Here's a neat video I watched a few weeks back on YouTube showing how it's done here in the USA by a small shop.
https://youtu.be/ImPWnJ44xio
Ries I noticed you commenting about needing large batches to keep the costs inline does the induction furnace help any bit in the considerations?
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I am sure induction furnaces are cheaper than, say, coal.
But to make a frying pan that retails for 20 bucks, I cant see the difference in price that induction offers as being much.
I used to have a production piece made at a foundry in LA that used coal- and did mostly gray iron for industry. They are still there, still in business, although I wonder if they still use coal. But their batch sizes, which were more like a ton or so, would still mean MY cost for a frying pan, before cleanup, would be more than 20 bucks. You gotta be making a LOT of parts to get cast iron in the USA below 5 bucks a pound, raw. And the amount of grinding and sanding to get a raw casting to a saleable frying pan is gonna be a fair amount of labor.
I used to pay a finishing house, a place with 20 guys running sanders and buffers and flexible shafts all day, about 5 bucks apiece, in the 80s, for a casting maybe a third the size of a frying pan.
Today, my guess is that sending frying pans out to be finished would be another 20 bucks each.
Not an easy way to do it automatically, either. You could make a machine to sand the insides, I suppose, but again, amortized out, you are talking much more than Lodge charges.