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A junkyard lathe and mill tool grinder

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vtsteam:
I spot welded two more strips of 1/8" x 1/2" to the top side of the slide. These will serve as slide guides for the tool holder, also seen in this photo. I've removed one of the original pieces from  the holder, as it's no longer needed.

vtsteam:
And here it is in use sharpening an acme threading tool:

S. Heslop:
Hey this is good. I was just thinking about how i'd grind an acme threading tool a couple days ago.

vtsteam:
It seems to work well Steve.

The X slide lets me use the whole disk, unlike the original Cleve jig. The Y slide allows me to apply pressure by hand which is a lot more sensitive than a mini leadscrew adjustment (I did consider a fancier version) and has the great advantage that you can pick the small tool holder right up off of the table and dip the tool end in water to cool it while grinding.

The rake of a cut is set by the original pivoting table, and the angle of the tool grind is set in the tool holder and its base/slide.

A paper sanding disk relieves worry about using the side of my regular bench grinder's disk, and I don't have to take shelter from it every time I start it, as normally recommended for a grinder. It will get used frequently as a result.

I'll get some better photographs of the sharpener tomorrow, and the resulting lathe tool -- it was nearly dark when i shot the last two pix.

Of course the slide could have all been milled from the solid -- a 3/8"  (10mm) thick piece of stock would have worked the same. And this could be adapted to just about any disk sander.

vtsteam:




Here's a test piece of scrap turned with the acme lathe tool sharpened with the new fixture. the threads are pretty good. The tool is a bit too wide at the tip -- so the threads are just a bit narrow at the tip and correspondingly wide at the root, but otherwise I was impressed with the first effort. Just a leetle beet more off the sides of the tool and the tip would be right.

It's difficult to measure the tool tip width without an acme gauge while grinding -- I'll probably end up making something to do a check with.

But very pleased with the first results.  :dremel:

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