Having 1 oven (Bayco), 3 spray cabinets, 2 ultra-sonics, and a pair of "steel-shots", we find we very rarely "light" the oven anymore. With natural gas prices where they are and feeding the oven through a 3.000" main, it's too costly. Also, I've never really took a liking to the ovens, they tend to "bake" too much of the "core-oil" out of the castings. If the tanks are maintained properly they do just fine. I will add however, we don't handle too many used parts anymore either. 20/25 years back, before new castings "flooded" the market we managed to "bake" some 30/40 heads a week, many came from the local "junkyards" here. Thanks, Gary in N.Y.
P.S. We had one "major" issue years ago with a bad "thermo-couple" in the oven and it proceeded to melt an alloy head down into the "trolley" and the wheels. It took a while to clean up the damage. We came in on a Monday mornig and found molten aluminum coming from under the oven door. The shop was up around 100 degrees. All the safetys failed.
P.S. We had one "major" issue years ago with a bad "thermo-couple" in the oven and it proceeded to melt an alloy head down into the "trolley" and the wheels. It took a while to clean up the damage. We came in on a Monday mornig and found molten aluminum coming from under the oven door. The shop was up around 100 degrees. All the safetys failed.