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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: Grounded Experimental Delta Printer - 11 years ago
Ah, I guess you looked them up? The best example of them is a video on youtube by wbeaty (of amasci.com fame). Everything the man says should be taken with a grain of salt, but he often has some interesting insights, useful ideas, and his list of "things that are wrong in textbooks" is great. There's quite a few more videos of them on youtube than there were when I first heard of them, but wbeatyby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
That is pretty damn neat. I wonder if you can do scratch holograms on basalt?by terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
While I'm about as far from an expert on 3D printers as you can get, since no one else has responded yet, I thought I'd give an explanation a try. The first thing to remember is that resolution can mean two different things with regards to a 3D printers. It can refer to the accuracy with which plastic is placed (dependent on the motors, the software, and limited by structural constraints that mby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
It occurs to me (as I'm sure it has to all of you) that there's no way it's going to get past even a meter before we start encountering structural issues. Plastic does not scale up all that well. Machining suddenly becomes a whole lot more important. We need a machine that can both print and machine with no structural changes, just a head swap. If we can print and machine, Simpson can continue toby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
@nicholas.seward: A macrocreation ratio of 1.1 is absolutely astounding. I was expecting something on the order of 20% larger each cycle, but more than doubling the length of the arms makes it a whole lot more practical. How much larger does it actually get with arms of twice the length? Can you then produce arms twice as large as the previous generation could, or is it a smaller increase? Alsoby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
@nicholas.seward: That's pretty much I was hoping for. I mean, obviously it's possible to tweak something as unclearly defined as the Simpson design until it can't macrocreate, but I was hoping that macrocreation would turn out to be the rule, rather than the exception. I suppose once the Simpson design is semi-finalized, the thing to do would be start finding the breakpoints. For example, a Siby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
I certainly wouldn't disagree with using metal arms for a milling simpson. I don't see why I'd want to replace the strings, though. 1/8th" dia. braided Spectra speargun line is 1050lb test, and extremely low stretch (parallel core). Very low friction, too, although that might cause some problems. I'll have to think about it, but I'm pretty sure you can make string tensioning work. edit: Ah, I seby terribleperson - Delta Machines
Printing Ferrites - 11 years ago
Disclaimer: I don't have any experience with 3D printing or mills, and little understanding of the behaviour of magnets. If I did, I probably wouldn't be posting this here. I am, however, quite a fan of 3D printing. I believe it's the future. So I'm trying to do my little bit to help. Recently Hackaday featured a 3D printed stepper motor. Of course, while neat, it didn't have many practical applby terribleperson - Paste Extrusion Working Group
Re: Grounded Experimental Delta Printer - 11 years ago
Is it just me or does the Simpson setup look pretty good for milling? I don't know much about milling (or even really 3D printing), but the Simpson appears to be far stiffer and more robust than most repraps. If you scale it up, I imagine the weight and the shape would negate most vibration, making it possible to mill steel (and potentially harder materials), rather than the usual 'wood and maybeby terribleperson - Delta Machines
Re: Grounded Experimental Delta Printer - 11 years ago
Annirak: You said something about wanting a bend sensor, but they're too expensive for your purposes. I remember the team I was on (1683) in FIRST FRC kludging together a bend sensor, I think. I also clearly remember linear sensor for a telescoping arm. I can't really remember how we did the bend sensor (or if we ever actually passed going "oh, yeah, we could do it that way), but I clearly remembby terribleperson - Delta Machines