#robotics Logs

Oct 30 2015

03:43 Jak_o_Shadows yo
04:05 deshipu veverak: great
04:07 deshipu veverak: I wish I could use Blender
04:15 Jak_o_Shadows I can!
04:15 Jak_o_Shadows Badly
04:18 veverak deshipu: same here
04:22 deshipu I had several attempts
04:22 deshipu because it would be super-useful to me
04:22 deshipu somehow I can't do the simplest thing
04:25 veverak yeah, most or less same experience
04:26 deshipu apparently you can control it with python in similar way to openscad
04:26 deshipu but I didn't manage that either
04:26 Jak_o_Shadows You can, but it's definitely not optimal
04:26 Jak_o_Shadows Plus, boolean operations on meshes are aweful
04:27 deshipu it's optimaler than stuff changing randomly whenever I move mouse
04:27 Jak_o_Shadows (Boolean operations on solid geometry is fine though)
04:27 Jak_o_Shadows Well, it's not a CAD program. It fundamentally doesn't have the same workflow
04:28 deshipu it doesn't seem to have any workflow
04:28 Jak_o_Shadows Oh it definitely does.
04:28 Jak_o_Shadows Start by blocking things out with the basic primitives, then adding loops where you need
04:29 deshipu loops?
04:29 Jak_o_Shadows A sequence of edges that forms a loop
04:30 deshipu I don't need loops, my robot is a topological ball
04:30 deshipu well, ignoring holes
04:30 deshipu but who needs holes
04:30 Jak_o_Shadows Well, loops are sorta how you make nicer 3D things.
04:30 Jak_o_Shadows What are you trying to make
04:30 Jak_o_Shadows ?
04:31 deshipu something simple like http://tote.readthedocs.org/en/latest/_images/gait01.png
04:32 Jak_o_Shadows well, because you're not doing complicated stuff, you could make that mostly out of primitives.
04:33 Jak_o_Shadows Start with a cube, scale and resize. Add a couple of loops so you can extrude the servo handles/bits you screw into. Then add another primitive for the round bit
04:34 Jak_o_Shadows Add another primitive whilst in edit mode*
04:34 deshipu right, I fail right at "scale and resize"
04:34 deshipu it scales and resizes in random axes
04:34 deshipu I make it look how I wanted, then rotate and it turns out it's completely wrong
04:35 veverak :)
04:35 verak g
04:35 veverak given
04:36 veverak that I've got python library that is aimed to CAD things
04:36 veverak and it can allready export it's hiearchy to scad
04:36 veverak I should be able to teach it the URDF too
04:36 Jak_o_Shadows ah.
04:36 Jak_o_Shadows well, just type the letter of the axis you want it to scale
04:37 veverak wow
04:37 Jak_o_Shadows wait
04:37 deshipu maybe I will try that later
04:37 veverak and if I will amke my volume/mass algos work again
04:37 veverak it will be full auto!
04:37 veverak :)
04:37 Jak_o_Shadows It might be middle clicking a few times, changing between axis as you do so.
04:37 verak needs d
04:37 Jak_o_Shadows After that you can just type in the amount you want it to scale
04:37 veverak (long night, you know)
04:38 deshipu Jak_o_Shadows: or maybe I just need to sacrifice a virgin? that always works with Windows
04:38 veverak deshipu: you didn't run out of virgins?
04:38 verak had to switch to linux because of
04:38 deshipu veverak: that's not possible in IT
04:39 veverak nah
04:39 veverak maybe modern generation IT finally changed something
04:39 Jak_o_Shadows Blender has a learning curve, but so does everything
04:39 deshipu yeah, ironic beards
04:39 deshipu Jak_o_Shadows: of course
04:40 deshipu maybe I need to steal a book
04:40 veverak hmm
04:40 veverak XML doesn't seem complex
04:41 deshipu it's a trap
04:41 veverak from the point of view " I have object hiearchy and how to create URDF from it?"
04:41 veverak oh, I ment URDF
04:41 veverak deshipu: it definetly is
04:41 veverak but best way to handle trap is to fall in it
04:41 deshipu everything is horrible and we will all die
04:42 veverak true
04:42 deshipu unless...
