Variable Speed bench grinder?? - Router Forums
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post #1 of 17 (permalink) Old 09-19-2010, 07:14 AM Thread Starter
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Default Variable Speed bench grinder??

Is there a variable speed bench grinder available? I bought ($5.00) a Craftsman and the thing scares me!! It just goes like hell, turning toward me, and I have a tough time trying to do anything other than use a wire brush wheel to clean stuff. I figured if I could CONTROL the speed my life would be easier. And safer!! I mean, I bumped that wire wheel with two fingers last week. Yikes! I lost enough skin to make a nice pair of moccasins!!
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post #2 of 17 (permalink) Old 09-19-2010, 07:32 AM
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Warren, by "turning toward me" do you mean it "walks" on your workbench? This is just the nature of the beast, the vibration of the spinning stones cause it to move. It needs to be mounted solidly. I screwed a board to the bottom of mine and just clamp it to the bench when I need it. And, yes, there are variable speed grinders available. I have an older VS Craftsman model but I use it full speed all the time anyway.

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post #3 of 17 (permalink) Old 09-19-2010, 09:13 AM
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Hi Warren

Pickup one of the motor speed control boxes they work on many motors..

Router Speed Control

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Is there a variable speed bench grinder available? I bought ($5.00) a Craftsman and the thing scares me!! It just goes like hell, turning toward me, and I have a tough time trying to do anything other than use a wire brush wheel to clean stuff. I figured if I could CONTROL the speed my life would be easier. And safer!! I mean, I bumped that wire wheel with two fingers last week. Yikes! I lost enough skin to make a nice pair of moccasins!!



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post #4 of 17 (permalink) Old 09-19-2010, 09:54 AM
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Hi Warren, I have a new Delta V/S grinder, works great. Robbie
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post #5 of 17 (permalink) Old 09-19-2010, 09:27 PM Thread Starter
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Okay you guys. Good ideas. Bob, like the idea of the speed control. By turning toward me I mean the wheels turn toward me and tend to slam the work down onto the tool rest. I am not very comfortable with that thing spinning like hell and me with a sharp chisel or knife in my hand!!
Thanks. I'll peek at the vs Delta.
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post #6 of 17 (permalink) Old 09-19-2010, 10:25 PM
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1) I promise you that you would be much less comfortable if the wheel spun the other way round.

2) Router variable speed box will *not* work on an induction motor such as is in the usual bench grinder.

3) Should you be getting someone to teach you how to use power tools safely?
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post #7 of 17 (permalink) Old 09-19-2010, 10:55 PM
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Hi

Would you call a router,Roto-Zip,drillpress,6" combo belt sander,Dremel a induction motor, it works on them...so why not the bench grinder..

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Originally Posted by crquack View Post
1) I promise you that you would be much less comfortable if the wheel spun the other way round.

2) Router variable speed box will *not* work on an induction motor such as is in the usual bench grinder.

3) Should you be getting someone to teach you how to use power tools safely?



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post #8 of 17 (permalink) Old 09-20-2010, 12:51 AM
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I must admit I was pretty horrified at the OP's comments. Bench grinders are fundamentally dangerous and should not be used without instruction.
Safety glasses are an absolute must for starters.
Grinding wheels can burst if not used correctly and big chunks of grindstone flying around can kill you. The glasses will only stop grit. They won't stop a chunk of stone flying through the air.
Bench grinders must be fixed down. You cannot expect to introduce a tool correctly to one if it can move around.
The tool rest should be set close up to, but not touching, the wheel, otherwise the tool can wedge between the wheel and the tool rest with a liklihood of the wheel bursting.
Grinding should not be done on the side of the wheel unless you are very familiar with grinding, as wheels are only intended for edge grinding and undue lateral pressure can cause a wheel to burst.
The protective shields on most grinders are pretty flimsy and unlikely to stop all of a bursting wheel. They are a last resort. Better working safely so the thing doesn't burst in the first place.
The speed of the wheel is the least of the problems.

Cheers

Peter
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post #9 of 17 (permalink) Old 09-20-2010, 07:56 AM Thread Starter
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Default CRQuck may be right

Quote:
Originally Posted by crquack View Post
1) I promise you that you would be much less comfortable if the wheel spun the other way round.

2) Router variable speed box will *not* work on an induction motor such as is in the usual bench grinder.

3) Should you be getting someone to teach you how to use power tools safely?

Well, you might be right about that. There is a good "tool" place near me, in fact I am headed there this morning and I intend to have a long heart-to-heart talk with a certified expert in this field.
It might be that I just don't LIKE this grinder. I have no trouble with tablesaw, router table, big drill press and other assorted mechanical things but there is something about the way that grinder seems about to run amok that makes me nervous. I would be more comfortable if it turned SLOWER.
I have a couple outboard's that will run at 6500 RPM.....but I don't need to go across water THAT fast so I dial them down to 4500 and get there with no moments of high anxiety.
Thanks.
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post #10 of 17 (permalink) Old 09-20-2010, 09:11 AM
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Quote:
Originally Posted by robersonjr View Post
Hi Warren, I have a new Delta V/S grinder, works great. Robbie
So do I. It's a 6", but there is also an 8" available. Real handy to have the VS.

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