12-30-2017, 10:25 PM
As a maker, I try to use every 'trick' available to prevent heating the blade after heat treat. low belt or disk speed, wet belts, dipping the blade in water after each pass, using fresh belts, less force of blade to belt or disk. It took time to come up with my HT recipes that match steel and my furnaces. heat treating a high carbon steel blade takes about 3 hours plus an hour for furnace to warm up. I usually do batches of 5 to 10 blades at a time, so heat treating 10 blades will take 6 hours. all that time and care is wasted if I over heat the edge. I cringe when I see some of the U-tube videos of commercial makers finishing blades and streams of sparks fly from the edges.