#robotics Logs

Apr 24 2015

07:58 SpeedEvil Does anyone have any suggestions on a source of nice cheap gears that can cope with ~80NM or so of torque?
08:06 SpeedEvil I guess on reflection bike stuff is pretty close.
08:39 rue_bed SpeedEvil, use the power train of a disability cart
08:39 rue_bed then you get a motor, gearbox, and diff
08:40 SpeedEvil hmm
08:40 SpeedEvil Not an unreasonable point.
09:04 rue_house I did a capacity test on one of the batteries on the lawn mowing robot, its an 18Ah 12V battery, the capacity test came out to 2.3Ah
09:05 rue_house I think I'll call that one dead weight
09:06 eedEvil wishes he could go over the stuff at the local recycling cen
09:06 rue_house they have retention eh?
09:07 rue_house make a public issue that there needs to be a reuse centre that proxies the recycling centre
09:07 rue_house so that only if things catn be REUSED are they recycled
09:08 rue_house wow, it just dropped like a rock when it died
09:08 GuShH SpeedEvil: become friends with someone who works there!
09:09 SpeedEvil yeah - alas not really possible for health issues.
09:09 GuShH "health issues"
09:09 SpeedEvil I'm barely coping with the stuff I have to do.
09:09 GuShH oh yours
09:09 GuShH I thought they imposed that.
09:09 GuShH (was thinking "CRTs had leaded glass... but... everything else must be processed first to become really dangerous")
09:10 GuShH they were bashing the tubes in, and some glass "dust" could go airborne, that's what came to mind first. oh and maybe microwave ovens?
09:10 GuShH are they still dangerous?
09:10 ShH hugs Speed
09:10 SpeedEvil There is in principle dangerou ststuff in various items.
09:10 GuShH I'm always in pain (back) I should be on constant medication but I avoid it for other health reasons.
09:11 SpeedEvil Including BeO in the magnetron
09:11 GuShH So it's still used
09:11 GuShH or well, recycling centres would still be receiving old stuff as well.
09:11 GuShH the only major upgrade was the switch mode supply on those ovens then
09:11 GuShH for cost reasons, are they more efficient?
09:11 SpeedEvil 'sharp' stuff and cutting yourself is much more dangerous, in general
09:11 SpeedEvil yes
09:12 GuShH Does it show that I haven't owned a microwave oven in over a decade?
09:12 GuShH heh
09:12 SpeedEvil microwave inverters are interesting
09:12 SpeedEvil they produce 4kV p-p @ 30KHz
09:12 GuShH Haven't played with them yet
09:12 SpeedEvil this is awesome for connecting to a concroft-walton multiplier or similar.
09:13 GuShH I thought it was cock-something walton.
09:13 SpeedEvil Using _MUCH_ smaller caps to make - say - 200KV@2KW
09:13 SpeedEvil typo
09:13 GuShH word association is how I remember stuff!
09:14 GuShH Are they well filtered in general?
09:14 GuShH I can imagine the cheaper ones could be producing a lot of noise.
09:14 GuShH Heck CFLs are noisy, in some environments you can't have them around
09:15 SpeedEvil They are filtered well int heir intended use.
09:15 ShH wonders if the volcanos will bother him or
09:15 SpeedEvil If you take them out, then you're gonna need to shield
09:15 GuShH A friend lives nearby, his car is covered in ashes.
09:15 GuShH Everything is grey
09:15 GuShH (near Chile)
09:16 GuShH 40 years dormant
09:16 GuShH or 44.
09:16 GuShH There's a video showing a possible UFO, I think it was a quadcopter / drone
09:16 GuShH but the lightning strikes were awesome, you should watch the videos
09:17 ShH realizes he's traveling 300KM toward the volcanos, i
09:18 GuShH SpeedEvil: that applies to almost everything, then again this is NOT the intended use for those inverters
09:18 GuShH But are they protected at all on the output?
09:18 GuShH because I imagine the magnetrons aren't prone to shorts or that type of failure, I think.
09:18 rue_house if I'm ever a UFO, I'll make sure I look like a quadcopter just to confuse everything
09:18 GuShH so maybe cost wise.....
09:19 rue_house has everyone heard about aluminum ion batteries?
