When it comes to CNC machines, your SureFine has screws on its axes, and the Bodgeport does too. A shopbot has an amazing rack gear system, but when you start to dig into the small CNC routers ...
The main material used in the build is seven sheets of 3/4″ plywood. These sheets were cut out on a ShopBot CNC router, and held together with screws in a tab-and-slot construction scheme.