whats a millwright?

I am wanting to learn how to blue, brown, and case harden steel at home. I understand the basics of these processes but am looking for step by step instructions and technical info. I have found several places to purchase info from and do not have a problem doing so, but I thought I would try to find some free info if I could. I cannot find a local gunsmith that is willing to teach me, can't really blame them either. I am learning to make custom bits and spurs at home and would like to use these proceses in this hobby. I am a Millwright/Machinest by trade and work at a power plant, so I have acess to tools and chemicals used in these processes. Any info or links to websites would be appreciated.

Thank You

My dad and i have been collecting for about year and a half. In the last six months we've been having problems keeping a regular supply, first it was claim jumpers and know the rendering company is starting to pay for it instead of charging the resturants to haul it off. Were looking at building our own steel tanks and buying the oil under contract with the businesses. Are any of you other people that are collecting having this problem and if so how did you deal with it. Thanks.

I know that the feds only allow a certain amount that private citizens can produce before taxes apply and that amount varies at the state level.