All that stuff matters. What you need depends on what you want to grind. Are you heavy into metal working? Knife sharpening? Automotive tinkering? Tool sharpening?
No matter what you buy, get a decent pair of safety glasses or a face shield to wear when you use it.
6" is plenty for typical home use. You need a face mask for good protection. Still won't protect you if you let what you're grinding fly. So the tool rest is what I look at first. Some are really lousy with wingnuts/connectors that come loose or are hard to adjust. After that I like a light and water tray. Any container does for water though, since you usually fetch water because the tray dried up. A tray attached to the grinder is more handy.
Face shield! I'm not saying I never grind with just safety glasses-- but face sheilds are a much better habit to start right from the gitgo.
Eyesight is paramount-- but having a 4" long hunk of metal sticking through your upper lip is no fun at all.- a good grinder will be able to toss some pretty sizeable crap at your face.
Jim [the 8"(6?) dual wheel grinder I got at Harbor Freight for about $40 is one of my *few* dissapointments from them- It is powerless- the stand is nice, though]
Personally, I wouldn't even bother with a bench grinder. A 4" belt sander is more practical and useful. When I was a machinist, the grinder gathered cobwebs while our Baldor belt sander was in constant use. Metal, plastic, wood, tools, drill bits, etc. The only thing the grinder got used for was grinding special lathe bits. Now, most ppl don't even know how to grind a lathe bit. A good belt sander like a Baldor is gonna cost ya', unless you buy used, but it's worth every penny. It'll see more use than any bench/power tool in your shop.
A friend of a friend used the friend of the second part's grinder, complete with 3/4 metal wheel shields and protective glasses. That didn't stop the wheel itself from shattering and launching itself into the friend of the first part's face. End result, first-part-friend lived, but was no longer first choice on the bar scene.
Years ago I saw a wheel come apart... luckily no one was hurt or injured. Scared hell out of me...
It was obvious beyond a shadow of a doubt, that more than lethal kinetic energy was released... even in the smaller wheel chunks.
To this day I give all grinders a lot of respect, and try to never be in line with a spinning wheel.
I suggest buying a 'real' grinder and wheels... neither of which will likely be found in a big box outfit. Also, read, heed, understand and follow all safety precautions... every time you use it. Also, secure from from kids, morons and/or anyone else likely to cause an accident.
Even a belt sander will kick the work good enough to draw blood, but a belt is not likely to take out bones and major organs. The only advantage I see to a grinder is using a wire wheel, but even then it spins a wire wheel fast enough to make heavy wire extremely dangerous. Gimme a brass wire wheel in a 3/8" drill motor. Slower, but mucho safer.
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