[Bdi4emc-help] stepper motor emc

Matt Timmermans mt0000 at sympatico.ca
Thu May 4 16:59:14 CEST 2006

Hi Andy,

If you already have a BDI-based config, you just need to change the EMCMOT 
parameter in the [EMCMOT] section of your ini file from "freqmod" to 

If your PERIOD was set too high because of CPU limitations, you can probably 
set it lower.   0.000015 should be fine unless your system is very special.

If your DEFAULT_ACCELERATION and MAX_ACCELERATION are set unrealistically 
high to reduce path errors at corners, go ahead and set them to something 
your steppers can really handle, since the new BDI has path error limits.

If you were avoiding backlash compensation because you were losing steps, go 
ahead and put it back in, since quickstep enforces acceleration limits while 

Hope that helps,


>From: Andy Holcomb <andyholcomb at comcast.net>
>Reply-To: "Help and advice for BDI-4 
>users."<bdi4emc-help at lists.ourproject.org>
>To: bdi4emc-help at lists.ourproject.org
>Subject: [Bdi4emc-help] stepper motor emc
>Date: Wed, 03 May 2006 23:23:22 -0500
>From what I understand there is a new mode for emc to run stepper motors 
>better, I have downloaded and installed bdi 4.44 and installed it. How do I 
>install/run this new mode?

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