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 ...

[FreeRider] had built a CNC router before but it was big ... much attention to detail went into the design of this machine. Aluminum angle act as linear rails on which v-wheel bearings travel.