Balancing grinding wheels- my new page

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BadDog
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Re: Balancing grinding wheels- my new page

Post by BadDog » Thu May 16, 2019 3:46 pm

It does almost like something staining the wheel. But of course all the most useful information is obscured by the hub, and searching on what is visible proved unproductive. I guess it's not the end of the world to dismount, but I just dressed it, and I'm prone to making Lincoln squeal, so it offends my sensibilities to pull it down now. :oops:
Russ
Master Floor Sweeper

Harold_V
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Re: Balancing grinding wheels- my new page

Post by Harold_V » Thu May 16, 2019 3:50 pm

All in good time. When you do dismount the wheel, post what you learn. I read all posts, so I won't miss your words, and I'm not in a hurry. My surface grinder is not operational right now, anyway.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

Conrad_R_Hoffman
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Re: Balancing grinding wheels- my new page

Post by Conrad_R_Hoffman » Thu May 16, 2019 3:58 pm

Wlw, didn't know a grinding wheel could get the measles!
Conrad

1947 Logan 211 Lathe, Grizzly G1006 mill/drill, Clausing DP,
Boyar-Schultz 612H surface grinder, Sunnen hone, import
bandsaw, lots of measurement stuff, cutters, clutter & stuff.


"May the root sum of the squares of the Forces be with you."

Harold_V
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Re: Balancing grinding wheels- my new page

Post by Harold_V » Fri May 17, 2019 1:52 am

Yeah, real strange. I can't help but think it's something they do to the wheel so it is readily identified as being different from the conventional aluminum oxide types.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

spro
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Re: Balancing grinding wheels- my new page

Post by spro » Fri May 17, 2019 11:33 am

Makes sense, yet neither of us knows that wheel. I never even heard about a "Gel Wheel" until Russ posted.
Okay. You're ahead of me.

Conrad_R_Hoffman
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Re: Balancing grinding wheels- my new page

Post by Conrad_R_Hoffman » Sat May 18, 2019 7:00 pm

After talking to a machinist friend that I've worked with for almost 40 years, who's done a lot more grinding than I have, has never balanced a wheel and who thinks there's a good chance I'm out of my mind, I've changed the intro and justification a bit. Be sure to hit your refresh button if you read it again.
Conrad

1947 Logan 211 Lathe, Grizzly G1006 mill/drill, Clausing DP,
Boyar-Schultz 612H surface grinder, Sunnen hone, import
bandsaw, lots of measurement stuff, cutters, clutter & stuff.


"May the root sum of the squares of the Forces be with you."

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mcostello
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Re: Balancing grinding wheels- my new page

Post by mcostello » Sat May 18, 2019 8:19 pm

I have one that is in need of balancing and I am not out of My mind. He has just not run in to it yet. Maybe the Manufacturer forgot to balance this one.

Harold_V
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Re: Balancing grinding wheels- my new page

Post by Harold_V » Sun May 19, 2019 1:51 am

Sorry, but your machinist friend is wrong. While most wheels will run without issue, that's just not true of all wheels. Some run just fine out of the box, while others don't, some of them so bad they can't be used. Fact is, surface finish will suffer immeasurably with wheels that don't run balanced, and you are likely to struggle with size (those two features go hand in hand, and the tighter the tolerance, the more critical it becomes).

The problem with this is we have no idea to what his experience relates. Not to imply he isn't qualified, but a guy working in a shop that turns manhole covers and isn't the least bit familiar with tight tolerance and high expectations may well think it's nonsense, but the harsh reality is almost everything you can think of can lessen the quality of a grind. A single phase motor is a good example, as is a less than great running belt.

It is my opinion that you are performing at a level that is to be admired. Certainly not criticized. I've never regretted doing a job "too well", but have a few regrets for having glossed over a project.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

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GlennW
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Re: Balancing grinding wheels- my new page

Post by GlennW » Sun May 19, 2019 7:03 am

I've got a pretty expensive SG wheel that refuses to work. It made the machine vibrate when I first tried it so I balanced it, and it still leaves a choppy finish.

I finally gave up on it and will use it if I need a roughing wheel.
Glenn

Operating machines is perfectly safe......until you forget how dangerous it really is!

Conrad_R_Hoffman
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Re: Balancing grinding wheels- my new page

Post by Conrad_R_Hoffman » Sun May 19, 2019 2:18 pm

That sounds like my SG wheel! The only saving grace is that somebody else paid for it for a specific job. Once I balanced it and redressed, and you have to make sure to get it fully dressed, it worked well. IMO, not any better than my white wheels, but I don't do long run production grinding, which seems to be what the SG wheels are for. I think mine was an 80 grit, which means it's dense and can easily have bad balance. Once you got it balanced, was there any vibration detectable on the machine?

As for my machinist friend, he comes from the same environment I do, close tolerance lab and scientific stuff. All of it was fussy on cosmetics too. I'm pretty sure he spent many hours to achieve finishes that would have been way easier with a balanced system.
Conrad

1947 Logan 211 Lathe, Grizzly G1006 mill/drill, Clausing DP,
Boyar-Schultz 612H surface grinder, Sunnen hone, import
bandsaw, lots of measurement stuff, cutters, clutter & stuff.


"May the root sum of the squares of the Forces be with you."

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GlennW
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Re: Balancing grinding wheels- my new page

Post by GlennW » Sun May 19, 2019 2:35 pm

I gave up on it and used a different wheel.

I balanced and re-dressed, then balanced and re-dressed again (as re-dressing after balance can alter the balance) and it still left a choppy finish as if it was out of balance.

I don't recall if I could still feel any vibration though. It was a 3/4" wide wheel which I normally wouldn't use anyway, but needed the extra width. It was intended to be used to grind my chuck as the chuck is slightly wider than the Z travel on the machine.

SG wheels are not recommended for finish work in the first place, as they like to work hard. The Norton's SG's I have do leave a nice finish though.
Glenn

Operating machines is perfectly safe......until you forget how dangerous it really is!

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