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Induction forges


Well-Known Member
I am interested in one of these induction heaters. I make drill bushings by the hundred. Heat treating has always been an issue. I used to make them from 0-1 tool steel but now use A-2. My question is how would I know if they are heated to the right temperature? My mini furnace has a temperature gauge on it so it's easy now. The drill bushings vary in mass a lot so just using a timer probably would not work.

Chris Cramer

Super User
Premium Member
My question is how would I know if they are heated to the right temperature?
I don't think temperature is controlled with an induction forge. They are most often used for melting metal in a crucible that sits in the coil. Frequency can change the induction which would change the temperature, but I don't think it would be very accurate.
I use the heater mostly for efficient wrought iron work, and I might try melting silver and brass.


Technologist at Large
Premium Member
I would not worry about the water cooling stuff. Why not use a fish tank pump and filter setup to circulate the water? Toss the filter, not needed.
Heat rejection is not a big deal, it is the heat picked up from the iron bar that can melt the copper tube. I have seen stationary engines run for hours with hoses attached to a 45 gallon drum of water, and the water was not hot, just warm.
I wound up with a small chiller unit. Except it doesn't provide enough pressure. Close - if I choke the return the Hester's alarm stops and I can proceed for a while.
I have a bigger unit on its way.