PowerPro as a slow speed grinding wheel?

[benush26]

Is anyone using the PowerPro's really slow speed and possibly designed a jig (like the Oneway Wolverine) for lathes chisels (maybe even badly dulled bench chisels)? If 700 rpm on a 500 is available, think how cool you could keep the metal at 250 rpm on the PowerPro!!

I have the SS sharpening guide and an 12" sanding disc with aluminum oxide just for sharpeing, but an 8" grinding wheel set up for an afternoon of getting edges really SHARP sounds fun!!

Okay, so I am like the kid in the candy store and am thinking of ALL the fun things I can accomplish (and maybe a wee bit of rationalization about the price for a PowerPro ), but I can envision a stand resting on the tubes, clamped in place (motor in reverse - but how to include a water bath for the wheel??) and hardly any sparks flying off so I don't have to worry about keeping tool steel cool!

Yup it's late and no one should let me anywhere near a computer late at night (actually most anytime is probably dangerous! But since there is no one to stop me.....(divorce has it's up sides).

Anyway, any great ideas, or already designed and in place, on how to set up the grinding wheels to make a grinding station?

And yes, I do know that SS has a guard to use with wheels, but it was for smaller wheels.

[pennview]

Try this web site -- http://eddiecastelin.com/sharing_information -- He sells his version of a Wolverine set-up, but also provides details on how to build one yourself. He has over 150 videos on lathe turning on you-tube that are very well done.

[terrydowning]

Yeah, Cap'n Eddie calls his the "Black hawk" system. Another of those "one of these days" items for me.

The first edition of PTWFE also has a section on sharpening and sharpening jigs that can be made for the SS. Those sections have been modified over the years with the inclusion of Shopsmith's various sharpening jigs that they sell. MY PTWFE also has plans for making a grinder safety cover as it was printed before SS sold their own version. If you can get your hands on an earlier edition of the PTWFE there are lots of ideas and jigs in there that are not in newer versions.

[benush26]

To Both Art and Terry, Thank you!

A friend had pointed to Captain Eddi's 2 dollar jig, but I had no idea about the website. What a gold mine!

Terry, I'll start check with those that I know for older versions of the book (I'm fairly certain my version is 4). I do have a rough idea of what I might try but I like those who have already invented the wheel and show me where 3 steps is usually better than 20!

Thanks again,

Ben

[allsas]

I built a prototype and four simplified grinding jigs because the SS at slow - 700 rpm would be an ideal platform for grinding w/o overheating the chisels and blades.

I used it on some wood hand planes from an estate auction. It worked great on the blades, getting them to work, producing thin wood curls from the full length of the test board.

The jig was designed to sharpen bowl chisels with the Ellsworth Bowl (parabolic) Grind. My inexperience w/sharpening bowl gouges has slowed me down and I feel very uncomfortable telling anyone that this is the jig to use to grind bowl gouges. If it produced perfect grinds, I wouldn't know it. The enthusiasm and interest in using the SS to grind chisels made me post because the effort and cost to make a grinding accessory is low cost, low tech, but you're going have to develop the skill to actually sharpen chisels.

The additions to the setup for sharpening bowl gouges is maybe a longer bar (1 x 3 with 3/8" rabbets on the sides) and a jig to guide the bowl gouge, rotating it on the surface of the grinding wheel. Cap'n Eddie has the details of the bowl gouge jig, but an even simpler one can be made w/ a carriage bolt and a small hardwood block, no welding!

Using a grind stone to sharpen chisels has a lot of proponents and experience for guidance. The low speed available from the Mark 5 - V's is better than 99% of the grinders that you can buy. Most of the swarf from grinding fell on the tool rest and tool rest pillar, but a towel over the way tubes make cleanup easy.

I have a dimensioned and labeled Google Sketchup file of the Grinding Jig w/tool rest for grinding plane irons, Capt'n Eddie has the dimensions of the Bowl Gouge Jig, the geometry of the tool rests for the bowl gouge, and videos showing how to sharpen lathe chisels.

The grinding jig is so DAMN simple that anyone can build it because its made with a 1 x 3, 11" of 2 x 6, 10 " of 2 x 4, plus scraps of 1/4" plywood or hardboard. For $5, you should be able to sharpen lathe chisels and plane irons.



>>>>>>>>>>>>>>>>>>>>>>>> Updated 2/5/13

Link topublic folderon Skydrive. Now with Build Notes.

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[pennview]

I'd be interested in seeing your sharpening jig.

While I don't know how you shrink a Sketchup file, here is one method that will allow you to post your drawing here on the forum.

Display the drawing on your computer screen and then copy it to the clipboard by holding down the "Ctrl" key and then pressing the "Prt Scr" key.

Open IrfanView, a program that you download for free from this site -- http://www.irfanview.com/

Hold down the "Ctrl" key and then press the "V" key to paste the image in the clipboard to Irfanview.

From the drop down menu, select "Image" and then "Resize/Resample" (or simply hold down the "Ctrl" key and press the "R" key.

On the right side of the menu select "800 x 600" from the list of new sizes and then press "OK".

Save the new image to the desktop and then upload it to the forum.

[marballizer1]

allsas, I would like to get the grinding jig plans from you. I have been thinking about using the Shopsmith as a slow-speed grinder for a few months, just couldn't figure out how to do it.

[marballizer1]

Thanks allsas! Checked it out and it looks great, I'll get around to building it sometime.

[randyrls]

I have a dimensioned and labeled Google Sketchup file of the Grinding Jig w/tool rest for grinding plane irons, Capt'n Eddie has the dimensions of the Bowl Gouge Jig, the geometry of the tool rests for the bowl gouge, and videos showing how to sharpen lathe chisels.

In Sketchup, Just select "Export", and "2D Graphic" to create a JPG that you can post. It will be an exact image of your screen.