Yea, Lars' is like mine. I'm wondering if my error is from not homing the axis, though that might be hard given the wonky Y. Lars posted his config.g back on page 3, here's mine: ; CoreXYU config file for dc42 RADDS firmware M550 PHlidskjalf ; Set machine name G21 ; Work in millimetres G90 ; Send absolute coordinates... M83 ; ...but relaby prot0typ1cal - CoreXY Machines
The fact X and U move correctly eliminates the possibility of steppers either wired wrong or running in reverse. What is needed is a way to monitor output to the motors from the Due or RADDS, or both independently. The resulting move in Y is being hijacked somewhere, the debug says the axis are in the correct position. Obviously from the video they are not.by prot0typ1cal - CoreXY Machines
Just after midnight here :p From my config.g : ; Add R1 for RAPS128 driver chips M569 P0 S1 R1 ; Drive 0 goes forwards X M569 P1 S1 R1 ; Drive 1 goes forwards Y M569 P2 S1 R1 ; Drive 2 goes forwards Z M569 P3 S1 R1 ; Drive 3 goes forwards E1 aka U M569 P4 S1 R1 ; Drive 4 goes forwards E2 aka V M569 P5 S1 R1 ; Drive 5 goes forwards E3 aka Z2 Yea, I understand the kinematics. If any steppers werby prot0typ1cal - CoreXY Machines
I'm new to debug mode, so only have Move and DDA active. Sending commands via Pronterface gives the same results as using the buttons on PanelDue, except no fat fingering G code. Though it would be nice if the rows had more space between Axis on the PanelDue. Anyways, pretty sure debug is only giving generated steps (X,Y,U and V are 160 steps per mm). Attached is the log, moves are in 100mm incrby prot0typ1cal - CoreXY Machines
Thanks According to debug DDA, # steps are correct, unfortunately movement is wrong. So here's a video... Moved U minus and plus 100mm Moved X minus 100, then -100 again, followed by plus 100 and another plus100. Here's where it gets interesting, command move Y100, actual move is Y minus 100 and X minus 200!, and U stays put (as it should) Command Y-100, and the opposite occurs. Test1 CoreXYUby prot0typ1cal - CoreXY Machines
Installed Pronterface, as don't have anything anyways. This is my 1st RepRap :p Watching Windows7 device Manager: Plugging the USB into the Due's Native port "Duet" pops up in the "other devices" with the warning "device driver not installed". No COM. Plug into Due's Programming port (BOSSA) yields COM6. Into PanelDue, nothing. BOSSA port it is. Launch Pronterface, COM6, (any baud works, 57600by prot0typ1cal - CoreXY Machines
Quotelars.arvidson If you connect usb and enable debugging you should be able to get what start and end pos (steps) the firmware is trying set for a move. Hmm, where do I find this "debugging", is there another piece of software I need to install? Thanksby prot0typ1cal - CoreXY Machines
Yea, beta11. Nothing is slipping, or the X and U moves wouldn't be precise. Each uses two steppers to move in a coreXY way. Yea, Y command moves X and Y in 45 only in the opposite direction, however U stays perp. Baffled. Thanks. Showed the owner pics of Hlidskjalf off my phone. That was my ace, interview changed from "hmm" to "when can you start?"by prot0typ1cal - CoreXY Machines
Wish it was that simple... Ran into an issue that I can't seem to get around. Moving the axis is behaving strange: Using PanelDue to move X, Z, and U work great, just as expected. Y is wrong. Moving in Y the X carriage also moves in X, while the U carriage remains fixed in the U position (as it should). Y minus input results in Y positive, X positive. Y plus input results in Y negative, X negby prot0typ1cal - CoreXY Machines
Problem with the etch-a-sketch is it uses closed loops, both of different lengths on the same axis, so stretch/acceleration/harmonics will be different on both loops. Inherently, the etch-a-sketch isn't square or parallel, not really required for a child's toy, close is good enough. Will require some degree of tuning for a 3d printer, with pulleys free to offset perpendicular to the axis to dialby prot0typ1cal - Extruded Aluminum Frames
Quotebenson Quoteprot0typ1calFail to see how this twist occurs, as there isn't any force acting on the carriage, other than linear loads from the crossing rods. Inertia. Consider when the extruder is at, say, X+ limit of travel, and you're accelerating in the Y+ direction. The whole mess wants to rotate clockwise. How much a problem this is depends on how crazy you get with accelerations... Thisby prot0typ1cal - Extruded Aluminum Frames
Hmm... bad. You just unconstrained the X, basically making both axis free floating. Rotating the steppers can effect either axis. The imaginary twist about the carriage is just as much true for a standard coreXY as the EdgeXY. The advantage the EdgeXY is that to twist the carriage you torque on 4 rods and 4 blocks, not just 2 and 2. Simple physics. And if you're using linear guide rails on the fby prot0typ1cal - Extruded Aluminum Frames
