> From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > On Wed, Jan 5, 2022 at 3:29 AM Gregg Eshelman via Emc-users < > emc-users@lists.sourceforge.net> wrote: > > > That repeatability is plenty good enough to drop work into an automatic > > holding fixture (which does the final precision positioning) then pick the > > pieces out for transfer to another manufacturing stage or into a box. > > > > As it turns out, for all the really hard tasks, +/- a quarter-inch (0.25") > is accurate enough. You only need 0.001 inches for the simple no-brain > jobs. So my point is that you can do a LOT with the cheaper 3D printed > plastic version of this robot. > > I'm surprised there are not more people here working on robots. hey are > very much like CNC tools but more interesting. >
I'm headed in that direction once I get the power drawbar working to my satisfaction. I had considered using one of the Size24 Steppers with 50:1 planetary drives to replace the butterfly impact wrench. Easy enough to track turns with an encoder on the back of the motor and let it stall when target torque is reached with software control of motor torque. Then to remove use full torque for required number of turns. Then the tool changer. To me a robot arm seemed more useful since I'm using TTS and R8 tooling. Lining up the R8 is possible because the spindle has step/dir so the spindle could be rotated until the R8 tool slips up the key. Anyway, my Ball Bearing Jacobs Chuck with R8 weighs in at 1.7kg without tooling so I think a 3D printed version of this arm is probably just a bit undersize along with the planetary gearboxes not being 0 backlash. You're right. His software is minimal but still the entire project as open source is impressive. Few people are doing it to that level even if he's earning income off the metalwork and part sets which comes to over $1k if you buy his metal and bearing and parts sets along with the StepperOnline motors and gearboxes. But still it's interesting other than I'd much rather dedicated a Pi4 and LCNC to it. With no idea where to start since I don’t' even know what ROS2 is and am confused as to why Tormach is using the MachineKit version instead of LCNC. I thought MachineKit had stalled and was no longer used. John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
