Electric Heat Treating Oven

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unc1esteve:
At this point I could see flaws in my theory.
Most instructions about tempering say to temper
right after the quelch. How am I going to do that
while waiting for the oven to cool down to 400 deg.?
My idea of just a control defeats the purpose of the oven.
I thought that by watching it I could control the temperature.
So I concluded that I needed at least a pyrometer. And two
ovens if your are going to temper soon after the heat.

I found this pyrometer but did not order it.
http://www.clay-king.com/pyrometer.htm

I looked at PID controls.
http://www.ebay.com/itm/3-IN-1-PID-Digital-Temperature-controller-40A-SSR-Thermocouple-JT1-/400603021461?pt=LH_DefaultDomain_0&hash=item5d45cd0095
When buying a PID you will probably have to purchase a separate thermocouple of the proper range.

It should be obvious to the casual observer that I was fast
approaching my fixed income budget.

unc1esteve:
It did not take long to heat up the chisel.
I decided not to quelch it as the epoxy I used
on the handle was melting.

And how was I going to correctly temper it?

unc1esteve:

Safety
The placement of the oil next to the oven was
for illustration only.
The correct way to quelch the chisel would be to
place the oil container in front and below the oven.
This would allow one movement from the oven to the can.

unc1esteve:
The oven heated well, too well.
The outside was hot, too hot to touch.
I had viewed videos where the builder
said his oven was cool with only 2 1/2"
of insulation.

So instead of burning my shop down
I ordered more insulation. I felt it was
better to make a new sheet metal skin
than to take the chance of a fire. I ordered
ceramic board as I wanted to view the material.
http://www.skylinecomponents.com/In-Stock_CeramicFiber.html

I had thought about just starting over but the
original design was still valid with some refinements
in the budget. I decided to stay with the switch and
add a pyrometer. I liked the analog one but found this
http://www.amazon.com/AGPtek-Digital-Thermometer-Thermocouples-50~1300%C2%B0C/dp/B0084JQLRU/ref=pd_cp_hi_3
It requires a high temperature thermocouple.

unc1esteve:
I had ordered furnace cement. It arrived damaged.
They replaced it.
http://www.ebay.com/itm/Oatey-Company-1-2Gal-Furn-Stov-Cement-35515-Furnace-Cement-/281185276440?pt=US_Hand_Tools&hash=item4177f2d218

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