sword heat treat oven build

I made a Part list of things i need to buy.
Please scream out if something is missing.

There are two things I'm not sure about:
what kind if fuse should i use in the pid box (main power 240v)
and what kind of fuse on the pid controller?

And I have seen people taken a 12 volt transformer then connected it to the pid controller.
doesn't the controller have a 12v output? Or is it recomended to add a 12v source to the PID controller, if you are going to add a lot of lamps and fans?



Here are the part list:

60+ JM23 bricks
2 KineticaCNC 1.6mm 1500 Watts apiece 115V in series.
1 CN7800 pid controller
1 Type N Super omegaclad xl thermocouple probe with mini transition
1 miniature panel jack
2 Fotek SSR 40A
2 Aluminum Heat ink for 10A-40A SSR
1 DPST rocker switch
2 led lamps
1 Toggle switch
1 limit switch

I'm sure I have forgotten something..
 
timgunn1962 said:
7" Wide, 6" High internally.

I think I used 27 bricks for each oven, plus the board for the door and the back. The bricks are 9" x 4 1/2" x 3" JM23 IFBs made by Morgan Thermal Ceramics. They are easier to find in the UK than K23s.

The door and back are a single layer of 2" Ceramic Fiber board.
Click to expand...

I've always wondered how knifemakers HT sword, now I know :thumbup: I would ask why instead of bricks are not used Ceramic Fiber board for build whole HT oven ??
 
The parts list looks ok (though I've had the winter lurgy and still seem to have a head full of broken biscuits. I could be missing something).

I use a type B MCB and an RCD (GFCI?) on the incoming 230V supply. I don't fuse the supply to the controller separately.

The wiring diagram I have used since my second oven is broadly as this.

 
With that diagram you will have 230v through the door switch, right?

And what is the ssr that just goes in and out through the pid?
 
Yes, it's 230V through the door switch. However, the 230V live is only present at the door switch when contactor C1 is in or the momentary start button is being pressed.

The output from the controller to the SSR is a DC signal, sourced within the PID controller, onto the input side of the SSR.
 
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