Removing steel from the spine at the tip

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labor of love

labor of love

Cowboys from Hell
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I have this blade that I’m looking to modify. I want to take off 5-10mm from the tip area and take a lot of steel off the spine. Basically, the tip is too high. I can lower the profile by recreating a new lower tip by taking off some of the curve right before tip.
Does that make sense?
Anyway, I plan I’m using 240grit+320grit stones to do this. Any advice would be much appreciated.
 
The tracing on the right is what I’m attempting to do.
3FF73F8D-E02A-4205-A3D1-FEC626D7D34D.jpeg
 
Hey, drawing it is the hard part, it’s a cake walk from here. ;)

I’ve done this on a few cheap knives. Generally you’ll want to start by moving the spine on the stone in the direction perpendicular to the face of the knife to remove as much metal as fast as possible. 90 degree angle to the stone would be fine, I suppose, although I usually find it easier to do like a 60 degree angle and alternate sides. This can leave the spine faceted, so you’ll also want to do some breadknifing of the spine to remove faceting and help get the exact curve you want. You’ll also need to round the spine afterwards to make it not look like ****. I usually do this starting on a stone, and then I switch over to the shoe shine sandpaper method. You will probably need to do some thinning near the tip afterwards, too, since the convexity of a knife often decreases towards the tip.
 
To do most of the work, use a brick instead. It's going to eat through your stones very fast unless they're diamond Feel free to draw on the knife (if you weren't already planning to), and be sure to check your work, as you can't put metal back on.

I've done this many times on both stones and grinders. I like to work small sections at a time, then do blending strokes to make sure everything isn't jagged, and finish by deburring and easing the corners.
 
labor of love said:
Is there any trick to keeping a proper curve to the spine above the tip? I guess just reshaping after the steel is removed.
Click to expand...

That’s not hard to do with breadknifing, in my experience. It’ll make your job easier if you try to make it as smoothly curvy as possible in the first step, though.

Obviously I’m not the one to listen to in this thread though. :)
 
The Edge said:
To do most of the work, use a brick instead. It's going to eat through your stones very fast unless they're diamond Feel free to draw on the knife (if you weren't already planning to), and be sure to check your work, as you can't put metal back on.

I've done this many times on both stones and grinders. I like to work small sections at a time, then do blending strokes to make sure everything isn't jagged, and finish by deburring and easing the corners.
Click to expand...
I have 2 different grit files. Is that what you would use at the end for deburring and easing the corners? Maybe files then the side of a stone then some sandpaper?
 
I did something similar on a Henckels chefs with serrations in the middle. I spent maybe 30-40min grinding them down on 240grit. Then, a bit of time making it even. Worked knife. But, I also wasn't looking for great finish, just usable result.
 
labor of love said:
I have 2 different grit files. Is that what you would use at the end for deburring and easing the corners? Maybe files then the side of a stone then some sandpaper?
Click to expand...

To round the corners and refine, I'd move to your stones after all the heavy lifting was done. Just no point wasting expensive stones when a brick costs me 67 cents. With the tip being thin, you won't need to spend a ton of time making everything perfect. You just don't want a burr catching you, or having sharp corners.
 
The knife Im about to tweak is pretty pricey ($560ish)
I’d send it back to the maker, as he’s pretty cool, but I think he closed his shop for the time being.
 
That would definitely work.

If you're worried about messing up the knife, and you know the maker, it would be a good idea to shoot them a message. I'd like to modify my own work if someone wasn't completely happy, but it's understandable if you're in a hurry, or just looking for a project.
 
ED61EFA1-3022-43A0-A882-C6A3839BA938.jpeg
Ken Onion Work Sharp does a quick job. I take the edge guide off and rotate the belt for a mini belt sander. Like $150 new. You can also polish and round the spine with the finer belts. Lift the the tip up at mid belt to keep from clipping it off. Work perpendicular to the belt. The machine has a lock out button so you don’t have to hold the trigger and it frees up both hands. Way quicker than stones/diamond plate and you can get whatever shape you’d like. I use blue masking tape (cut to the shape I want) on the blade to protect the finish and also as a template.
 
I’m speaking with the maker right now sounds like he is still open for business, his shop just happens to be closed to the public.
If nothing else this thread was educational.
I likely won’t attempt modding it in my own now.
 
labor of love said:
I’m speaking with the maker right now sounds like he is still open for business, his shop just happens to be closed to the public.
If nothing else this thread was educational.
I likely won’t attempt modding it in my own now.
Click to expand...
I was going to say that 'this is a really simple and fast job with a belt grinder'.
 
Not a super knife, but metal file (plus a mask) and paper works. But it’s not very fun.
 

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