Re: I-LPT & step/dir servo amps

Carlos Guillermo wrote:

> What would it take to match the performance of a "standard" servo system,
> using step/direction output? I've looked into this a little, and it seems
> one issue is closing the loop with an equivalent, high-performance PID
> algorithm. Another issue is resolution - you would need a fairly high
> frequency step/direction source, I suppose. Would that frequency need to be
> any faster than a good servo loop update rate (for an equivalent machine
> resolution)?

It certainly could. Assuming a .000025" encoder resolution (I have that on
my Z axis) and a top speed of 120 IPM, that is 80000 (full) steps/sec for
that one axis alone.

Jon