In general, CNC milling machines are used to precisely cut iron designs.  Then they are hand polished to perfection. 

RC

thanks rc. ur a beast and enjoy watching ur inside the studio show episodes. keep making episodes

thanks rc. i have a few questions and im a huge titleist enthusiast. do u know of any new titleist irons that will be coming out and if so wut r they called?

frankie

Think you will have to wait until 2012...but for now...we've got some great stuff out. 

RC  I think you're thinking of Milled rather than Forged.  Forging is the forming under extreme pressure, often from a blow, while red or white hot resulting in improved grain structure and higher strength.  Often forged irons are then milled, especially details like grooves and logos.  --Jerry, aka golfnerd (Professional Engineer, Mechanical, State of California)

Forging iron heads is a process in which the metal is pressed under tredmendous pressure into a mold.  There is a lot of information on the internet about it.  The tolerance in forging is very good.   A CNC milling machine might come into play with face milling or cutting our a cavity.