I have never liked the idea of reversing the direction of rotation, nor do i think it's safe to face/true the sides of a wheel unless it's a wheel designed to be a "face" wheel. also make sure the cardboard blotters are in place and in good condition. The wheel type dresser might be a better choice until you get it trued.
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  31. #25
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    Re: Anti vibration for 8" grinder?

    I use the single point diamond dressers myself... never liked the bar type like you posted...

    But like all the dressers you must make sure it is not moving in/out when you use them!!! at least if you want a nice true finish
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