D.Douglas
Well-Known Member
I have this neycraft kiln that i use mainly for casting jewelry pcs. The other day i had 4 blades profiled and ready to heat treat. Couple of band saw blades and some 1095. First heat up to 1450 and quench into parks 50. Clean them up check for hardness. File bites and i can bend the thin band saw blades and the do not flex back. Put them in again since the kiln is hot bring up to 1500 and quench. Same thing! Flustered i called Bubba-san and we came to the conclusion that it must not be getting hot enough. Try a magnet he says. Good idea!Crank it up to 1500 pull it out magnet sticks. Go to 1550 same thing. 1600 bingo! No stick. Quench and hardness. I was unable to grasp at first that the pyrometer could be wrong and that just a few degrees would make that much difference.Something as simple as a magnet confirmed that it was off. A great learning experience.
Doug
Doug