Great work for a minimum vitamins/parts robot. I'm humbled by the knowledge of some guys on these forums. I wish I had half of your knowledge to finish my own reprap project. Well... keep it up.by realthor - Polar Machines, SCARA, Robot Arms
The plan is to reuse some already existing firmware and Morgan FW seems the right choice. If I only use one side for the ForeArm then it is basically Morgan without the second pair of assisting arms. The big plan is to use Morgan for a print then home to the other side and print another print using Morgan FW, then, when done, home again to the first home, kicking the part off in the process, etcby realthor - Polar Machines, SCARA, Robot Arms
Quotecozmicray You sure like to write and in 5 or 6 different forums? Perhaps a Rube Goldberg forum also --- but you may need way more complicated steps/mechanisms and this suggestion may not be complicated enough for your system And yet you're reading all of those ... and providing your wise friendly answers ... to all of those.by realthor - Polar Machines, SCARA, Robot Arms
Something like this for an onboard tensioning for Z? Two small pulleys keep the wire vertical while it is tensioned by pulling the line with a screw.by realthor - Polar Machines, SCARA, Robot Arms
Quotetheothermike Second question: Already tried to run the Morgan-software as-is and move some motors with it? I had no success up to now. @theothermike: I'm sorry that Morgan doesn't yet work for you. I'm more scared now because your setup is quite like Morgan while mine is just hinting at Morgan. If I restrain the movement to one side it should basically be Morgan without the assisting armsby realthor - Polar Machines, SCARA, Robot Arms
@Cozmicray: I am trying to follow... ok, so this is a PULL-PULL system. Each half loop (red line/blue line) pulls to rotate while the other half gives. Makes sense. This is true for all 3 systems on board. The 2 SCARA components and the Z capstan/winch. We were talking about the SCARA part in the previous post, I disregarded completely the Z for now, it's a good thing you brought that up. For thby realthor - Polar Machines, SCARA, Robot Arms
Tensioning is "a)" on my ToDo list . First of all I am not sure that having two separate loops to rotate to each side is such a good idea as I will have to tension each loop independently. This brings the issue of applying the exact same tension on each loop. Then I have some doubts that I can actually tension the wire behind the bolt. The mechanism of rotation transmission from bolt to drum iby realthor - Polar Machines, SCARA, Robot Arms
Hello guys. I am designing a new RepRap style single-Arm SCARA printer that has all its motion transmitted via fishing line and it's mostly plastic constructed. The whole project idea came from previous great work done with Wally and Morgan but my engineer within wanted to take this further with the rep-rappiness. This thread is to document my WIP and get advice from the true engineers and builby realthor - Polar Machines, SCARA, Robot Arms
I can't seem to be able to edit my previous post anymore. I wanted to add that a tapered drum might not be scalable should i decide to have a longer Z. The Z depends on accuracy of the printer and if accuracy is achieved and the non-Z accuracy is good enough to prevent Pisa-tower prints then the potential of Z is limited only by the length of the "threaded spur gear" spool. Here's a recent screeby realthor - Mechanics
I think that it would be similar to do the compensation in software, which would be in fact easier as long as the same trigonometric functions would have to be used. But I tried to recycle the existing code in the firmware and my design only needs some parameters adjusted. Second reason was that my solution above is a challenge for my engineer within , i haven't seen it used elsewhere and wantedby realthor - Mechanics
100lb Spectra line is .56mm in diameter (Model: 21101500300Y), so for a 25-30mm 3D printed bolt it wouldn't make much of a difference. I am more concerned about wormgear to straight spur contact, as it's not the most optimal. The best contact is a double throated worm gearing, as exemplified in the following images: For my design the drum is a straight teeth spur gear so the best I can hope fby realthor - Mechanics
Hi guys, I am pretty new to reprap forums so please bear with me. I can't apparently delete a post I've made in another thread. I think this post fits better in the mechanics category so I will also post it here. If i am breaking any laws on the forum please let me know. I hope I am not I've been posting for a while (and still do) on Nic Seward's ConceptForge about a Wally without the radial orby realthor - Mechanics
Hi guys, I am pretty new to reprap forums so bear with me. I've been posting for a while (and still do) on Nic Seward's ConceptForge about a Wally without the radial or linear Z and without a threaded rod or leadscrew. I know little is left but in many parts of the world these parts are difficult to find and there are other reasons as well. Over several posts I've come to an idea of a winch thatby realthor - Let's design something! (I've got an idea ...)
I have read this thread a few weeks ago and noticed the animation in the same post you linked me to. I never knew about the Sarrus linkage and when I stubmled on it somewhere on the internet I remmembered seing it in this forums. I thought that after so many years we're still falling back to that solution sometimes, at least conceptually. That's why I thought it was funny. Cheers.by realthor - Polar Machines, SCARA, Robot Arms
funny thing ... "Sarrus's linkage Historically, the first straight line linkage was described by Sarrus in 1853. It differs in that its parts move in three dimensions. It is applied widely in jacks, elevating platforms and similar devices. " Sarrus's linkage video on youtubeby realthor - Polar Machines, SCARA, Robot Arms