[Bdi4emc-help] max pulse rate

Paul bdi4emc at bulldoghome.com
Sun Jan 6 01:30:34 CET 2008

Hi David

On Saturday 05 January 2008 20:57, David Szakovits wrote:
> i am configuring a system with emc2/ubuntu.   when axis comes up it
> complains that the max pulse rate is 10111 hz.   when i reduce max
> velocity to stay within this constraints my turntable is rotating fairly
> slowly.

A 10KHz max is pretty poor - I suspect even Mach3 would do better than that.

> my mill is using bd1-4.51 and quickstep and appears to be 
> capable of quite a bit higher pulse rate.  does anyone know if this is
> true or should i look for some errors on my part in the configuration
> files for emc2.

On a 433MHz celeron I use for testing, 30KHz is quite easily achieved, 
however, last time I attempted to run emc2, 15-20KHz was about the best I 
could get. Others have also commented on the poor performance of emc2, so you 
are unlikely to have any serious errors in the configuration.

> is it straightforward to run emc on a emc2 machine?

(assuming you mean that emc2 Live CD) You would need to compile from source, 
for which you will need kernel & RTAI headers for the installed kernel, gcc, 
g++, tk8.4-dev, and perhaps a couple of other development tools/libraries. 
Chances are, none of them are included on the CD, so you will have to 
download the packages from somewhere.

Regards, Paul.

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