09:19 GuShH rue_house: haha, you can't tell from the video but it does have lights and it floats near the volcano, I think if they were filming they wouldn't be using lights
09:19 GuShH no
09:19 GuShH I mean you can't tell what it really is
09:19 GuShH I'd like to see a chart on UFO sightings from 90s to now, I bet they've went waaaaay up due to quadcopters and such!!
09:20 GuShH specially the film crew / professional drones which are big
09:20 GuShH (at least for unobstructed outdoors shots)
09:20 GuShH they can track objects / vehicles and with the stabilized cameras it's awesome.
09:21 GuShH I'd like to see one for 360� video
09:21 GuShH there's a 360� cinema at the interactive zoo here, pretty neat.
09:21 GuShH (sadly you miss most of the action if you don't move around)
09:22 GuShH never quite got the point of it, I guess if the video was made so you only had to track one object with your sight, that would work fine, but multiple objects nope.
09:23 GuShH (that cinema is made almost like a spaceship, so you feel like you are traveling in a UFO, hence related to the topic, pretty neat)
09:23 rue_house http://ruemohr.org/~ircjunk/images/12V18AhN1.svg
09:24 rue_house that, for reference, is the curve of a 2.3Ah battery being discharged at 0.9A
09:24 GuShH nice curve
09:24 rue_house I think I'll retire that battery
09:25 GuShH capacity wise?
09:25 rue_house its an 18Ah battery, its got the capacity left of a 2.3
09:25 GuShH crap I'm anxious, I'm traveling to a new place and there's nobody waiting at the point of arrival :(
09:25 rue_house it should have lasted 72000 seconds
09:25 rue_house oo, sucks
09:26 GuShH well she will be later on, she gets off work at 5:30, I'd probably be there at 5.
09:26 GuShH seems the boss doesn't like their employees leaving early!
09:27 GuShH but it's ok, I'll find something to do or waste money on, or perhaps something to look at.
09:27 GuShH rue_house: I'd say, retire!
09:28 rue_house there always seems to be a knee in the graph between the 12V and 11.8V mark
09:28 rue_house even on the good batteries
09:29 GuShH that's not an artifact?
09:29 rue_house nope
09:29 rue_house on that battery, its where it suddenly drops
09:29 rue_house on a good battery, the slope changes
09:30 rue_house I'm thinking that 11.9V is a better cutoff for a 12V lead battery
09:33 GuShH most likely
09:35 rue_house that was the bad battery, I wonder how the "good" one is doing
09:36 rue_house hmm 12%
09:39 rue_house that load test was 0.9A
09:39 rue_house who can tell me the Wh I got
09:40 rue_house I got about 19Wh
09:40 rue_house ?
09:42 SpeedEvil I was depressed when I realised that I can't make a tethered quadcopter.
09:42 SpeedEvil Simply as my incoming mains - 80A*240V - is not really sufficient to drive a ~10kg or so payload.
11:27 iveevue Hello all
16:46 beanbag rue_BMCC
16:50 beanbag RUE_I_GOT_MORE_NICKS_THAN_CARTERS_GOT_PILLS_SKITZO_NUCK
16:53 beanbag so anyone here object to a hakko fx-888d as a good iron to buy
16:53 beanbag my sparkfun/atten 50w just ate another $20 handle and it sucked on rohs anyways
20:24 Jak_o_Shadows mm, 3d printer power supply blew up when it tripped the safety switch the other ay
21:02 rue_house is it a Daytek?
21:02 rue_house or OneDay?
21:02 Jak_o_Shadows like, last week
21:02 rue_house the brand
21:02 Jak_o_Shadows no discernable brand.
21:03 Jak_o_Shadows hang on
21:03 Jak_o_Shadows it's a codegen 350@
21:03 rue_house huh
21:04 Jak_o_Shadows it was about 13 years old
21:38 rue_house huh
21:52 Hyratel do anyone have any suggestions for affordable analog joystick pivotsets? all I can find are industrial sticks or thumbsticks, or way-way overpriced arcade-style units
22:18 rue_shop3 I just added a Wh accumulator to my load tester
22:19 Jak_o_Shadows and the3d printer is running again, with a different (better) power supply