Instructables
Picture of A Simple Hollow Grinding Jig
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This is a jig I threw together from things in my shop that makes it easy to create hollow-ground knife bevels. I would have made an instructable out of it, but I don't have any pictures of the process and it's pretty easy to see how the thing goes together any way. The metal widget with the springs is there just to make sure the work rest (the piece of cherry with the c-clamp on top) doesn't move around and change the distance of the knife to the wheel. The c-clamp itself is cut down so I have a better view and control of the knife while grinding. I can also move it around to accommodate blades of different widths and thicknesses.

This jig could also work for with a bench grinder with a hard wheel. The roller that makes my hollow edge only has a 4-inch diameter, which is a little small for single edges...but it's the best I've got right now. And the blades end up devilishly sharp.

The last few images are of a knife I recently made with this jig, what I'm calling a "camp seax." Straight edges are easier. If you've seen my knifemaking Instructable, you can tell that I've greatly improved in a couple years.
bruce50006 months ago

check your messages like idea thanks

bruce50006 months ago

look down some show how to use a grinder

pfred2

jetboy1 year ago
can this be applied to a bench grinder?
Basta (author)  jetboy1 year ago
Definitely. It's a little beefier than the tool rests that come with most grinding wheels, too.
ripit2 years ago
just bein nosey here,is the base of yer jig a chunk of purpleheart?
Basta (author)  ripit2 years ago
yep!
reedje7772 years ago
I'd like an instructable on how to build your grinder. Where'd you get that?
fishcake273 years ago
hey basta, about how much did this cost completely?
Basta (author)  fishcake273 years ago
All I bought were the springs, the rest was scrap lying around...so I spent about $2.50. YMMV, especially if you don't weld. I'd guess about $20 for all materials.
thx... again
pfred23 years ago
I like it! How do you adjust your belt tracking?
Basta (author)  pfred23 years ago
There's a lever to the side of the platen that tilts it laterally--part of the grinder, though, not the jig.
pfred2 Basta3 years ago
Oh OK I thought you'd made the whole belt sander attachment I see it now you made the tool rest. I've made a few tool rests myself. I've modified this one a little more since this picture but this is the general idea:

http://img37.imageshack.us/img37/1992/pict0241.jpg

For hollow grinding chisel and plane blades mostly.

I made this other one first though sort of a proof of concept before I committed to doing it in steel:


GrindBench.jpg
pfred2 pfred23 years ago

I just found another picture of that tool rest more recent:

http://www.instructables.com/files/orig/F39/HOKU/GKGL5JHO/F39HOKUGKGL5JHO.jpg

I didn't know I could get the original resolution on this website of uploaded images.
caarntedd4 years ago
This is pretty good, and I think if you set this out as an instructable with notes to go with each of your pics, you would have a decent 'ible. None of your parts look difficult to make. Great work.