#robotics Logs

Jul 04 2015

05:14 Jak_o_Shadows I saw that
05:14 Jak_o_Shadows sad
05:19 Anniepoo 8c(
05:19 Anniepoo 8c/ One advantage of 'Baxter' type robots is that they're safer
05:21 Jak_o_Shadows One specific disadvantage of tghe baxter robot is that it's not as repeatable
05:22 Anniepoo yes, but my repeatability is just as bad,or worse, and I manage to make stuff
05:22 Jak_o_Shadows You're better at figuring out when you stuff up
05:23 Anniepoo true, true
06:42 SpeedEvil Either can kill you if you get in its way.
06:43 SpeedEvil If you go into the cage, or do not lockout/tagout your robot when in range, you almost deserve what you get as a manager/worker.
06:43 SpeedEvil No more or less than if you get cooked in with the tuna in a massive oven, or ...
06:44 SpeedEvil 'baxter' type robots - assuming you mean ~humanoid shape - are very limited in work envelope
06:45 Jak_o_Shadows baxter is a specific type. Yeah, it's vaguely humanoid
06:47 SpeedEvil But large powerful machinery of any sort can kill you dead if you get inside the guard radius, or use it wrong.
07:26 elektirnis hi
07:26 elektirnis I have a weir question...
07:27 elektirnis is it posible to get vacuum using compressed air?
07:28 Tom_itx vortex
07:29 elektirnis found it http://www.airvacpumps.com/pumpoperation.html
07:29 elektirnis hm
07:29 elektirnis wonder whats the efficiency
07:29 elektirnis would it be enough for vacuum table..
07:29 Tom_itx low
07:29 Tom_itx vaccuum cleaner
07:29 Tom_itx with active cooling
07:29 Tom_itx or you'll burn it up
07:30 elektirnis was at this trade show some time ago
07:30 elektirnis there were universal robots presented, picking up stuff
07:31 elektirnis they used similar tech to create vacuum
07:31 elektirnis of course you have to limit airflow
07:46 deshipu oh no they tasted human blood now we are doomed
07:49 SpeedEvil Tom_itx: simply allowing some airflow works
07:53 Jak_o_Shadows Isn't that basically a carby?
07:59 elektirnis http://www.airvacpumps.com/AVpump.html
07:59 elektirnis I wish I could understand all those weird imperial units
08:00 elektirnis like using fingers and legs as measurement units.
08:15 vegombrei a
08:15 vegombrei \q
09:38 ace4016 elektirnis, i see Europeans can't do maths or read eh? (there's a button on the page to select metric)
09:39 elektirnis yeah, only yanks can do maths
09:40 ace4016 of course, that's why we're the bestest! :D
09:41 elektirnis bestest
09:45 deshipu calculations is not math
09:46 deshipu it's so simple even computers can do it
09:46 veverak guys
09:46 veverak anybody using pololu maestro?
09:46 deshipu me
09:47 veverak is there a way to tell it
09:47 veverak no
09:47 deshipu no
09:47 veverak let's say I have program that controls something
09:48 deshipu like a corpse grinder?
09:48 veverak is there some sane way to setup it, that when program crashes
09:48 veverak pololu is set to default values?
09:48 veverak it's airship controlled by arm
09:49 veverak but when I killed program with motors on, it is still going on
09:49 veverak and that is kind of not good
09:49 veverak only thing that comes to my mind is to setup watchdog that resets program or setups it yourself
09:52 veverak *by ARM device
09:53 veverak because, it's kind of logical that pololu can't detect that program that controlled it crashes
09:53 veverak nah
09:55 deshipu how would it know if it crashed?
09:56 veverak pid file + checking if process is running?
09:57 veverak come to think of it
09:58 veverak I can propably kill it and restart it over ssh
09:58 veverak so, backups are: restarted by watchdog if it crashes (program exited), ssh to restart manualy
09:59 deshipu I doublt polulu maestro can ssh
09:59 veverak nononono
09:59 veverak I am not running program on pololu
09:59 veverak I have ARM device that sends commands to pololu maestro
09:59 veverak and program runs on arm device
11:15 deshipu so what does the maestro have to do with it?
11:16 deshipu you can set it up to return the servo to default position on error
22:24 rue_shop3 without knowing the characteristic of the load, I cant used a fixed dv/di to limit the output current of my power supply
22:24 rue_shop3 I think I have to integrate the overload signal
22:29 rue_shop3 maybe there is a way to imply the impedence by knowing the current and the voltage
22:30 rue_shop3 tho I suspect that would require a variable gain amp
22:30 rue_shop3 I wonder if all this would be easier to do in PFM
22:32 rue_shop3 so, if the current is over the limit, you want to knock it back
22:32 rue_shop3 but you might want to knock it back a lot or a little
22:32 rue_shop3 so, you almost want to know di/dt
22:33 rue_shop3 oh hmm
22:33 rue_shop3 if I look at this like a servo
22:33 rue_shop3 where I'm controlling the rate electrons flow into the load
22:34 rue_shop3 hmm
22:34 rue_shop3 maybe I should look at this like a votlage limited current source
22:34 rue_shop3 I wonder if there is a voltage controlled clipper out there