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 Invariably, one of the first questions I get is how to setup a configuration to deal with the gantry setup of the ShapeOko. I know of at least three different ways to control a gantry system with LinuxCNC, each with it's own pros and cons: 1) Use gantrykins, and hope users are intelligent enough not to rack the gantry when moving around in joint mode. 2) Use trivkins and setup HAL to turn one axis into two by craftily combining the commanded motion with the homing switch states. This is easiest if HAL is doing software stepgen (just mask the step pulses in the base thread), but I'm pretty confident I can make this work pushing the logic in front of the PRU drive step/dir component (as a bonus, this setup would also work with Mesa hm2 cards and other hardware based controllers). 3) Ignore the gantry complexity, and just drive both servo motors from the same stepper driver. This works _OK_ for the Z axis on a 3D printer, but probably isn't a good idea for something that is actually making chips. Questions: Did I miss any significant options for controlling a gantry style machine? Which option would be recommended for novice users new to the LinuxCNC and CNC world? I'm thinking the "Magic HAL Wye / Y Cable" that splits one joint into two is probably the simplest for most folks to deal with, but am open to suggestions. -- Charles Steinkuehler char...@steinkuehler.net
signature.asc
Description: OpenPGP digital signature
------------------------------------------------------------------------------ Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk
_______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
