#robotics Logs

Jun 14 2019

03:26 AM Jak_o_Shadows: The bushings make things easier eh
03:34 AM polprog: what are you going to do with that arm?
03:53 AM polprog: nice cat in the last one
03:53 AM polprog: heh
04:38 AM Jak_o_Shadows: hmm, can't seem to get much more than 10kg servos
04:38 AM Jak_o_Shadows: or like, 15 max
04:39 AM Jak_o_Shadows: unless you get crazy price
04:41 AM Jak_o_Shadows: Hmm. If i call it 6 servos in parallel, half it for conservative reasons, I can lift like 30kg.
04:41 AM Jak_o_Shadows: So, 10kg might be enough
04:45 AM Jak_o_Shadows: I should dig out the force code...
05:03 AM weyland|yutani: Jak_o_Shadows, use a planetary gear if you need higher forces they are very compact or is speed an issue?
05:07 AM Jak_o_Shadows: hmm. I haven't ever done velocity calcs
05:07 AM Jak_o_Shadows: I don't think speed is much of an issue.
05:07 AM Jak_o_Shadows: but like, i can cheap out here cause they are in parallel?
05:07 AM Jak_o_Shadows: this isn't for legs
05:17 AM weyland|yutani: yea you can stack planetary gears on top of each other
05:20 AM weyland|yutani: https://www.matexgears.com/stacking-planetary-gears-for-multiple-or-higher-reduction-ratios
05:23 AM weyland|yutani: https://www.youtube.com/watch?v=bWtK5mzuddo
05:27 AM logicmoo is now known as dmiles
06:31 AM Jak_o_Shadows: I can work out the gear ratio, even for planetary gears (been a little while though), but i dunno if I can be bothered doing the whole closed loop control thing
07:30 AM Tom_itx is now known as Tom_L
09:31 AM katsumi: weyland: nice tut. all i learned was 10/40=1/4
09:45 AM katsumi: https://de.wikipedia.org/wiki/Speedhub_500/14
09:45 AM katsumi: sry itS german
09:48 AM katsumi: i'm not a seller ;)
09:51 AM katsumi: i understand why ppl doin it from scratch, but if using standard parts it would be less expensive i think
09:52 AM katsumi: modular
06:45 PM logb0t_ is now known as logb0t
10:45 PM steelworker is now known as katsumi