The linear motion system plays a vital role in any linear CNC machine, and CNC routers are no exception. Without these systems coupled with a drive system, a CNC router would be of little use.The LM system is responsible for three primary tasks.
1) Support Machine Components
2) Guide the machine in a precise linear motion with minimal friction
3) Support secondary loads (Torque, Lateral Loads, etc)
A LM system is composed of some type of linear bearing and the linear bearing guides. There are a number of types of bearings and guides, each with advantages and disadvantages. Because of the importance of this system, it is vital for a buyer a builder to be knowledgeable about the LM components. 2) Guide the machine in a precise linear motion with minimal friction
3) Support secondary loads (Torque, Lateral Loads, etc)
Source : http://www.cncroutersource.com/linear-motion.html
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