Re: Which Software?

Is there a way of getting position information feedback with stepper systems?
Likewise how is rampdown, overrun and over current handled with say mach1 and gecko drives with either steppers or servos?

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Date: Sun, 15 Dec 2002 23:43:27 -0600
From: Jon Elson
Subject: Re: Which Software?

This is really a half-servo system, as the computer has no idea where
the machine is. generally,
all it gets back is a fault indication, but it has no idea how close to
the commanded position
it really is.

A true servo CNC system has the encoders feeding back position
information to the CPU.
This allows for constant monitoring of following error, as well as
adaptive control, where
other axes are slowed when one begins to lag.

Also, with encoders fed back to the CPU, the computer always knows the
true position, even
after a crash or emergency stop. Without this, any emergency stop or
driver fault during
motion leads to loss of position information, and you have to re-home
the axes.



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