many other shapes. The type of milling machine in the UCR Mechanical Engineering Machine Shop is a variable speed vertical spindle, knee-mill with a swiveling head (also known as a “Bridgeport”). Although there are several other types of milling machines, this document will focus only on the vertical milling machine. 242 Discussions. For a more capable spindle option, little machine shop sells the R8 milling heads from their mini mills seperately for $350 (with everything you need to start using it). ... Homemade drill press mill conversion constructed from a drill press, ER20 collet, and spindle bearings. A downfeed was constructed from a garage door.