Wooooo CoreXY Concept build is moving! Theres some flex in the back bearing mounts I can fix pretty easily and I need to redesign a couple things on the blue carriage. The belt clamps on the x carriage are a joke but work for this mockup. But other then that I love this setup.
Im using Igus Polymer bushings and 3/8" drill rod from fastenal. Its being driven with motors from Massdrop and an AzteegX3 board.
The original concept used spectra and seemed like it would work well but I had a lot of issues winding the spools. If anyone has any tips I’d gladly take them.
Those belts look like they’re rubbing on the ends of the X axis, also as it slides back and forth on the Y I think you might have slight inconsistencies in the tension since the belts aren’t parallel, some geometry applies but you have two right-angle triangles being formed with how they are angling… or maybe they average out… I’m actually not even 100% sure on that last part but it wouldn’t be too hard to figure out.
Oh yea they are rubbing. This was a simple scratch build to see if I could get the concept to even work. I didn’t pay much attention to belt lines. I also planned for spectra so rubbing wasn’t an issue. If I stick with gt2, I’ll work it out. But right now there isn’t really an issue.
Im maxed out on speed multiplier in repetier now at 300% so my rapids are 250mm/sec and print moves are 150. Time to slice some new code…
Nice speed. I think my next printer will be a cube shaped one.
My first mochup i had the belts wacko also. After that then it is easier to see what needs to be done.
Nice, i am still in the design stage for my corexy printer. What firmware did you use?
Hi Joe, try to keep the belts parallel or the resolution will change along the axis
Looks great. The corner idler guide and stepper mounts look familiar. I had some concept parts almost identical out at MRRF. Did I help inspire… Or do great minds think alike?
Big congrats Joe, I love that Frankenstein “It’s alive!!!” feeling. I’ll donate. Want the drill rod to last forever, have it heat treated. Trick I use to avoid the expensive rods and bearings. Try yourself or a good machine shop can do it and hand them back to you straight as a arrow and hard as a rock.
Eric you totally did inspire. You brought some parts over when o discussed going nuts on the design with you. im pretty happy with the motor mounts but I think I’m going to change the bearing side. They were both very dependent on print orientation. The first set I printed the clamps came apart immediately because of the grain going across the stress point.
@Imko_Beckhoven_van I’m using marlin. Super easy to setup just uncomment a line and off you go.
@Ivan_Fernandez where at are you talking about. In the cross point?
@Brandon_Satterfield you make a good point and I work in an experimental machine shop…
@Joe_Spanier yeah. I was worried about the grain causing delamination. Because those belts gotta be TIGHT.
Let me know if you figure out how calibration X vs Y steps. Since a movement in X is really a double step of motor A and motor B I have never really figured it out. I still get dimension issues on circles if the belts aren’t tight as a guitar string and tension between belts PERFECTLY balanced.
I printed a couple with the clamp on the bed and those came out the best but needed tons of support. The two in the back I printed so that the rounded part of the clamp was pointing up so the grain was perpendicular to the stresses and they worked well.
The next test is to put a pen in the carriage and see whats happening.
