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Tool Talk Discussion Forum

Sizing Bench Grinders

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Keith Ward

06-06-2005 18:49:50




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Just looking for thoughts on how to size a bench grinder. For the most part I would like something that is for "average" use, that is nothing too small and certainly nothing oversized like a 12" 3HP!

I cannot cite any particular project at the moment but plan on outfitting my shop with a piece at a time as needed and as the budget will allow. I also don't just buy junk from any old place and then have to replace it every 6 months. So I'm not necessarly looking for recommendations on brand names but listing favorites here will help. I suppose if the sky is the limit I would go with a Baldor or similar.

With so many wheel sizes and HP ratings its sort of hard to know what is most important and flexible. I can safely say that it would be nice to have something that could just do the job and not have to be babied alone so I'm guessing on 3/4 to 1 HP with a 6" wheel. What do you all think?

Keith

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Cliff(VA)

06-11-2005 03:56:24




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
I have had several grinders. I burned up my 6" used, homeowner grade, Baldor polishing brass. I had bought it for $15 at an auction.

But my real find was a 7" 1800 rpm Baldor Industrial. I paid $60 for it at auction. It sounds like an aircraft engine starting up. Runs smooth as silk. But I never get to use it very much, because once I start grinding, I'm done. What a jewel.

You might want to track the auctions and sales for a while and see if you can find an industrial quality grinder. Mine sure is better than ANY other grinder I have ever used at work or at home. The trick with auctions is to be able to evaluate the condition of the item, be able to figure out a value, and be able to walk away when it gets too expensive.

Good Luck!

Cliff (VA)

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Scott Green

06-07-2005 18:23:27




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
Funny thing , I've been doing my own reserch on the very thing your interested in. An all around middle of line bench grinder. Things to think about when looking for this grinder. Wheel diameter , tool rest , RPM'S , amps , lighting , and distance between wheels , cost , etc. The grinder I come up with to be about the best middle of the line , with all the above features is the Craftsman variable speed , 8" (1 - white wheel , & 1 - grey wheel). And yes , the grinding wheels on the china made bench grinders are nothing to brag about. But they can be replaced. I have a belt grinder. Very handy! Jet makes a belt / wheel grinder combo. But I'm not impressed with the tool rest.

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Scott Green

06-08-2005 17:00:24




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 Re: Sizing Bench Grinders in reply to Scott Green, 06-07-2005 18:23:27  
I ment to say Delta 8" variable speed , not Craftsman. Craftsman does have an 8" variable speed , but is hard to find. Besides , I believe it too is made by Delta.



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Keith Ward

06-07-2005 10:15:52




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
I have also noticed that depending on who you buy from that various RPMS are available, like 1800 and 3600. I suppose a lower RPM would remove less and help the work stay cooler if necessary, right?



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Rauville

06-07-2005 08:01:53




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
A 8" diameter grinder is probably plenty for most shops, but be sure and get a grinder with long shafts. A decent distance between the wheel and the motor makes most jobs much easier.



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MAC,IL

06-07-2005 06:01:32




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
Many years ago I got an 8" B%D model. Its plenty for general use. But I use norton stones. Place I worked years ago had 2---2X12 stones. That was a real heavy duty grinder.



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Matt from CT

06-07-2005 13:35:38




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 LOL... in reply to MAC,IL, 06-07-2005 06:01:32  
>2---2X12 stones. That was a real heavy duty >grinder.

Years ago I worked for Norton...albeit at a Ceramics division R&D center just outside of it's hometown of Worcester.

One of the "legendary" products is a grinding wheel made special order for one customer -- I believe they where a structural steel foundery.

That it's a 48" wheel wasn't so extraordinary...

It's that when the customer uses them against whatever it is they're making, they get 2-1/2 cuts per wheel. Then chuck it in the junk pile and mount a new one.

Didn't use too many of them...but the salesmen smiled when the order came in. Niche product essentially made short-line on a production line and they paid for it.

Though I wasn't involved with the abrasives & ceramics technology (I'm computers), it was a fascinating place to see what could be done with that stuff and how far beyond "normal" thinking about ceramics you could push stuff. Some of the failures where interesting, too!

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Nolan

06-07-2005 05:03:02




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
I would go with an 8" wheel, or even larger if I could handle it in the shop. You'll never complain about having too much grinder, but you sure will about having too little grinder.

In bench grinders, you do seem to get what you pay for. A cheap 1hp grinder from Harbor Freight or the like will have much less power than a 1hp grinder from Dayton and the like.



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Slowpoke

06-07-2005 00:47:42




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
Whatever you decide about size (I like 8" wheels), be sure the tool rests are solid and easy to adjust. Stay away from the stamped steel rests and supports as they will bend out of shape with time.



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Davis in SC

06-06-2005 19:14:59




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
I think an 8 inch is about the right size for most use. The Baldors sure are nice..... The biggest problem with the import grinders is that the wheels are not good. Replace the wheels, & the import grinders are OK. for most uses. The ones that come on new grinders are way too hard of a bond. They grind too hot , because they load up, & do not break down to expose fresh abrasive grains. Best bet is to use good wheels like Norton, less risk of wheel exploding. I was at an auction a few years ago, crowd was slow to bid on first few items... A like-new 6-inch Baldor with a Baldor pedastal stand came up, I bid 25, auctioneer said 'Sold" !!! He said that will get the crowd bidding. The next item was just a Baldor pedastal, it brought 75.00 I got a bargain that day

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dr.sportster

06-07-2005 13:47:19




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 Re: Sizing Bench Grinders in reply to Davis in SC, 06-06-2005 19:14:59  
Davis, you are describing the grinding wheels on my Dewalt to a T.They dont seem to expose new grains as you said .I have noticed that poor feature of the wheels.



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dr.sportster

06-06-2005 19:00:53




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 Re: Sizing Bench Grinders in reply to Keith Ward, 06-06-2005 18:49:50  
Check out the Dewalt[China]it did not have a horsepower rating just an amp spec but I calculated it to be .6 HP.Its not as big as I went to buy but it was $115 and has been good so far for general use.It was also the only one a store called Tooltown had in stock and I needed it that day.I know Made in China is not saying alot but I try to buy American tools.Oh well.I was looking to buy a 1 horse USA made grinder and had 300 bucks burning a hole in my pocket.Look at it and see if it suits your needs.I am happy so far since last summer anyway.Good luck.

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dr.sportster

06-06-2005 19:07:49




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 Re: Sizing Bench Grinders in reply to dr.sportster, 06-06-2005 19:00:53  
Wait I disagree with myself.[Im a schitzophrenic and so am I].You said it right yourself Baldor 8 inch wheels fine and course.Thats what I went to go buy when I got a Chinese Dewalt.What was I thinking.



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Ol Chief

06-06-2005 20:10:00




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 Re: Sizing Bench Grinders in reply to dr.sportster, 06-06-2005 19:07:49  
I think American first of all and then think 8 inch is an all round good size.Baldor comes to mind as a sturdy machine.Might suggest you shop the net for used machine tool dealers to find a solid and thrifty purchase.



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