On Wed, 2008-04-09 at 08:50 -0700, Andrew Ayre wrote: > [EMAIL PROTECTED] wrote: > > > > --- [EMAIL PROTECTED] wrote: > > > > From: Andrew Ayre <[EMAIL PROTECTED]> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > > Subject: Re: [Emc-users] Newbie Help Needed - Losing Steps > > Date: Tue, 08 Apr 2008 18:08:58 -0700 > > > > Update - I switched to 1/4 stepping mode. Movement is smoother and > > quieter. The top speed of each axis is now limited by the speed of the > > real time system on my PC, with no stalls. > > > > Thanks for the help. :) > > > > Andy > > > > A while back I posted a pic of full step torque that was made for a project > > in India. It showed full step torque drop to near zero at resonant > > frequencies. Glad to hear that the microstepping took care of the problem > > for you. > > > > You can probably tune the loops in EMC and HAL to boost high speed > > performance if you need more than you've got. > > > > Rayh > > Ray, learning how to tune loops sounds intriguing and perhaps > interesting to play with, but it's probably well beyond my abilities. Is > there a tutorial somewhere? > > The speeds I now get for X and Y is 71.4 IPM, which I think is fine for > my small machine (18" x 12"). I'm using a P4 1.6GHz, 512Mb RAM with > Ubuntu Gutsy if anyone is interested. > > Andy >
There is good stuff here. http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TweakingSoftwareStepGeneration I tend to do what that page recommends one not do. I play some with the base period after I've done the math. Just gradually reducing the period and increasing the max velocity till it breaks. Then back off a bit. Rayh ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
