Sharpening very dull knives with a bevel jig?

[brasileiro]

I use something like edge pro apex.

And sic (silicon carbide stones). Here where I live this stones are cheap and I can reprofile something like 2x 8~10 6"~8" blades. It's because I split the stone in 2 to fit the jig. This stone is Saint Gobain brand.
And it takes time. Don't put extreme pressure on it. More strokes and less pressure is the key to perfection.
The arm with sic at 20 degrees setup (90 degrees from the post) weight 0,190 kilos (6,7 oz). I maybe work with 1~1,5 kilos (35~52 oz) of pressure when using coarse side of stone.

But if the blades are really dull, then I go to beltsander first. But beware, the beltsander is a metal eater.
This is for cheap inexpensive blades. For that ones is more expensive I just use the jig and Japanese whetstone.
Im not a master of mirror edge but I'm learning this way.
By the way, someone in forum post this link but I can't remember who and where. Give a look: https://hubpages.com/food/Make-your...arp-by-removing-metal-contaminates-from-edges

 

[singularity35]

I wouldn't waste my time using an Edge Pro on a cheap kitchen knife. Way too long. I'd just use a big grit stone, and scrub with a little pressure until I get a burr. Maybe takes 10 minutes to flip the burr. Then I clean it up with a finer grit stone, still scrubbing hard. Then flip the burr, and clean up with lighter and lighter pressure.

Quick and dirty for my cheap kitchen knives. I'd rather spend the time cooking than sharpening.

 

[tiguy7]

I sharpen cheap knives on the belt grinder and finish by stropping on the back (inside) of the belt, edge trailing.

 

[Zombie411]

TiGuy,
You are a 100% inspiration to a neophyte.
From what I have read in the past 2 months (not all here) a knife smith will make most of his own tooling.
I think this is a throw-back to black smithing when a fella HAD to make his own tools.

Heck. If there were ready made tools... there would be no need for a black smith.
Actually I just hurt my brain... Chicken or egg?


brasileiro,

Is that a homemade system?
Kudos if it is. If not where did it come from?

 

[tiguy7]

The hand sharpening jig is homemade. 2 1/2" X1/2" Aluminum bar stock, a couple of door hinges, some hex bar stock, 2 tie rod ends (R&L threaded), 2 jamb nuts, some 1" X 3" X1/8" box channel (slit after being drilled), and a few nuts and bolts. I set the angles the same as the Spyderco Sharp Maker. I often start a knife on my jig and finish up on the S/M. I made the jig because I suck at guessing the angle at which I am holding a knife, but it is quite easy to point the edge at the floor. I also did not have the patience to reprofile wear resistant blades on the S/M.
My original idea was to move the knife back and forth from one side of the jig to the other. The problem there is you cannot tell if a burr is developing. A burr lets you know if your bevel goes all the way to the apex of the edge. So I set one side of the jig to 75 degrees and the other side to 70 degrees. I grind a while on the 75 side, counting strokes, then rotate the jig 180 degrees and put the same number of strokes on the other side of the blade. Counting strokes keeps the edge centered. After both bevels are extended to edge apex on the coarse stone, I shine up the tapers using successively finer stones. At the end of the process, I very lightly deburr the edge on the 70 slope using the finest stone. Talking weight of the knife here. If I need to deburr a knife sharpened on the 70 slope, I put a block under the 75 side and change the 70 to a 65. I use the 70 side for camp knives and choppers.

 

[brasileiro]

Is that a homemade system?

Yes, it is. Thanks Zombie411. I don't have many tools around my geographic position like cnc... but I build it and it works for me. Have a little large base cuz sometimes I use to sharp machetes and works for stability issues when sharpening both extremes of the blade.
I don't use to move the blade like some edge pro users do. Saying that, a large front base fits like a glove. If you were interesting in some more details write inbox and I take the measures for you.
Some more pictures are in this post:
https://www.bladeforums.com/posts/17279178/

 

[Zombie411]

Amazing...
I've noticed that almost everyone that likes the results they get has a "pattern" they follow.

I'm still learning. Not how to sharpen but how to sharpen efficiently. I can only hope that (like you, and others) I will develop the tools, and "pattern" that works best for me.

Here's to hope!