How to straighten a 1095 chopper

[Brian77]

I just received a 1095 blade back from Peters Heat treat. 3/16" thick, 10 1/2" blade. total at 15 3/4". Hardness was requested at 60.

The grind is a 3/4 height grind, and the edge was left at .030. Measuring back from the tip of blade, there is a very slight bow starting at about 6". Maybe about 1/16 to 3/32 total. The spine and edge appear to have about a matching bow...

May I ask how you would approach trying to make it straight? Or would you leave alone? I have never tried to correct this on something this size. It's my first large knife.

Thanks,

 

[E.Carlson]

I clamp my warped blades with the hump of the bow facing up to a piece of cheap steel with washers underneath to act as shims. I tighten down a c clamp on the bow to reverse it and then toss it back in the tempering oven at about 25 degrees lower than the original tempering temperature. Usally 2 washers on each side will do it.

 

[Brian77]

I clamp my warped blades with the hump of the bow facing up to a piece of cheap steel with washers underneath to act as shims. I tighten down a c clamp on the bow to reverse it and then toss it back in the tempering oven at about 25 degrees lower than the original tempering temperature. Usally 2 washers on each side will do it.
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Do I understand that you put in in the oven in the clamps?

 

[E.Carlson]

Yeah, put the whole thing in there. I usally start by reversing the bow exactly, take it out after 45 minutes, check it, do it again increasing the reverse bow every time till it is straight. Sometimes it takes me 3 or 4 tries.

 

[Nathan the Machinist]

^ that's how I do it

 

[Brian77]

Thank you for the responses... I will call and find out what the temps were for tempering and then give it a go. appreciate the help.