Interestingly enough, the above pic of my sketch is from July 2016, as are the Solidworks files. Calling it "CorelessXY" for lack of a better name. At that time had done the finite element analysis for deflection (modulus of elasticity) for various configurations. Frame, pulleys and belts were not considered relevant, as those variables are present in any build. Looking for a valid structure,by prot0typ1cal - CoreXY Machines
I have to disagree and agree with benson's analysis of the edgeXY. 1. Belts don't "push", they pull. Plus if tensioned properly do not produce "slack". 2. As in any CoreXY system, forces are balanced per individual axis, preventing misalignment between opposing blocks, plus the tie rods will also keep opposing blocks square. 3. The 2x belt ratio on the yellow, and 1x on the green blocks is a mby prot0typ1cal - Extruded Aluminum Frames
Quotelkcl Quoteprot0typ1cal How about G10/FR4 garolite? Available in blue niiice - you mean PCB fiberglass! that's actually a really interesting idea. it's easy to get hold of and strong as hell. That's the stuff. I get mine from McMaster-Carr. A tad more expensive than straight from the maker: I like you re-named EtchXY to EdgeXY, makes more sense. The only issue it doesn't address is thby prot0typ1cal - Extruded Aluminum Frames
How about G10/FR4 garolite? Available in blueby prot0typ1cal - Extruded Aluminum Frames
That's freakin' cool bro!by prot0typ1cal - Mechanics
Quotelars.arvidson I was thinking of using polycarbonate, should have better fire resistance than acrylic..? True, polycarbonate extinguishes itself. And there's also flame retardant grade (9034?). Acrylic is cheaper, and therefore you can go thicker for the same price point.by prot0typ1cal - General
Look at Dorner conveyor belts. Plenty on eBay. Either the Urethane or PVC belt may work well if coated with Garolite film or Kapton tape.by prot0typ1cal - Mechanics
DjDemonD, Look at polyanilines ( PANI ), and its family of conductive polymers. Been around longer than most plastics. They're used in making transducers, like photovoltaic cells, though not very rigid nor considered really flexible. Problem is it's usually an OEM material, and you'll need to synthesize it yourself, as sources are rare. Depending on the the base reagent, various colors can be foby prot0typ1cal - General
Naturally, an aluminum or steel frame to screw/bolt the panels. If you make panels out of cement fiber board, you could hold a propane torch to it and it would laugh. Good insulator as well, and cheap from any hardware store (also known as backer board and a hundred brand names). Then there's your FRP fiberglass or G10/FR4 garolite sheets, expensive but rigid. You can always opt for sheet metal,by prot0typ1cal - General
The Flex3Drive is an awesome innovation, especially the Duo. IMO, the Prometheus System may have an edge on filament swaps for a single nozzle. Yet to test my Prometheus hotend (not the system), soon, still building. You're correct about the Flexion mass, which is why I was looking at a dual cross bar solution. Still stuck in Makerbot land at that time, so was comfortable with that style directby prot0typ1cal - Extruded Aluminum Frames
You're welcome Initially was going to build a large Etch-XY, using a dual flexion: Opted for independent heads, and came up with Core-XYU:by prot0typ1cal - Extruded Aluminum Frames
Quotelkcl okay so after mulling it over for some time i came up with this design concept: Looks similar to my Etch-XY concept (CoreXY driven dual bar ultimaker carriage): Obviously, would benefit with a stacked belt arrangement, like the C bot.by prot0typ1cal - Extruded Aluminum Frames
Quotesangthip I don't seem to be able to find a belt layout of the Markforgd, can you point me to a site that shows this. The Markforged kinematics is posted on the 1st page of this thread (by me). I'm not negative, just realistic. Here's a "fixed" version of your "double-cross" that will work:by prot0typ1cal - CoreXY Machines
Quotesangthip The question is that, is this rough sketch-up, CoreXY, is it possible and will it work Not a CoreXY, or H-bot. Looks like a bastardized Markforged, only the delta B loop is doubled up (mirrored). Won't work. Both motors must synch for any movement to occur, and it can be either X, Y or both. No control IMHO.by prot0typ1cal - CoreXY Machines
PWM rotary vane pump. Only 50db, 24V option available.by prot0typ1cal - CoreXY Machines
Okay. flashed 1.19beta10... (Gene Wilder) It's ALIVE !!!!! (/Gene Wilder) Well, at least the brain is functioningby prot0typ1cal - CoreXY Machines
Lars, What you want is a rotary vane, not a diaphragm pump. Rotary vanes are much quieter, more efficient, and last longer. Oh yea, and more expensive :pby prot0typ1cal - CoreXY Machines
Must be nice to have 220V 3 phase. Of course then when I get home, I'd never sleep :pby prot0typ1cal - CoreXY Machines