Knife making 101 - Lesson 9...Correcting warping

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    Check the blade after all heat treating is done for straightness and warping. Sometimes the heat treatment deforms the metal. A good looking functional knife must be straight and true. Most problems can be corrected.

    A common problem is the knife bending at the point the blade meets the handle because of uneven heating. To fix this, clamp the blade in a vise. Use leather or wood to protect the  blade surface finish from the vise jaws. Clamp the blade so the edge of the vise is parallel to the bend, now, bend it back the other way. You can clamp vise grips onto the handle to get more leverage. A big crescent wrench adjusted to the thickness of the steel works but be careful it doesn't slip off. Bend the steel in the opposite direction further than you want it to go. It will spring back some if it's good high carbon steel.

    Sometimes the blade will bend or warp near the tip. To correct this problem, I use an anvil. Place a flat piece of leather on the anvil. Lay the blade on the leather and cover with more thick leather. Use a hammer to pound the blade flat. To Lesson 10.

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