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Bench Grinder, High or Low speed?

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Dum ole Bob

03-19-2001 07:33:52




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What's the difference in a "high" speed or "low" speed bench grinder? (Other than one turns faster than the other.....). I understand "they" say the low speed results in less heat, but from the practical point of view WHAT determines which one a guy should have???
As always you smart guys helping us dum guys is super! Thanks!




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dumolebob

04-15-2001 08:47:58




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 Re: Bench Grinder, High or Low speed? in reply to Dum ole Bob, 03-19-2001 07:33:52  
Ok, I followed the advice & got a new, 1 hp, 10" Delta grinder on Ebay for about $150. It is something! Push the work into it as hard as you can - it won't bog down. It grinds & grinds & grinds! I don't know what to do with my old Harbor Fgt, 6" grinder - maybe use it to do toe nails!



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Fred OH

03-20-2001 09:51:47




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 Re: Bench Grinder, High or Low speed? in reply to Dum ole Bob, 03-19-2001 07:33:52  
Bob, I'm gonna read between the lines and assume that you mean the difference between a 1750 rpm and a 3450 rpm bench grinder. The main reason to me that they have both is to maintain around the 4000+ to 5000+ surface feet per minute range for the wheels. They cut best in that speed range. Too slow of a speed and the wheel acts too soft, breaks down too quick. Too fast of a speed and there is a danger of the wheel flying apart and injuring someone and tearing up the machine.
My advice on buying a bench grinder for general purpose grinding would be to buy the one with the most horsepower so it won't slow down as you are grinding on something and you have to wait on it to catch back up. It's kinda hard to sharpen a twist drill on a grinder that you grind angle iron on too. You can keep separate wheels for this, but be careful when changing wheels and check the new wheel by holding it on your index finger and tapping around the wheel with a hammer handle listening for a ringing sound. If it sounds more like a thud, then don't use it. And as always, stand aside as the wheel comes up to speed and comes down from speed as that's when most of them explode and disintegrate and you definately don't want to be in front of one in that situation. Now your not dum ole Bob anymore, you know as much as I do. L8R----Fred OH

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Scott Green

03-20-2001 05:03:02




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 Re: Bench Grinder, High or Low speed? in reply to Dum ole Bob, 03-19-2001 07:33:52  
Bob , I too would choose the slow one as I use it for sharpening / grinding , and do not want heat build up. I find that a person is much better off in most cases to buy a good belt sander. You will use a good belt sander much more than a bench grinder. Of the two , I would choose the belt sander. But of course a belt sander and a slow running bench grinder is a nice set up.



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Rod MI

03-19-2001 23:08:05




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 Re: Bench Grinder, High or Low speed? in reply to Dum ole Bob, 03-19-2001 07:33:52  
Bob by the slow one it will give you more control for precision work and for tool bites I usually start the grinder then turn it off then grind my drill and cutting bites to final shape if you knead more stock removal just by a courser wheel



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VaTom

03-19-2001 17:52:14




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 Re: Bench Grinder, High or Low speed? in reply to Dum ole Bob, 03-19-2001 07:33:52  
Umm, Bob, don't forget how much this advice is costing you. Sometimes worth just about that much. But here we go. I use a slow one for tool steel. Like sharpening drill bits. Another one is set up faster for quick stock removal of mild steel. If I could only have one, it would be slow. But I'm a pretty patient guy and my drill bits and chisels would be the most important.



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