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Marine Engineer
Doug
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4,960 Posts
Aakash,

A relay switch is a switch that operates when the incoming signal changes. Usually these are used to have a low control voltage operate something. In a CNC application, this would be what is used to turn on the spindle or the dust collection.

The stepper motor drive board is the device that takes the output from the control program and converts it to the right pulses needed to drive the motor one direction or the other.
 
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