Automated ingot production

[mrmorse]

I asked the same question on the tfc forum after the update and got this response from Dex:

"With the arc furnace, you smelt 4 normal quality ore into 1 ingot of that metal (currently this can be done for: Wrought Iron, silver, copper, gold, steel, and platinum). Rich quality ores can be run through the grinder to produce 1 normal quality ore piece and 1 poor quality ore piece per rich piece added."