Thread: Home-made furnace for hardening

Hi gents!
I decided to make a muffle furnace
I read the forums, made calculations, collected materials.
For hardening of knives and razor blades to me more than enough
Internal Dimensions: Diameter - 50 mm, length - 280 mm. The design temperature up to 1000 degrees. Celsius.
Automatic first made on thyristors, but for some reason he was burned in the tests, and I remade by a magnetic switch. It seems as long as everything works. Will soon begin full operation, except the furnace should be much more.