On Tue, 13 Dec 2011, Tom Easterday wrote:
> Date: Tue, 13 Dec 2011 11:45:41 -0500
> From: Tom Easterday <tom-...@bgp.nu>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Encoders
>
> Thanks for the info Jon. We are seeing a small (about 0.001) position error
> just on initial acceleration and deceleration that we cannot account for.
> It may be due to the encoder. Since this is mainly a plasma machine we will
> probably live with it. If we need to do better we'll look at replacing the
> encoders. We now know the string attached to our cheap encoder :-) -Tom
>
Have you tried using FF2 to tune out the lag/lead during accel/decel?
(a jerk limited profile would also help)
Peter Wallace
Mesa Electronics
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