Knife Grinder Table part 2

J

jawilder

Joined
Jun 27, 2006
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I started a thread a few weeks ago about a mysterious contraption called a "Knife Grinder Table" here http://www.bladeforums.com/forums/showthread.php?t=750363

Here are some pictures of it. It comes with extra stones and I was just wondering if something like this was worth having as a maker?

The motor is 3600 rpm and not able to slow down. There is no vice or current way to hold down a workpiece.

I'm wondering if I could turn it into a metal lathe of some sorts since the motor moves up and down and I could put a bench drill vice on it... or would the motor still be too fast for use?

I can pick it up for around $70 from the guy who owns it...

Thoughts requested:confused:

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Jason
 
As noted in the other thread, what you have is the remains of an old planer or shear blade grinder.

Yes, you could mount an X/Y table of some sort under the wheel, but all you'd be able to do is grind straight edges, and not as precisely as an actual surface grinder. You'd also have to protect the table from the grinding grit, or you'd wear it out in short order, losing what little accuracy the thing had in the first place.

Even with some sort of fixturing to hold a blade, you wouldn't be able to do heavy stock removal- you'd basically just be using a bench grinder up on end.

I can't think of a whole lotta use for it, apart from, well, sharpening light, straight-edged blades, like planer and shear knives.

Also keep in mind the motor's semi-open framed; it'll draw dust and grit through unless well guarded.

Doc.
 
it would work fine as a surface grinder but I would probably take it off the frame and see if I could take off the disk holder or whatever that is and put on a pulley system to use it as a grinder motor. A couple of step down pulleys would lower the speed on the grinder end. Keep it out of the dust or at least clean it once in a while and it should be fine. Its 3600 rpm but what hp?
 
Think of it this way: You're buying a table, a motor with an arbor to which you can attach certain kinds of stones, and a column mount with some sort of height adjustment mechanism.

The table is nothing spectacular, might be decent as a low, heavy workbench.

Motors are a dime a dozen. Half-horse single-phase motors can be found easily, often even extracted for free from junked appliances. The arbor is also nothing special- there's way to mount stones to virtually any shaft.

That leaves the height adjustment column. Unless you need it or have some use for it, even $75 is a lot to pay.

Doc.
 
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