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« on: April 22, 2009, 04:01:42 PM »
One thing that no one has mentioned is that with a stepper system if everything is ok it works but if anything goes wrong it stops.
A servo system on the other hand can fail in such a way that the servo takes off at full speed and goes until it hits something that can stop it.
That is the reason for the high cost of commercial servo controls. They have to be able to detect and stop any such failures.
Systems that only rely on the driver to recognize out of position moves don't have the safety of a system that also depends on the control.
Speed is not the most important thing when most of us are at best high end hobbyists. A mill that can move at 500 -600 IPM would scare a lot of us.
It is not as if shaving 30 seconds off of a part run would save us millions like it could in a major factory.