Hand Made Knife Sharpening Jig





Introduction: Hand Made Knife Sharpening Jig

I have seen some jigs on the internet for giving a knife blank a "grind" or profile.  This is the step before the final edge that is used for cutting.   I have started to work scrap metal into knives, so I thought I would try my hand at making  one of these jigs.

I wanted it to 1)  fit my small work bench  / project  table,  2) be inexpensive, 3) be easy to construct, 4)  really work!

Step 1: Wooden Base Assembly

My first step was to gather some scraps of wood.  I had oak  on hand.  I think anything would work as long as it is not warped.  Plywood would be fine, too.

I cut the pieces to form a "T".

I cut the long  piece  to fit across my work table, so I could clamp the finished "T"  top and bottom.

A board was placed across the top of the "T"  pilot holes drilled, then screwed together.

Step 2: Metal Materials

I had some old shelf brackets around.  I knew I could use these to brace the jig in its final form.  But I needed two pieces of "L" shaped utility steel.  Found them at Lowes.

I used small boltds and nuts to fasten the braces to the "L" steel.

The view from the back shows how this gives a "U" shaped profile if viewed from above.

I used clamps to hold the entire assembly to the table.

Step 3: Knife Placement, Use of the Rod

I clamped a small portable vise over the long end of the wooden "T"  and over the table top to secure that end of the jig. 

Next, I screwed  my knife blank to a piece of wood, and placed this in the vise.

I used a 3/8" steel rod as the angle guide for the jig.

Place the rod in one of the jig holes and check for the desired grind angle.

Step 4: Placing and Using the File

To use the jig, place a metal file under the rod and on top of the knife.

By changing the placement of the rod in the hole, you can change the angle of the file "grind"

Step 5: Using the Jig 1

I made a knife blank from a circular saw blade. I put a fairly fine edge on the blade with sandpaper sharpening. I don't mind the time it takes. But the blade still didn't cut the way I wanted. The angle of the cutting edge and the over all profile of the blade edge didn't taper enough. The transition from edge to steel blade was too abrupt. My goal was to give the blade a more gradual transition. In my way of thinking about the blade, I needed to take some of the shoulder off the profile. First step was to mark the edge with marker. I didn't want to mess up the sharp edge that was already there.

I laid out the coarse and medium files I would be using.

I also added numbers to the holes in the jig so I could keep track of where I was in the sharpening steps.

Step 6: Using the Jig 2

I started in hole # 2 with the coarse file.

Someone asked if I taped the file to the rod.  No, I found that placing a hand on each end of the file was fine. 

In the next picture, I  hope you can see what the file was able to take away. The edge remains untouched.

Step 7: Using the Jig 3

I moved the rod up to the next hole and kept using the coarse file. In these steps I counted 12 strokes for each level, all the way up to #10. I kept watching to make sure that I still had a slight indication of marker.

Then I switched to the medium file and repeated the steps above.

Next I switched to a sandpaper -covered block.

Step 8: Finish

I could tell that it was working well as I repeated the steps with the sandpaper.

The blade was nicely reprofiled and ready for and sharpening for an even finer edge.

I could have also increased the grit and continued using the jig...




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How did you attach the file to the jig?¿

The file is only held by hand. I wear protective gloves, by holding the file with two hands it seems to work well for me.

Thats amazing! very creative!

Do you work down one side of the blade then flip it over and do the other side? If so, how do you make sure you are working eachside equally?

I file down to the center line of the steel edge.

Good Question
Yes. I can realign the blade after flip over by keeping the blade parallel to the edge of the block of wood. I eye ball the parallel aliignment.

I learned from my grandpa when I was young to use a stone by hand...not to be mean or anything but what if you need to sharpen your knives somewhere other than your workshop...I'd recommend buying some cheap knives dulling the hell out of them then learn to sharpen your knives on a stone by hand. It's a good skill to have. some interesting things you can use to sharpen your knives car Windows , the cocking serations on your glock ( the Austrian army does it all the time ) , ceramic pottery , and the bottom of certain glass bottles.

Great ideas. But this jig is used only to profile steel into the angle needed for a knife blade. After that I hand sharpen too

Thanks for your reply... I agree with you.

However I made the jig to profile the blade of hand made knives. This is sharpening in the most general sense. Not the final steps with I like to do by hand as you can read in the last photo of the Instructable: "Ready for hand sharpening / strop."