#robotics Logs

Oct 29 2014

00:50 rue_house so I can use it in linear mode on my power supply
01:55 mrdata wow
04:08 deshipu rue_house: have you seen http://www.neuroproductions.be/experiments/6-axis-robot-arm/ ?
09:12 rue_house thats the one that was on HaD?
09:18 applepi Hi all :) so, i'm teaching a first tech challenge team and i need to bounce an idea they're pursuing and see if there's any way to make it plausible.. i'm very much a code monkey not a mechanical guy
09:19 applepi They have a requirement that their robot starts no larger than 18"x18"x18", but need to grow to ~48" tall, and they're wanting a conveyor belt system that grows to the height of the bot (up to 48")
09:21 applepi They're planning on having it just start slack and go up to 48" and be taut there, but I can see a lot of potential issues with that.. the belt slipping off or not lining back up right (this is a Tetrix belt, so it's really a chain/sprocket with conveyor paddles on the other side)
09:21 applepi Thoughts? Could it be made to work?
09:38 rue_house hm
09:39 rue_house it needs to have a conveyor belt?
09:43 applepi it doesn't need to, that's just their current design right now (that I've let them get far enough on that I'm trying to find a way to not have to ctrl-z it because of all the issues i'm suddenly seeing >_<)
11:24 Vetaxili Hi all. I wondered if someone could point me out to some papers with regards to model-based robots?
11:27 deshipu model-based?
11:29 Vetaxili In the book that I am reading "Probabilistic Robotics" there is a mention that the first major software design within robotics was model-based. I've been trying to research what exactly is the idea behind it and some example robots that use it but with no success.
11:30 deshipu no idea what that may mean
11:54 deshipu wolfmanjm: how is your robot going?
12:18 Steffanx I'm not sure if it's the same thing, but it could be the same thing or a form of deliberative control , deshipu
12:20 shipu bl
12:21 Steffanx deliberative control is(or was) a pretty common architecture
12:24 deshipu "The robot's entire state space is enumerated, and searched, from the current state to the goal state." <-- that sounds like a lot of work
12:24 deshipu especially when you have a humanoid robot with 56 degrees of freedom
12:27 deshipu I don't think anybody actually programs robots like that
12:28 deshipu first of all, you can often analyze the state space without enumerating all the states
12:28 deshipu second, you can use heuristics to direct your search of the optimal path
13:03 Steffanx is it an interesting read btw deshipu? Probabilistic Robotics ?
13:12 deshipu Steffanx: I have no idea, I've never seen it.
13:12 deshipu Steffanx: You might mean Vetaxili, but he left already.
13:14 Steffanx oh, yeah.. blame my client
13:14 Steffanx same colours of the nick :D
13:14 Steffanx sorry for bothering you :P
13:22 Loshki Steffanx: interesting would be pushing it a bit. It's full of equations. I would've preferred more exposition and fewer formulae in the main text.
13:23 Steffanx Ah ok, i know enough Loshki
19:20 ganzuul Sounds like the Kalman filter class of problems.
19:20 ganzuul Belief propagation...
19:31 deshipu hmm?
19:31 deshipu "belief" sounds bayesian
19:32 ace4016 hrm, he left
19:32 ace4016 model based sounds like regular control system problems
19:33 ace4016 classic and state-space
19:33 Loshki Yeah, it's all about bayesian belief systems, kalman filters, solving SLAM...
19:39 wolfmanjm deshipu: not much progress, been rebuilding my third 3d printer :) will get back to quadruped soon though I hope
20:19 rue_house 3rd!?
20:19 rue_house as in you have 3 or are on R3 of #1
21:07 wolfmanjm actually 4'th 3D printer, 3rd that I designed and built.
21:07 wolfmanjm I'm on rev 4 of the third design :)
22:34 rue_house cool
22:34 rue_house I'm still at 0.75
22:35 rue_house but I dont *need* a 3d printer
22:35 rue_house I can make things faster by hand
22:35 rue_house of what I make anyhow
22:36 rue_house as I build these robot arms I'm starting to make more and more of the same peices, so a printer has some merrit