Particulalry stubborn bend

W

Wohmsc123

Joined
Jun 17, 2024
Messages
5
Hi all, I'm working on a chef knife, post heat treat I got a pretty large warp.
I've tried to do shim tempers and other methods of straightening, but this particular bend is being quite stubborn.

Has anyone got any suggestions as to how I can fix this, I feel like I've tried everything I can find.

Thanks
Will
 
Look at getting a carbide straightening hammer.

You can also heat the spine with a torch to straighten.

Hoss
 
DevinT said:
Look at getting a carbide straightening hammer.

You can also heat the spine with a torch to straighten.

Hoss
Click to expand...
I had a look for the hammers, they are quite pricey, can I embed a carbide ball into a mallet and use that?
 
I think that will work. I took a hammer and bought a carbide ball from Amazon. Just grind small flat on the head of the hammer, punch you a center hole, and drill you a hole about the same diameter as the ball, but about half it's diameter in depth. Epoxy carbide ball and you're good to go. I don't see why it wouldn't work on a mallet, but I just wonder if the rubber in the mallet would eventually let go of that epoxy bond. Try it and let us know!
 
Stuart Davenport Knives said:
I think that will work. I took a hammer and bought a carbide ball from Amazon. Just grind small flat on the head of the hammer, punch you a center hole, and drill you a hole about the same diameter as the ball, but about half it's diameter in depth. Epoxy carbide ball and you're good to go. I don't see why it wouldn't work on a mallet, but I just wonder if the rubber in the mallet would eventually let go of that epoxy bond. Try it and let us know!
Click to expand...
I was thinking a wooden mallet, it's all I've really got, and I don't have a grinder annoyingly so I can't do it to one of my steel hammers, I'm hoping as long as it holds the ball I don't need the steel to back it up?
 
Wohmsc123 said:
Hi all, I'm working on a chef knife, post heat treat I got a pretty large warp.
I've tried to do shim tempers and other methods of straightening, but this particular bend is being quite stubborn.

Has anyone got any suggestions as to how I can fix this, I feel like I've tried everything I can find.

Thanks
Will
Click to expand...
you never said what type of steel???
 
Ken H> said:
Here's the hammer $3 I used to make a carbide peening hammer. I think I like the idea of a steel hammer more than a wooden mallet
Click to expand...
I used something similar and then used a full carbide drill bit to drill the hole for the carbide ball which was handy because I didn't have to soften the steel first. That being said, it occurred to me since then that it would have been even easier to buy a small brass machinist hammer instead so you wouldn't have to do anything fancy to drill the hole for the carbide insert. That way you've got the greater mass behind it like a steel hammer, but it's still easy to drill like the wooden mallet OP mentioned.
 
You can also build a wooden blade straightener that does work but its takes a bit of play and some fortitude :-D when using it. Its like using the shim method without heat and allows you to really focus on small parts.

Edit: Just saw a post Stacy did on straightening a bend in 1095, he talks about this and has much more info about it, follow that.
 
Last edited:
tattooedfreak said:
You can also build a wooden blade straightener that does work but its takes a bit of play and some fortitude :-D when using it. Its like using the shim method without heat and allows you to really focus on small parts.

Edit: Just saw a post Stacy did on straightening a bend in 1095, he talks about this and has much more info about it, follow that.
Click to expand...
I think I know what you are talking about, I saw a guy on YouTube using a block of wood with some slots in it.
I will give it a go, although it does look pretty scary.
 

Flattening Stock

I have some 24" x 1.5" x 0.25" sticks of 5160 that came to me with a slight bow in them along their length. I cut a 9" section off for a full tang pattern, laid it out and roughed out the profile. The bow in the stock is still significant. What's the best/fastest/easiest way to eliminate this...
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