04:42 veverak and because of that
04:42 deshipu ah, no, forget it
04:42 veverak one should be live his live happily
04:42 veverak :)
04:42 Jak_o_Shadows Yeah, I don't know a good tutorial for blender nowadays
04:42 Jak_o_Shadows I started waaay back in 2.32
04:43 deshipu Jak_o_Shadows: I think they gradually become more detached from reality
04:43 deshipu became
04:44 Jak_o_Shadows Nah, they focused on their core market.
04:45 Jak_o_Shadows also had some big tech changes
04:46 deshipu market
04:49 Jak_o_Shadows Well, yeah. They're looking at artists mostly, not people who want to interact with the real world
04:49 Jak_o_Shadows Or engineers
05:11 veverak exactly
05:11 veverak :)
05:50 veverak deshipu: could I somewhere get that scad file of your tote?
07:20 deshipu veverak: it's all in the repo
07:21 deshipu https://bitbucket.org/thesheep/tote/src/d4b9d93111c117ff6dc11e50a5c67536c898e6e9/doc/scad/?at=default
08:19 Xerrass hmm
08:19 Xerrass any ideas for a cheap chain vehicle ?
08:19 Xerrass max 30cm long ?
08:20 Xerrass im thinking of building it myself but from where will i get the chains ?
08:21 Xerrass btw is there a lets say preerd seller
08:26 veverak tamiya makes something
09:01 LiohAu_ veverak: did you succeed to create your URDF file?
09:01 veverak work in progress
09:07 LiohAu_ veverak: you're discovering the URDF format? or you already made some urdf files previously?
09:07 veverak other stuff to thing that will generate it
09:08 LiohAu_ hu?
09:08 verak got python cad
09:08 veverak some other things to solve first :)
09:08 LiohAu_ oh ok;
09:09 LiohAu_ FYI there's a solidworks URDF exporter
09:09 LiohAu_ you cold inspire of it
09:09 LiohAu_ could*
10:06 veverak hmm
10:06 veverak I sometimes suprise myself
10:07 veverak forgot that I can render threads
14:35 slidercrank http://playfulmachines.com/DEP
14:35 slidercrank 'Just like humans': Robot simulation can move, interact without instruction
15:23 knob slidercrank, those videos are awesome with "Mr Robato" background music
16:26 LiohAu deshipu: here?
16:33 deshipu LiohAu: yes
16:35 LiohAu good :P
16:35 LiohAu I just don't remember what I wanted to ask :D
17:24 SpeedEvil http://imgur.com/gallery/A4kX2tr ten legged walker.
19:11 anonnumberanon SpeedEvil, this sucks.
19:19 SpeedEvil ?
20:09 veverak nah
20:09 veverak anybody any tips
20:09 veverak for webpage with table of dimensions for countersunk screws?
20:09 Jak_o_Shadows What exactly are you wanting?
20:09 verak is putting DB of such a dimensions in coding-friendly format and it seems as only thing that is mis
20:09 veverak http://www.fairburyfastener.com/xdims_metric_nuts.htm
20:09 veverak something like this for countersunk screws
20:09 veverak ;)
20:10 veverak -> actual html code, not img!
20:10 veverak metric if possible
20:12 veverak https://github.com/SquirrelCZE/pycad/tree/master/pycad/data/models
20:12 veverak work in progress
20:16 Tom_itx veverak,, http://www.franciskirk.com/_includes/docs/pdf/87.pdf
20:16 veverak and how the hell I am supposed to parse that into HTML ?
20:16 veverak *json structure
20:16 Tom_itx you didn't say deliver it on a platter
20:17 veverak but this is nice
20:17 veverak looks computer generated -> there is a chance
20:17 Tom_itx should be quite complete
20:17 veverak mine... "mechanical tables pdf" is scanned
20:21 Tom_itx http://sigmafasteners.com/catalog/SigmaCatalog.pdf
20:22 veverak looks
20:22 veverak like I can at least copy/paste it
20:22 veverak Tom_itx: that's a away!
20:23 Tom_itx plagiarism
20:23 veverak ture :/
20:23 veverak damn it, haven't thought about licenses
20:28 jason__ licenses on the dimension of screw information?
20:36 Tom_itx dunno
20:36 Tom_itx do you have them in your pocket?