Don't push as hard as you can be patient it'll get hot for you. You can run the hardness out of the spots you need to drill spinning a piece of round stock or reversed old drill bit with a hand drill, it will just take longer, just lean on it a little. So a chisel can go straight vertical while you might want a knife to go in point first then follow the profile thin to thick while rotating your knife tang down the deeper you go. When you quench your tool, knife or chisel, think having the sharp end follow the path of least resistance and thin to thick. Don't go side ways(horizontal?) because one sides cools faster and will warp. if you move it up and down about a half inch, you get a band, not a line where the quench stops. this keeps bubbles off the steel and prevents a line between hard and all else.
I always "dip" my tools in vertically, and move them up and down. I want this color max up to the top of the edge bevel. For my cold chisels, I draw them to the color just in front of the blue. A light straw or even a dark straw is too hard for a cold chisel and you may get chips on the edge. Most of my hand tools are from coil spring. It looks like your tool is a chisel and the profile is what I use for a cold chisel. have a tin can with water as deep as you want to stop the color run. polish quickly and watch the colors run, like you have done. Heat to critical temp back about where the blue starts, quench the tip vertically up and down about to where the handle begins. I'm not sure I understand your second question, but I think it has to do with a differential temper, or reserve heat temper, one and the same. anneal the whole thing, drill holes, finish heat treat, and call it practice. To solve yours, wrap your blade in a rag and keep it wet. I anneal my tools, then drill holes, then heat treat.
DRILL BITS FOR HARDENED STEEL HOW TO
How to drill hardened steel and how does one control temper "moving" does it matter how you dip steel in quench.Well third one after i polish grind blade and put it in fire then quench it i have issues sometimes to see temper color becasue of scale that is blue grayish collor and it form.Īnd if i will grind it i will loose temperature. iam not still sure how it does horizontaly or verticaly, and what efect it, does it effect how you dip your blade in liquid (oil water) how will temper appearįor example this screwdriver "chisel" or this knife Well question is how to drill that i tried and drilled 90 percent of one small hole and dril bitt wont come anymore deeper.Īnd one question two how does temper travel trough blades. Knife made from leaf spring i think its is too hard to be drilled, can i skip again anealing or normalisation (i think i get good quality on blade) and doing that again heat treat might ruin it. Everything is finnihed i mean about heat treat.