Straightening blades

I made a hard hammer out of tool steel after seeing this video years ago. I broke a few blades and never got the consistency I was looking for.
 
KNelson said:
I learned this the hard way! totally works though..
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I tried it the first time with a smirk on my face because I knew it wasn’t gonna work. Then it did and I was blown away that straightening a kitchen knife could be that easy. People generally ignore my comments, as I did at first, thinking it was just talk. I get that most folks don’t have a bead blaster but in my neck of the woods almost anybody can find access to one.
 
I have been plaqued off and on with my blanks from a local heat treater, while his thick obtuse geometry knives are just fine after plate quench, I occasionally experience warpage. I really feel the warpage is because at times I get impatient and force grinding the faces with PM steels pre heat treat.

I just picked up 2 Z-tuff blanks with unacceptable warpage. I do not think clamping during temper would work as i do use a 1000 degree Fahrenheit temper but I have had decent results with clamping with shims and heeting to around 400 degrees, this technique only got me so far.

Long story short, i could only remove so much warpage with clamping and heat so decided to try the hammering inside of the banana technique. I took a 12 oz cheapy hammer and drilled a 1/4 inch hole to install a broken carbide drill bit secured with Gorilla super glue. Very ugly tool, but I was able to straighten my blanks with hammering inside the banana.

Thanks for all those that contributed to such useful knowledge sharing.
 
Murray Carter has a new YT video out on straightening including discussion on the tagane hammer for straightening homogenous steel blades
 
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