I have been meaning to design and build myself a dedicated heat treatment oven for small items for ages and recently kicked the project off by ordering a PID controller and cabinet and a couple of other electrical parts. Today I ordered the insulating fire bricks and mortar which will be used for the construction. The physical capacity of the oven is small at 154 x154x228mm or 6″x6″x9″ however that is more than enough for a handful of strikers (Firing pins) or replacement hammers or for hardening dies and similar.
The image shows the HT Oven concept with the open door, I have omitted the liner plates and frame as this image was the original I used to determine the physical size of the internal space and the layout of the insulating bricks.
The box on the right hand side houses the controls and I have also omitted the screw catch that holds the door closed and the hinge system.
Frame construction will probably be 25,0mm angle iron and the infill will be either stainless of aluminium sheet depending on what I can source locally.
Maximum operating temperature is a theoretical 1050 Celsius which is 1922 Fahrenheit, or more than I will ever need for most applications.
The addition of the HT Oven is something we have recognised a need for as it means I can more accurately control the temperatures for both hardening and annealing of materials in house instead of resorting to a gas torch with the lights out, or shipping things off and waiting days for them to be returned.
The bar at the top is to enable it to be picked up and moved and will probably be shifted towards the right to bring the balance to a central point.
I will use stainless foil sheet to wrap items prior to heat treatment to minimise scaling as it works surprisingly well if you flatten the envelope you have formed to hold the part to be treated. I guess some pictures at some point would better explain this.
More to follow on this project.