What is open loop and close loop positioning system in CNC machine?
In a closed loop system there are sensors that constantly measure the actual position of the stepper motor or axis. The actual distance moved can then be compared to the distance requested. If the requested distance varies from the actual distance then closed loop system may simply sound an alarm and stop the machine or it may to compensate by sending additional movement commands until the actual distance moved is correct.
A closed loop system is much more expensive and requires a more sophisticated set of software so typically closed loop CNC machines are only found in high end commercial applications.
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