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Rostock, Kossel, Simpson, 3DR, and more. See: http://reprap.org/wiki/Category:Delta. Previously named "Delta Robots and Stewart Platform"
Re: Delta-Reprap/Technik - 14 years ago
Die Kräfte an den Gelenken sind relativ klein, weil die beweglichen Teile alle sehr leicht sind. Ich habe schon etwa ein Kilo PLA mit meinem Rostock ausgedruckt und kann bisher noch keine Abnutzung feststellen. Falls die Kreuzgelenke irgendwann doch ausleiern sollten, kann man relativ leicht neue einsetzen.by Johann - Neue Ideen - Archiv
Re: Help troubleshoot Extruder - 14 years ago
Sorry, I think I fixed this bug before but must have forgotten to push the fix to GitHub. So now I have fixed it again: I'm still on vacation and can't test my change (return to Seattle now delayed by expired greencard) but James said it works for him.by Johann - Delta Machines
Re: Delta-Reprap/Technik - 14 years ago
Ja stimmt genau, mehr als 200 Segmente pro Sekunde ist zuviel Rechenarbeit (die sqrt Funktion ist relativ langsam auf dem Arduino) und dann wird die Bewegung ein bißchen ruckelig.by Johann - Neue Ideen - Archiv
Re: Delta-Reprap/Technik - 14 years ago
Die Z-Auflösung ist theoretisch 40 Schritte per mm (inklusive 16x Mikroschritte durch Pololu Treiber). Wenn man kleinere Zahnriemenscheiben benutzt kann man das auch noch verdoppeln. Ich glaub die mechanische / tatsächliche Wiederholbarkeit ist besser als 0.05 mm. Hier sind ein paar Bilder und Videos mit 0.3 mm Layerdicke (hoffentlich ist es okay dass ich diesen langen alten Thread vollposte):by Johann - Neue Ideen - Archiv
Re: Rostock delta robot now printing PLA at 50 mm/s - 14 years ago
Quick update: Rostock is now the most popular thing on Thingiverse, and has been featured on the front page. I am surprised and humbled that my prototype design is so well received. Several people are building their own Rostock prototype. Greg Frost is refactoring the OpenSCAD sources to make them more parametric. I'm starting to create documentation at reprap.org/wiki/Rostock and I could use sby Johann - Delta Machines
Re: Delta-Reprap/Technik - 14 years ago
Hallo, hier ist Johann, der den Rostock Delta entwickelt hat. Ich bin in Rostock geboren, habe in Stuttgart studiert, wohne in Seattle (USA), bin aber jetzt mit Frau und 3 Kindern im Urlaub in Deutschland bis 16. August. Der Airtripper Direktantrieb funktioniert super, weil ich nur 1.75 mm Filament benutze. Für 3 mm bräuchte man fast dreimal soviel Drehkraft. Mein Rostock hat RAMPS 1.4 mit ganzby Johann - Neue Ideen - Archiv
Re: Rostock delta robot firmware - 14 years ago
My modifications to the Marlin firmware are here: First I improved the G28 (home all axes) command: 1. Move all three carriages up until each hits the top endstop microswitch. 2. Now we know that the end effector is exactly centered at the top. 3. Move the end effector down and touch each of the three bottom endstops. 4. Use each bottom endstop to calibrate the zero position of that motor. 5. Aby Johann - Firmware - experimental, borrowed, and future
Rostock delta robot now printing PLA at 50 mm/s - 14 years ago
I created a blog with more updates and links: Airtripper's direct drive bowden extruder with MK7 drive gear from makerbot.com on NEMA17 stepper. PFA bowden tube: Silver PLA 1.75mm from ProtoParadigm MakerGear hotend with 0.5mm nozzle Slic3r 0.8.3 --layer_height=0.3 mm --perimeter_speed=50 mm/s --travel_speed=400 mm/s --scale=2 Minimug.stl Marlin modified for realtime delta geometry on Arby Johann - Delta Machines
Re: Rostock delta robot now moving at 400mm/s - 14 years ago
The printed PLA bushings in the pictures above are my own experimental design, but it was difficult to make them tight enough to keep the vertical carriages exactly horizontal and avoid binding. They would probably work okay if we put 3 printed PLA bushings on each vertical carriage, but I didn't want to print the carriages twice as tall. Currently I'm using LM8UU linear bearings (24 mm long) anby Johann - Delta Machines
Re: Rostock delta robot now moving at 400mm/s - 14 years ago
I purchased the LM8UU, LM8LUU and hardened 762x8 mm smooth rod and F608Z bearings from vxb.com, and the GT2 timing belt and pulleys from sdp-si.com. The motors are Kysan 1124090 Nema 17 from ultimachine.com. Kalle3D: RAMPS 1.4 supports 16x micro steps. My motors have 200 full steps per rotation = 3200 micro steps per rotation. The pulleys have 40 grooves with 2 mm pitch = 80 mm per rotation. 320by Johann - Delta Machines
Re: Rostock delta robot now moving at 400mm/s - 14 years ago
SanjayM wrote: > My grasp of the coordinate system here is weak, when you quote 30steps/mm in X/Y is that resolution > constant across the whole range of movement, or does it vary like a polar/SCARA type bot? The 30 steps/mm X/Y resolution is for the middle of the print bed. The X/Y resolution gets dramatically better near the edges of the print bed, because when the diagonal push rods areby Johann - Delta Machines
Re: Rostock delta robot now moving at 400mm/s - 14 years ago
Here are most of the plastic parts that I have printed for the Rostock prototype over the last 2 months: Lateral stability is okay but not awesome. I think I'll probably end up adding at least one vertical plywood or two diagonal metal tubes, which could also be useful for the cables to the top endstops and extruders. I'm currently implementing a better G28 homing routine in the firmware: firby Johann - Delta Machines
Rostock delta robot now moving at 400mm/s - 14 years ago
I'm working on a new delta robot 3D printer prototype called Rostock. It's still a very early prototype but it's now moving pretty reliably up to 400 mm/s. Build volume: 8x8x8 inches (20x20x20 cm) Extendable: 8x8x15 inches (20x20x38 cm) by using longer timing belts only Footprint: 12x12 inches Speed: currently up to 400 mm/s in all three directions Positioning accuracy: 40 steps/mm for Z, aby Johann - Delta Machines
Re: Helium Frog Delta Robot - 14 years ago
Is the Helium Frog Delta Robot still under active development? I haven't seen any updates in several months, but I really like the idea. So now I'm thinking about making a new derivative prototype with the following changes: 1. GT2 high torque timing belt (2 mm pitch) instead of threaded rod, to increase positioning speed. 2. Four vertical slides instead of three, to increase positioning accuracby Johann - Delta Machines
Re: Symmetric belt-driven extruder to remove stepper motor from X carriage - 14 years ago
I think this design may actually reduce backlash because in normal operation both belts will continue to move always in the same direction. To drive the extruder and push filament into the hot end, they will move in the opposite direction from each other all the time. Either one of them will move slightly faster or slower to move the X carriage back and forth, but they may never need to reverse tby Johann - Mechanics
Symmetric belt-driven extruder to remove stepper motor from X carriage - 14 years ago
Hi folks, I want to remove the stepper motor from the X carriage for Prusa Mendel, to reduce weight and increase precision at higher speeds. I think the X motion and extruder can be controlled by two independent timing belts with a stepper motor on each side. I have uploaded more pictures and a Sketchup model here: The X carriage is based on VertX (vertical X axis) by watsdesign: The oriby Johann - Mechanics