@j.r_Ewing I just wanted a couple of quick and dirty parametric arc moves to plot out circles in excel so that it could easily be modified for bed sizes.
Here are a couple of videos of the printer reassembled with the speeds and acceleration turned down. First is the Break-In Circle gcode, second is the Linear/Diamonds. Just one cycle of movements each as derived from the spreadsheets I posted.
Curiously, the circles with arc moves is NOT smooth at all. I was expecting a much smoother motion. Now I need to figure out what is behind the stutter.
https://youtu.be/ltaYS52vLts and https://youtu.be/5RWIYjejMjI
@Dennis_P the issue as far as I understand it is even with a gcode arc moves, the controller just takes that code and breaks it up into a bunch of line segments anyway. The only difference is now the controller is responsible for that math.
Only controller at the hobby level that I know that actually does arcs correctly is TinyG and G2.
I turned down the speeds and ran the single cylce gcodes again. The linear moves are much nicer, but the chatter/stickshion is still there. The circles on the other hand were also interesting in terms of where on the arc the issue shows up.
Would anyone be willing to try running these scripts and reply with your observations? Each of these is the gcode generated by the spreadsheet I posted earlier.They are just one cycle each for a bed size of X290, Y280, with a 20mm margin around the perimeter, F7500.0.
https://drive.google.com/file/d/1f0ZXMR7l6OZvPvrKEvQGW0szjK1l2mCX/view?usp=sharing
https://drive.google.com/file/d/1KPXCQXVFCcJWrHgOXRG-knSHOrAHS0MG/view?usp=sharing
My next thing to try is to tune the voltage on the TMC2100’s and see what if any effect that has. I may swap them out to a set of DRV’s I have too to see if there is any difference.
Thanks in advance and thanks again for everyone’s support on getting my rig going.
I don’t know if it has been tried before, but slightly (and I repeat, slightly) heat up the plastic around the bearing/bushing with a torch and run the break-in routine should do a nice job at self-aligning the carriage, don’t you think?
@Michael_Memeteau i thought about a sandpaper wrapped mandrel or really sharp reamer to true the holes. i used the rods as a guide to press the bushings into the bores and they went in pretty smoothly.