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Cross posted with Ember Knives info on the Jay Fisher system, which neatly illustrates my point.:) Effectiveness of adding fins or holes to a quench plate is likely more a matter of timing than anything else. Quenching happens relatively fast and primarily makes use of the conductive path of...

That's exactly how I had been thinking about making one. Thanks for validating my concept. I just spent 5 minutes in the basement ressurecting my 50 yr old train transformer. Now to see if it works and if I can find a DPDT toggle switch.

Agreed that the VFD is a significant upgrade. Just be aware that you can trash the 2" aluminum wheels on your platten by grinding directly on them the way you could on your older rubber covered contact wheels.

Shame they don't offer a mercury relay option. Extremely robust from an electrical standpoint. I picked up some used 3 phase ones from a liquidator that I used on on an annealer and hot pickup oven I built for over 10 years, 5 days a week, and they are still going strong with an old West 1/4...

Next time let the oven get up to temperature and stabilize before putting the knife blank in. There is no benefit in letting the knife sit in the austenizing range for any longer than it needs to for the manufacturer's soak requirements. To the best of my knowledge 1080 does not require an...

If that is the size you need then I suggest you keep your eyes open for a used enameling kiln. With the addition of a thermocouple, PID controller and contactor (and microswitch for the door) it is pretty easy to repurpose one as a heat treat oven.

You don't have isolation valves on either side of the hydronic pump assembly? That is a standard detail for every HVAC pumping system I've ever designed. Saves big on draining down the system for standard maintenance.

I built one of my gas forges out of a similar Harbor Freight air cylinder (11 gallon size I think). Cut about 6" of length out and it still is kind of large. Looks like you are using full thickness fire brick in your forge, which is a lot of thermal mass and will heat slowly. Consider...

Naturally aspirated (NA) burners are very subject to malfunction, or poor function due to extremely small variations in their assembly and geometry. The alignment, position and size of the gas orifice is arguably the most critical aspect of the burner design. The best burner designs, IMHO...