On Monday 28 September 2009, Sven Wesley wrote: >2009/9/28 Gene Heskett <[email protected]> > >> My instant reaction is that they are very inefficient. I would call that >> size >> about a nema 17, which would be about right for a plotter, but without >> lots of geardown, would be a bit small for a milling machine even as >> small as my HF micromill. ... ... > >I just ran the Rutex tuning software and the same error occurs, I also > found out it happens on X and Y as well but not as noticable. After > reading your reply Gene, I checked what others have for servo sizes and I > believe I was not only a little bit fooled when I bought these as the > seller said they were good enough for the application. Well, I thought > they were compact... > >:( > >What is strange though is that tuning software seems to call back exactly >the amount of steps it should go and the starting position moves anyway. >When I ran my test gcode the last time with EMC2 I limited the speed to 200 >mm/min and it still gave the error. > >Is it possible that this really annoying problem be too small motors?
Only a substitution test will answer that. I think I would magic marker the motor shaft, and try it at 100mm, then 50mm, and see if it is bad, or much reduced at the slower speeds. I would also consider reducing the MAX_ACCEL settings, I found I could go faster in the middle of a move if I slowed the accels. The end result on a complex job was about the same, but the curve following on my video cards display was much better. Setting the feed override slider to 5% might be enlightening too. Steppers per sei lose torque as the speeds go up and the only way to stop that is to raise the voltage so that the winding inductance is overcome faster. The motors generally won't care since the current is regulated and its not uncommon to see a 2.2 volt motor getting 190 volts for a few microseconds if the drivers have that much available. Much bigger machinery of course than I have. Those drivers cost REAL money too, where I define real money as over $200/axis. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> When the only tool you have is a hammer, every problem starts to look like a nail. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
