On 05/01/2014 06:22 AM, andy pugh wrote: > On 30 April 2014 19:37, Curtis Dutton <curtd...@gmail.com> wrote: >> The motor is a 130W motor >> 1.5mm at around 12000mm/min. > That seems like a very small motor, and a very fast travel. > > Is it possible that the motor is simply running out of steam? > Generally when the drive runs out of available voltage the following error very suddenly grows without bound. So, you can be at 500mm/min with error of .01mm, and then at 550mm/min the error rises continuously because full voltage applied to the motor is only giving you 520mm/min, to give an example.
So, having the following error increase only a modest bit at higher speeds may indicate the drive just has a constant time lag in the internal loop. Or, it may be a torque limit, where the 130 W motor is nearly maxed out on current driving the axis at 12 m/min. Those conditions might cause a bounded error that increases roughly proportionally to velocity. Jon ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available. Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
