On Tue, 2012-07-10 at 11:17 -0500, Jon Elson wrote: > Kasey Matejcek wrote: > > I'm using a johns univ pico controller and his dc servo amps > > > > I'm trying to use one of his amps to drive the dc servo motor on my lathe > > > For open-loop speed control, see > http://pico-systems.com/codes/minimill/ > > This is my minimill configuration, so it has some stuff that eventually > needs to come out, > namely the Y axis. But, it has axis 3 PWM output driving my PWM servo > amp to > the spindle motor, and axis 3 encoder input sensing the spindle for a > speed display and > for threading. It is capable of reversing the spindle for rigid tapping. > > spindle.hal and spindle.xml are entirely for on-screen display through a > pyvcp panel.
Just in case, one of my Pico PWM amps needed to be modified to run a motor continuously. The large motor output filter inductors would overheat fairly quickly. This isn't a problem for axis motors that usually are not on for very long. Jon suggested removing the motor output capacitors. I'm not sure what happens with EMI with these capacitors removed, but it does allow the amp to work with a spindle application. Newer amps may not have this problem. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
