#robotics Logs

Nov 17 2015

01:12 rue_more but who wants rs232 anymore?
01:32 rue_more wow, I totally fall asleep
01:33 rue_more fell...
01:37 maiden nice :D
01:37 maiden happens to me all the time :p
01:37 rue_more usually I wake up a while before bedtime
01:49 maiden ok, i usually fall asleep way after bedtime ;)
03:16 anonnumberanon hi
06:02 Jck_true This is gonna sound insane... But suppose I wanna build a completely sealed robot. How would I get a drive shaft out of it? Is there anything like rare earth magnets that can transfer the thrust through 3mm acrylic glass?
06:04 veverak it's propably easier to just make it not-completely sealed
06:05 veverak but make proper ... arrangments around the shaft that leaves the robot
06:05 veverak there are various ways of doing it that are close enough to "completely sealed" state :)
06:06 deshipu Jck_true: sealed against what?
06:06 Jck_true salt water
06:06 deshipu Jck_true: just use grease
06:06 Jck_true That enough for submersion to 2 meter?
06:06 deshipu Jck_true: put the shaft through a long hole filled with technical grease
06:07 deshipu should be fine, of course, do some testing :)
06:07 deshipu there are also water-tight ball bearings
06:07 Jck_true Concept phase still :)
06:15 Jck_true Inspecting sailboats under the water line. An acrylic tube with a GoPro - and strong led's + battery. Attach it to sink rope. And let it ride along the rope to the other side....
06:18 deshipu wouldn't it be easier to just have it affixed to the rope?
06:18 deshipu and just move the rope?
06:18 Jck_true It has to have some clearence to the boat...
06:18 Jck_true Oh wait
06:20 Jck_true Ehh the only thing that pops into my mind is that I want to maintain a pretty constant speed
06:20 Jck_true Since I won't be getting a live video feed back up I want to be sure the video is not too jerky
06:20 Jck_true (The water here means you can barely see 50cm )
06:20 veverak you can stabilize it with postmodification I suppose
06:21 veverak Jck_true: anyway, explore submarines technology
06:21 veverak RC Models of submarines could help you a lot
06:21 veverak :)
06:21 veverak also, scubadiving technology oculd help a lot
06:21 Jck_true veverak: That all quickly gets expensive :)
06:22 veverak I don't said use it
06:22 veverak :)
06:22 veverak there should be DIY way to make something water-tight
06:22 Jck_true I could just have a kid - Once he gets 5 years old attach a lead belt around his waist and throw him in
06:22 Jck_true Tell him to unbuckle when he starts to get dizzy
06:23 deshipu buy some from China, it's cheaper
06:23 veverak anyway
06:23 veverak as far as I know RC hobbyist tends to have forums
06:23 veverak you usualy find there some known ways how to do this your own way
06:23 deshipu that they do
06:23 veverak and cheap propably
06:23 veverak :)
06:23 Jck_true Thanks for the help guys :)
06:24 deshipu Jck_true: I recently experimented with putting magnets on the legs of my walking robot
06:24 deshipu Jck_true: to let it walk on vertical metal surfaces
06:24 deshipu Jck_true: it's a spider-shaped quadruped
06:25 verak must resist with another pro
06:25 veverak always wanted submarine
06:25 veverak damn you!
06:25 deshipu Jck_true: I'm sure it would be perfect for this use case
06:25 deshipu you would just seal it in a plasic bag with the air sucked out
06:26 deshipu veverak: communication is the hard part, cables are heavy
06:27 veverak that's just question of radio being strong enough?
06:27 veverak ok, I won't have live camera feed propably :/
06:29 deshipu low freq radio would probably work
06:29 deshipu but that's slow
06:29 veverak I know
06:29 deshipu forget about 2.4Ghz
06:29 Jck_true I'm not looking for a live feed either. I just need to inspect the keel for any serious damages
06:30 Jck_true Actually...I could make it like a diving bell...
06:30 Jck_true Easy access on the opposite side...
06:31 Jck_true And the air in the container keeps it upright
12:02 deshipu https://cdn.hackaday.io/images/4487021447781391452.jpg
12:03 veverak cool
13:44 blib where is a good place to buy tires?
13:45 akem germany
13:45 blib akem: I meant online in the USA
13:45 blib Looking for 8" tires that will take weight, and have good friction
13:46 akem ha i dont know then blib
13:46 blib akem: where in germany do you buy?
13:52 robotust1a tires for robot?
13:53 robopal you just look for a device that has similar tires/wheels for your app and nique those
13:53 blib robopal: I'm looking for a 8" - and need to attach to my current motors
13:53 blib do you know what load range A B C mean?
13:54 robopal oops I hope you don't speak french because nique means something else, I was confused :P
13:54 robopal -sorry-
13:56 deshipu http://www.aliexpress.com/wholesale?shipCountry=CH&shipFromCountry=&shipCompanies=&SearchText=robot+wheel&exception=&minPrice=&maxPrice=&minQuantity=&maxQuantity=&isFreeShip=y&isFavorite=n&isRtl=n&isOnSale=n&isBigSale=n&similar_style=n&similar_style_id=&CatId=0&g=y&SortType=price_asc&initiative_id=SB_20151117112835&needQuery=n&groupsort=1
13:56 deshipu wheeels \o/
13:57 robopal 8" are a little large, lawmower size I think?
14:00 robopal oh boy lots of plastic gears in sets I see in the same category there...
14:01 robopal a lot has changed in the last 10 years... they now can send you anything with free shipping
14:02 robopal a 10c pin, sure, we will deliver, free international shipping!
14:02 robopal jesus
14:04 robotust1a I used standard 10" wheels :)
15:05 anonnumberanon my robot can now stand
15:06 anonnumberanon and I can now go to bed
15:13 deshipu good night
15:14 anonnumberanon ah btw nice website deshipu
15:15 deshipu anonnumberanon: which one?
15:15 anonnumberanon i forgot it was last week i saw it and someone said u made it for them?
15:16 deshipu anonnumberanon: weird, it was years since I made a website
15:16 deshipu like, 10 years
15:17 anonnumberanon i should go and check my logs to see what it was
15:17 anonnumberanon may have been someone else
15:18 deshipu nah, it's not that important
15:18 deshipu sweet dreams
15:20 anonnumberanon thanks
19:46 rue_more armyofevilrobots, how areyou guys doing?
19:46 rue_more want some chicken soup?
19:47 rue_more I have stock of the extra salty stuff, good for when your ill.
19:58 armyofevilrobots Heh, I think she’s a little better.
19:58 armyofevilrobots Come on by whenever.
19:59 armyofevilrobots I just loaded up a half-sheet of MDF that had a couple of other things cut from it. I have some scrap pieces that we can just cut a ton out of.
19:59 armyofevilrobots I am heading back to the shop...
20:12 rue_more ok b over as soon as I find your driveway!