I'm always inventing things but never building them. Decided to finally to take the step of making a light duty injection molding machine (plastics manufacture). Anyways, the molds needed for the parts you make need to be made of a solid block of metal (steel, alum, etc.) because of high pressure + 350-450 degree temperatures. Outsourcing mold making is very expensive, so I need to make them at home. I have never machined parts. I'm not looking to spend a lot of money on this. Maybe a $300-700 machine / set up. What I need is a machine that carves into the face of a solid metal block with moderate precision (+-.025" at worst) the shapes I need to. Would that be a milling machine? And keep in mind since I only need to make each mold piece once (or rarely in the case of breakage) I can spend a good amount of time on each piece. 1. Is a vertical milling machine what I am looking for? 2. For this one and done machining need, would a manual be better than a CNC machine? If CNC is better, is that even possible in my price range? 3. Where do I find aluminum blocks that are at least 4" x 10" x 20"? I looked at ebay and all I saw were blocks less than 2" thick. Thank you very much, I need to know what direction I need to look when making my machine purchase. Thank you for your time.