Chris Radek <[EMAIL PROTECTED]> wrote: > On Mon, Oct 08, 2007 at 07:51:59PM -0600, Sebastian Kuzminsky wrote: > > reference voltage: 19.1 V DC > > no-load current: 0.16 A > > Peak/Stall Current: 2.51 A > > I think these are the same motors I'm using on my sherline lathe.
Mine is an 8322, yours is a 9413, I can read the label in this picture: <http://timeguy.com/cradek-files/cnc/lathe/DSCN6295.JPG> The current lineup of 9xxx motors have much more torque than the 8xxx series motor I'm using, but I think the 9x14 winding has been discontinued, I can't find the specs on it. How many lines do your encoders have? Where did you get the belts & wheels for the X & Z axes on your lathe CNC conversion? What's the transmission ratio? What kind of leadscrews are you using? > > Duty cycles from 0 to about 55% give me increasing whining from the > > motor but no movement at all. 55 to 100% gives increasing motor speed > > and torque. > > I think my linearity is much better than you describe. Maybe try > pure pwm mode (not pdm)? Or it may just be a matter of your low > power supply. I'm using 24V on mine. I really need to scrounge up a better power supply... I'll try PWM too. Can I see your HAL config? > pwm/pdm also have scale and offset parameters that might help you. I thought of using pwmgen.scale, but isn't that equivalent to just increasing the PID gains? Hm, there's also pwmgen.min-dc, which you can set and it gets added to the duty cycle. That'd probably work, but at the cost of always running at that min-dc value. It'd be pretty similar to the HAL circuit I hacked up a few nights ago, which would add an offset to dc's greater than 0.01, so that it would settle down when it reached the target. Thanks for all the suggestions! -- Sebastian Kuzminsky ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
