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Die grinder vibration problem #3041006
05/09/22 04:28 PM
05/09/22 04:28 PM
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Washington
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hemienvy Offline OP
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My old die grinder seems to run smooth as silk when there is no bit / burr in it.

As soon as I put in a burr and turn it on, it has an out-of-round vibration. It's almost not enough to see with your eye
but you can hear it and feel it, and when you try to put it to a surface to grind on, it jumps around in an unsafe manner.

The burr has a short 2-in shank and the diameter of the cutter head is only about 1/2 inch.

So the vibration must be from the burr. It was $23 twenty years ago and is brand new / undamaged.

Are the TIR tolerances that tight on a 26,000 RPM cutting burr ?

Where do you buy quality burrs these days that don't vibrate ?

Re: Die grinder vibration problem [Re: hemienvy] #3041007
05/09/22 04:35 PM
05/09/22 04:35 PM
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Missouri
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jwb123 Offline
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My solution was to slow the die grinder down a little. I used a router speed controller from harbor freight. Seems like the burrs cut better, last longer, and the sanding rolls really last longer. easier on my hands as well. But as you said any of the long shank burs will vibrate at full speed, even had some of the sanding roll holders bend from the vibration at full speed.

Re: Die grinder vibration problem [Re: jwb123] #3041019
05/09/22 05:23 PM
05/09/22 05:23 PM
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hemienvy Offline OP
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Hmm fascinating. Total news to me, I'm not a woodworker.

JWB, What RPM do you use to grind aluminum ?

Re: Die grinder vibration problem [Re: hemienvy] #3041021
05/09/22 05:37 PM
05/09/22 05:37 PM
Joined: Oct 2010
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Ambridge, Pa.
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rickraw Offline
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Sounds like u need a new grinder. Probably the bearing has some play. I use a flex shaft fordom.

7EF44BF6-8DDD-44DF-9AEA-8479CE50DE51.jpeg
Re: Die grinder vibration problem [Re: rickraw] #3041092
05/09/22 10:06 PM
05/09/22 10:06 PM
Joined: Oct 2005
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Ontario, Canada
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Stanton Offline
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When I was using electric die grinders I used to order bearings by the dozen !! And I always had to handle the grinders with welder's gloves 'cause they got so hot. For the past 30+ years I've been using pneumatic die grinders. Even cheapies are more durable than the electric ones.

Re: Die grinder vibration problem [Re: Stanton] #3041101
05/09/22 10:53 PM
05/09/22 10:53 PM

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For what they cost, go buy a new one and see what happens. If the new one has no vibe then toss out the old one.

Re: Die grinder vibration problem [Re: Stanton] #3041107
05/09/22 11:17 PM
05/09/22 11:17 PM
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s. e. pa.
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calrobb2000 Offline
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HI

if you use the sealed bearings they get hot at the hi speed of a die grinder , you must use the metal shield type to avoid the heat buildup !

Re: Die grinder vibration problem [Re: calrobb2000] #3041126
05/10/22 07:15 AM
05/10/22 07:15 AM
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Posts: 1,825
NW Indiana
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fbs63 Offline
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I bought some cheap carbide burrs and they had a 6mm (.236) shank instead of .250. Caused the same problem till I checked them and found out.

Re: Die grinder vibration problem [Re: hemienvy] #3041142
05/10/22 08:46 AM
05/10/22 08:46 AM
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Missouri
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jwb123 Offline
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The controller is not calibrated in rpm, but high to low, I usually set it at medium. I use grinding oil on the burrs, slowing down the speed helps keep the flutes from clogging as well. I used air die grinders for years, seems the rpm was never constant with them, different from model to model and as the wore out the rpm decreased.


https://www.amazon.com/Newest-Varia...;hvtargid=pla-4584070141937617&psc=1

Re: Die grinder vibration problem [Re: hemienvy] #3041155
05/10/22 09:49 AM
05/10/22 09:49 AM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
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PA.
Originally Posted by hemienvy
My old die grinder seems to run smooth as silk when there is no bit / burr in it.

As soon as I put in a burr and turn it on, it has an out-of-round vibration. It's almost not enough to see with your eye
but you can hear it and feel it, and when you try to put it to a surface to grind on, it jumps around in an unsafe manner.

The burr has a short 2-in shank and the diameter of the cutter head is only about 1/2 inch.

So the vibration must be from the burr. It was $23 twenty years ago and is brand new / undamaged.

Are the TIR tolerances that tight on a 26,000 RPM cutting burr ?

Where do you buy quality burrs these days that don't vibrate ?





Here’s a post we had on Abodiesonly about burrs. I will be buying more in the future

https://www.forabodiesonly.com/mopar/threads/killer-carbide-review-update-with-video.509680/page-3


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Livin and lovin life one day at a time




Re: Die grinder vibration problem [Re: pittsburghracer] #3043981
05/20/22 06:25 PM
05/20/22 06:25 PM
Joined: Jul 2006
Posts: 383
Essex, Ont., Canada
Fishmarket Offline
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Fishmarket  Offline
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Essex, Ont., Canada
I would get a new collet.


1972 Plymouth Cuda 340 4 speed 1971 Plymouth Road Runner 383 Auto 1970 Plymouth Duster /6 Auto
Re: Die grinder vibration problem [Re: Fishmarket] #3044329
05/22/22 02:32 PM
05/22/22 02:32 PM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
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north of coder
Originally Posted by Fishmarket
I would get a new collet.


that may very well be the way to go.
i have seen collets deformed by tightening up on undersized tooling shanks. this can also booger up the female receiving cavity, possibly rendering the tool useless unless the output shaft of the tool is replaced.
just my personal experience using these tools.
your mileage will vary.
beer

Re: Die grinder vibration problem [Re: moparx] #3044378
05/22/22 05:51 PM
05/22/22 05:51 PM
Joined: Jun 2016
Posts: 900
Washington
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hemienvy Offline OP
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hemienvy  Offline OP
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Washington
A new collet is is a good idea.







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