#robotics Logs

Dec 28 2020

08:18 AM rue_bed: hmm
08:24 AM rue_bed: I have an AI idea, for learning
08:38 AM ace4016: hrm...
08:38 AM ace4016: any plans to share the idea? :P
09:21 AM rue_bed: if I can get a demo even remotly working :)
09:21 AM rue_bed: (I'm playing with it)
09:21 AM rue_bed: not sure how to close the loop
09:22 AM rue_bed: have you ever seen how cdrom balancers work?
09:26 AM ace4016: nay
09:27 AM rue_bed: they repeatedly calculate the imbalance and correct for it, in just a few revs they have it all worked out
09:28 AM rue_bed: you can hear the counterbalances rattle when the drive spins down
09:29 AM ace4016: hrm
09:29 AM rue_bed: they use up to 300 cores to do the math
09:31 AM rue_bed: each one of them realtime calculates vector forces during the rotation, for correction values
09:31 AM rue_bed: they don't take the error to zero just down below a threshold
09:34 AM rue_bed: the selection of which weights to move is the interesting bit
09:36 AM rue_bed: you see, lots of them become redundant, so there are a LOT of solutions to any given problem
09:37 AM rue_bed: and they always zero in on one that works within whats needed
09:38 AM rue_mohr: did you ever play with legos?
09:39 AM ace4016: a little. also, this sounds similarish to an application i worked on at work for propeller balancing
10:11 AM Tom_L: rue_mohr, sure that's not just PID?
10:12 AM Tom_L: smells alot like it
10:12 AM rue_mohr: balancing 300 counterweights
10:12 AM rue_mohr: balancing a shaft using 300 counterweights
10:12 AM Tom_L: like a washing machine does with energy
10:13 AM rue_mohr: hah, my washing machines doesnt :|
10:13 AM rue_mohr: AAAAAAHHHHH STOP IT QUICK!!!
10:13 AM Tom_L: calculates imbalance and adjusts current to help even it out
10:13 AM Tom_L: mine also does that if i put too many non-like articles in
10:14 AM rue_mohr: does it eject everything but the white socks?
10:14 AM Tom_L: heh
10:14 AM Tom_L: no
10:15 AM Tom_L: btw, nothing new is as good as it's older counterpart
10:15 AM rue_mohr: yea, my machine is 35 yrs old and I'v replaced a $12 set of aggitator dogs
10:16 AM rue_mohr: that said, it could use a new timer, the "normal" cycle has a dead spot
10:16 AM rue_mohr: do I know enough to do that now?
10:17 AM Tom_L: i replaced mine after probably 40 yrs and have done so probably thrice
10:17 AM Tom_L: they don't live long anymore
10:18 AM rue_mohr: maybe if I used an absolute encoder, I have two
10:18 AM rue_mohr: german made
10:18 AM rue_mohr: I thought you got a new one and the bearings went after a month
10:19 AM Tom_L: a bit longer than a month but yeah
10:19 AM Tom_L: that was a front loader i replaced the bearings on probably 3x
10:19 AM rue_mohr: did you go back to your old one?
10:19 AM Tom_L: back to top load now
10:19 AM rue_mohr: heh
10:20 AM Tom_L: my old one is probably a chinese car now
10:20 AM rue_mohr: oh :(
10:20 AM rue_mohr: you got a new topload?
10:20 AM rue_mohr: or an old topload
10:20 AM Tom_L: not new now but new then
10:20 AM Tom_L: i've replaced bearings on it 2x
10:21 AM Tom_L: so far the last one is holding
10:21 AM Tom_L: i packed the shit out of the seal with grease
10:21 AM rue_mohr: hmm
10:21 AM Tom_L: enough i don't need a diagram to fix it anymore
10:21 AM rue_mohr: you had to replace bearings in a topload?
10:23 AM Tom_L: yup
10:23 AM Tom_L: i got a spare shaft and press kit for it too
10:25 AM rue_mohr: how did you know the bearings went?
10:25 AM rue_mohr: noise?
10:25 AM Tom_L: yes
10:25 AM Tom_L: it was very clear
10:25 AM rue_mohr: huh
10:26 AM rue_mohr: I wonder how long mine is good for
10:26 AM Tom_L: ran it that way for quite a while
10:33 AM Tom_L: the factory wanted $300 for the tub/bearing assembly to replace a $15 bearing
08:53 PM rue_mohr: who was looking for advice on PID
08:53 PM rue_mohr: I forgot a really important hint
10:18 PM Jak_o_Shadows: veverak and I were talking about it?