OT: Thoughts on this benchgrinder?

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awp101
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OT: Thoughts on this benchgrinder?

Post by awp101 »

http://www.northerntool.com/shop/tools/ ... 478_120478
Image
1/2 HP motor - 120V, 60 Hz
Operates at 3400 RPM
6in. x 3/4in. grinding wheel
1/2in. arbor
1 year residential/90 day commercial warranty

I need a different belt sander (a 4" works...sort of....) and I don't have a bench grinder at all. Poking around the Northern Tool website, I found this one. By the reviews it appears you need to make sure the belt is running true but that was the only major, consistent complaint I found.

Has anyone used this? I'll be working on scales to begin with but would like to eventually move into blademaking using the stock removal method since a forge is a no-go for the foreseeable future. Not to mention the funds and space are equally limited.

There's a NT close to the house so it wouldn't be a blind internet purchase.

Thanks! :mrgreen:
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O.S.O.K.
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Re: OT: Thoughts on this benchgrinder?

Post by O.S.O.K. »

I personally would avoid that. I've learned to buy single purpose things. Get a grinder and a sander is my advice.
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Rusty
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Re: OT: Thoughts on this benchgrinder?

Post by Rusty »

3400 RPMs for a grinder?? Isn't that a bit fast? I thought the standard operating speed for electric motors was something like 1750.
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Chuck 100 yd
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Re: OT: Thoughts on this benchgrinder?

Post by Chuck 100 yd »

Most grinders run 3650 rpm but that is way to fast for a belt sander IMHO. I agree. get a grinder and get a sander. Don`t get a combo. I have two of each. My 6"x48" belt sander with a 12" disc sander on the side is great for many things like recoil p[ads. The grinder needs to be mounted higher for comfort and safety than the belt sander. :D
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Hawkeye2
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Re: OT: Thoughts on this benchgrinder?

Post by Hawkeye2 »

"We are not impressed" Stalls easy. You have to push it to help it start. Doesn't want to start when it is cold. Take a serious look at the reviews and not the number of stars. Bench grinders have a short life if you drag the RPMs down while working it, this is much more true with cheap ones and you can't do good work with a grinder/sander that vibrates.
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pokey
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Re: OT: Thoughts on this benchgrinder?

Post by pokey »

pass.

i've got several grinder/buffers for heavy work, but i use this kind of machine
a whole lot more than any wheel grinder for shaping/sharpening etc.

http://www.harborfreight.com/cpi/ctaf/d ... umber=2485

then save up and get something like this maybe?

http://www.harborfreight.com/cpi/ctaf/d ... mber=97181

much more useful imho. :wink:

if you need a wheel grinder, rip the motor out of an old washer and add these.

http://losangeles.craigslist.org/sgv/tl ... 56658.html

good luck :D
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Mutt
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Re: OT: Thoughts on this benchgrinder?

Post by Mutt »

I've had the old washer made grinder since the '60's . Have always needed to roll the stone to get it started , plus if I hold too much pressure the wheel will stop . But the old girl still is as good as always. Just can't get in a hurry , and it does all I need it for. Even sharpens my tractor blades.

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awp101
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Re: OT: Thoughts on this benchgrinder?

Post by awp101 »

Thanks all!

This was just the first one that popped up when I got the urge to look for something. I'm not a huge fan of combo units but I figured it was at least worth asking about.

pokey: the Grizzly 1"x30" came up on another forum. The Grizzly unit looks suspiciously identical to the HF unit but is another $20. I have a HF on the way home from work, I don't have that option with Grizzly. Hmmm, need to ponder this one...

I already have a Ryobi 4" belt sander/6" or 8" disc sander combo. The 4" is too wide for some applications so I need something smaller.

AFA the washing machine motor grinder, I've given that serious thought. Wayne Goddard's $50 Knife Shop shows the one he's used for years (The Good News Grinder), I just need to figure out how to set it up for direct power. I'm up to my shins in washing machine motors at work as it is.... :lol:
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Re: OT: Thoughts on this benchgrinder?

Post by KCSO »

What are you going to use it for, home use, knife making, general shop work? I have currently 6 different grinders and a surface grinder and each has a different purpose. i can't comment on the specific brand but a friend has a Grizzly like that that he uses for working knife guards and he likes it. For general shop use I would want a grinder with a medium wheel and a wire wheel first. 3450 is becoming the standard speed for a lot of grinders and polishing wheels, I prefer the old 1750's as they aren't quite so grabby when polishing but either one is a whole lot better than a wire brush and sandpaper. Well, let me take part of that back as I have seen some folks who's best efforts at knife throwing started with a grinder. You will need to either surface grind or glue on a new platten for quality work as I have yet to see a cheap factory sander/grinder with a really flat platten.
awp101
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Re: OT: Thoughts on this benchgrinder?

Post by awp101 »

KCSO, as far as the belt sander it would be used for primarily shaping knife scales and polishing duties. The grinder would be for blade shaping and as another polishing option with a polishing wheel.

Right now I'm seriously thinking about that HF/Grizzly 1"x30" sander and a separate grinder.
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bcp
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Re: OT: Thoughts on this benchgrinder?

Post by bcp »

For any grinder:

Make sure the motor diameter is smaller than the wheel diameter. Some aren't, and that limits where you can grind on some items.

I don't have a need for two grinding wheel grits, so I replace one grinding wheel with a
wire brush wheel.

Arrange good lighting, and good eye shielding, especially with a wire wheel.

Bruce
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Re: OT: Thoughts on this benchgrinder?

Post by KCSO »

That's what I would do. My friends who studied with bill Moran uses a makita 4" to rough out his blades and then draw files them before tempering. he claims he gets a nicer line by draw filing.
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Warhawk
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Re: OT: Thoughts on this benchgrinder?

Post by Warhawk »

I recently bought one of these
http://www.woodcraft.com/Catalog/Produc ... 94e199c08f

And a set of paperwheels, for knife sharpening
http://www.woodcraft.com/Catalog/Produc ... rodid=2254

So far so good, I like the dual speed option.
Charles
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Re: OT: Thoughts on this benchgrinder?

Post by Charles »

I agree with others about dual use tools. There is always a conflict in purpose and something loses out. Jet make a nifty 8" 1hp grinder. I keep a medium wheel on one side and a medium or fine wire wheel on the other. It is a heavy duty machine that will last a lifetime and it is low in cost.

If you want a belt grinder/polisher then go with the Burr King or Square Wheel. These are professional units and quite pricey but they are what the pros mostly use.
stretch
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Re: OT: Thoughts on this benchgrinder?

Post by stretch »

What bcp said. One side a grinder, and one a wire wheel. You'd
be surprised how useful the wire wheel is.

If you want a sander, too - buy one with a disc sander on one side
and a belt sander on the other.

That's my advice and you can ignore it or not as you wish! :lol:

-Stretch
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