John, If you are using a stepper at any significant revs, will there not be a problem as the torque drops off as the rpm increase (unlike a servo)?
Marcus On 12 Aug 2015, at 08:28, John Dammeyer wrote: >>> >>> LinuxCNC can create any mixture of step pulses, PWM, and other ways of >>> controlling motors. The motor interface is modular and you can set it > up >>> to do just about anything. >>> >>> >>> jmkasun...@fastmail.fm >>> >> >> Linuxcnc doesn't actually support the beaglebone. >> It was supported for a while on a branch that was not and will not be >> merged. >> It may be that you are using that old branch of linuxcnc or you may in > fact >> be using machinekit (a fork of linuxcnc) that does support the beaglebone. >> >> That said if the beaglebone driver supports velocity step mode then it >> would be >> easy to add a stepper as a spindle drive. >> >> Let us know what fork of linuxcnc you are using and we can direct you to > the >> best info. >> >> Chris M > > Machinekit is the port I was looking at. > http://blog.machinekit.io/p/machinekit_16.html > https://groups.google.com/forum/#!forum/machinekit > > Further research appears to show that the Probotix Beagle Cape doesn't > support any sort of index pulse so it's pretty well out for a lathe. Their > schematic shows three PWM pins from the Beagle but they don't go anywhere. > As in not routed to a connector. PMDX also makes a cape for $129. > >> From PMDX: > "The lack of support for hardware acceleration for OpenGL on the > BeagleBoneBlack continues to be a significant deterrent to using the BBB as > the console device running a GUI for a CNC controller. Toolpath display > using the on-board graphics of the BBB is barely usable, so plan on remote > access with the GUI running on another computer if you need toolpath > graphics." > > I had hopes for LinuxCNC running on the Beagle and being supported for the > next decade or longer. I guess not. > > Thanks > John > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
