On 2/17/2014 4:47 PM, Steve Blackmore wrote: > On Sun, 16 Feb 2014 16:51:06 -0600, you wrote: > >> On 2/16/2014 4:03 PM, Steve Blackmore wrote: >>> On Sun, 16 Feb 2014 14:11:13 -0600, you wrote: >>> >>>> With the recent release and general popularity of the ShapeOko V2 >>>> desktop mini-mill, I have several folks who are trying to use LinuxCNC >>>> running on the BeagleBone as a control. If you are unfamiliar with this >>>> machine, here's a link: >>>> >>>> https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2 >>> >>> Cant help with the best way to run that with LinuxCNC, but I'd be >>> tempted to remove one stepper and run a cross shaft driving both belts >>> with possibly a bigger stepper motor. >> >> Sorry, but I don't consider changing the machine to fit the tool to be >> an acceptable solution. > > Then your stuck with a known problematic design. I wish I had a pound > for each complaint/query/moan I've seen and heard about twin steppers on > a gantry machine. > > Other fixes include servos or closed loop steppers but keeping both > sides in synch with software without any feedback is nigh on impossible.
Steppers are not the problem, the issues I mentioned apply equally to machines with servos and encoder feedback. I'm asking for the suggested best way to configure LinuxCNC for controlling a gantry system, that presents the user with the least opportunity to "shoot themselves in the foot". For instance, how do you avoid racking the gantry when jogging in joint mode? Do you have a servo gantry config that avoids or minimizes this possibility you could point me to? I know folks are controlling gantry systems with LinuxCNC, I'm wanting to know how, and what are the pros and cons of each setup. -- Charles Steinkuehler char...@steinkuehler.net
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