Another feature that you need to check on the CNC machine is the drive system. There are three basic drive systems for CNC machines: rack, pinion, leads screw, and balls screw.
The rack and pinion drive system works well when you are working on projects longer than 4 feet. Whilst the leads screw is more accurate than the rack and pinion, it is better suited on shorter projects. The ball screw drive system, which is the most expensive of the three, presents you with more accuracy and precision on more significant projects.