#robotics Logs

Sep 22 2017

12:41 AM rue_house: ok, if a polygon is concave, its angles dont add up properly
12:45 AM rue_house: hmm, my colour 3d lines use pointers to its points, so I can have just 1 point cloud, with the lines just being relations between them
12:45 AM rue_house: none of my other stuff does that right now
12:46 AM rue_house: I'm going to need a function that can search for lines that cross
12:50 AM rue_house: I'm still not sure how to break up the polygon into triangles nicely
12:51 AM rue_house: breaking it up into convex polygons seems like a good start
07:38 AM robotustra: morning
09:02 AM rue_bed: morning
09:06 AM deshipu: lies
09:37 AM rue_house: / RotationAngle is in radians
09:37 AM rue_house: x = RotationAxis.x * sin(RotationAngle / 2)
09:37 AM rue_house: y = RotationAxis.y * sin(RotationAngle / 2)
09:37 AM rue_house: z = RotationAxis.z * sin(RotationAngle / 2)
09:37 AM rue_house: w = cos(RotationAngle / 2)
09:37 AM rue_house: arg it all makes sense now!
12:45 PM DagoRed: I just want to go home and work on my mandelbrot stuff. Stupid work is in the way.
12:48 PM Snert_: I just want to go home and work on punching down ethernet jacks in my living room. Stupid work is in the way.
12:49 PM Snert_: ... and it ain't even $day :(
01:48 PM weyland|yutani: Snert, why?
03:01 PM peepsalot: anyone here messed with making a cycloidal gearbox?
03:02 PM peepsalot: seems like a great option for robot arms and other stuff
03:18 PM mumptai: mfg. requirements seemed to high to just print it
04:38 PM peepsalot: well i'd print it mostly but i'm thinking of using steel rod for the housing pins, and pressing steel roller bearings in for the main input/ouput shafts. possibly also on the carrier pins
04:38 PM peepsalot: more bearings = more better
04:43 PM peepsalot: mumptai, i didn't think it required particularly tight tolerances
04:43 PM Tom_L: https://www.thingiverse.com/thing:1824742
04:43 PM mpiii: [ Fully-functional Hand-cranked Hypocycloid Speed Reducer Model by otvinta3d - Thingiverse ] - www.thingiverse.com
04:50 PM mumptai: hmm, well build a prototype
04:50 PM mumptai: high-torque servo axis would be cool
05:22 PM peepsalot: yeah there's also this design which i'll probably base my version off of: https://www.thingiverse.com/thing:8348 since i'm wanting it to be parametric
05:22 PM mpiii: [ Cycloidal Speed Reducer in OpenSCAD by mattmoses - Thingiverse ] - www.thingiverse.com
05:24 PM peepsalot: i was just curious about the geometry of the profile because it looks slightly off to me, but i hadn't yet dived into the scad code to examine the equations/algorithm used
08:36 PM gloops: quick question, any app for making gcode for robot arm cnc?
08:36 PM rue_house: hmm a part number under 10000
08:55 PM veverak: hmmm
08:55 PM veverak: I am fucked
08:55 PM veverak: ok, just realized that somebody did what I wanted to do
08:55 PM veverak: as my tehsis
08:55 PM veverak: using mechanisms I wanted to use
08:56 PM veverak: anyway, it showed quadruped robot being able to move through pipe filled with obstacles
08:56 PM veverak: that's cool
08:56 PM veverak: :D
10:34 PM rue_shop3: hmm