Originally Posted by
ps_bond
Rather than a timer, a PID controller is fairly simple to add on - they usually use a thermocouple (K types lose their accuracy at the higher temperatures) and a solid-state relay to drive the heating coils.
Ramp & hold are important for burnout - the first stages drive off the remaining water, then subsequently the chemically bonded water in the investment. The investment makers have fairly detailed burnout instructions (although they vary depending on what you're burning out - RP resins for example).
My HT oven is on a normal formica-type bench, with the requisite space around it - but it has legs. Depending on the size of your furnace, it might be wise to sit it on asbestos-substitute mats.
I'm jealous - I bought a s/h furnace recently but it tops out at just over 1k C, which is fine for most precious metals but I was looking to melt copper in it...
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