#robotics Logs

Sep 19 2020

01:03 AM rue_mohr: RifRaf, !
01:09 AM rue_mohr: how are you doing!!!
01:22 AM RifRaf: G'day Rue, been well thanks, and yourself?
01:23 AM RifRaf: got to make bbq for mrs b'day, but will try be around later
01:28 AM rue_mohr: irc got quiet and I been playing with twitter
01:29 AM rue_mohr: found some neat people
01:29 AM rue_mohr: you still working with cnc?
01:53 AM rue_shop2: arg, the table needs a re-level too
03:27 AM mun: anyone know why Amazon's robot uses a large teethed ball screw rather than several linear actuators? https://robohub.org/meet-the-drone-that-already-delivers-your-packages-kiva-robot-teardown/
03:52 AM rue_mohr: compliance?
03:54 AM Jak_o_Shadows: The hollow-ness is pretty nice
03:55 AM Jak_o_Shadows: and having a single system, rather than multiple?
04:10 AM mun: rue_mohr hmm what sort of compliance?
04:14 AM mun: Jak_o_Shadows true, i guess fewer things to break. but the same could have been achieved with two actuators. that's a lot of work to cut down by one actuator
04:16 AM rue_mohr: dont know, its the only reason I can think of now
04:23 AM mun: could it be that because they use differential steering and the shelves are too heavy to steer accurately?
06:58 AM RifRaf: rue_mohr still kinda doing cnc, have finished the router but is far away currently
07:00 AM RifRaf: workin as drafter in big sheet metal factory, lots of lasers and presses so can get stuff made which is cool, but very busy place
07:00 AM veverak: hmm
07:00 AM veverak: wait, it is you
07:01 AM veverak: RifRaf: by any chance, have you ever designed frame for prusa i3 out of 4mm metal sheets that lock together?
07:01 AM veverak: (and send it to ... me? :D )
07:01 AM RifRaf: yes a few
07:01 AM veverak: !!! so it is you
07:01 AM veverak: RifRaf: thanks ma, that thing was rock solid on the printer for 5 years
07:01 AM RifRaf: its me, been awol for some time
07:02 AM RifRaf: yep veverak mine are still strong as well :)
07:02 AM veverak: I kind of put that thing away
07:02 AM veverak: other parts of it were not good and at that point, it was either "throw it away or rebuild everything"
07:03 AM veverak: (brother of mine took it, he wants to convert it to laser engraver)
07:05 AM RifRaf: yep should work perfect for laser, have got many many still that i wish i could use for something
07:06 AM RifRaf: but the printers are so cheap now, will likely all go in the bin
10:45 PM Jak_o_Shadows: What are the springs in the legs for? https://www.youtube.com/watch?v=MEhJzbhxm8A
10:47 PM Tom_L: possibly to keep from stripping the gears?
10:47 PM Tom_L: it will give under a certain pressure
10:48 PM Tom_L: @.50
10:48 PM Tom_L: @ :50
10:49 PM Tom_L: pretty sure that's what they're for
10:50 PM Jak_o_Shadows: So the horns slide in the slot, spin freely, then work fine?
10:51 PM Tom_L: without physically inspecting it, i'd say so
10:51 PM Jak_o_Shadows: Because hobby servos, won't you need to move it back after?
10:53 PM Tom_L: @ :20
10:53 PM Tom_L: or possibly gives a little 'bounce' to the step
10:55 PM Tom_L: more likely the latter
10:55 PM Jak_o_Shadows: I mean, I'm a fan of that
10:56 PM Tom_L: @ :21
10:57 PM Tom_L: the light grey part can't turn so it's not to prevent stripping the servo
10:57 PM Tom_L: it's a 'shock absorber'
10:58 PM Jak_o_Shadows: I like it