#robotics Logs

Nov 19 2015

09:51 anonnumberanon hi
10:23 akem geeetech mecreator 3d printer looks cool
10:25 akem the plate is fixed, printing head moving on the 3axis, what you would expect for stability/precision, though it may not change anything in the end.
10:33 akem keukpa which one is your favorite 3d printer?
11:14 codebam so we have a new robotics club at my school and I'm helping. what should we do to start and what language should we use? python?
11:16 codebam and any other tips?
11:18 codebam I'll be here till about 12:05 and then I have to go to class. I'll be back to see responses at about 3:30pm
11:29 SpeedEvil Python is not unreasonable.
11:30 SpeedEvil https://www.youtube.com/watch?v=QPgqfnKG_T4 you may find interesting
11:30 SpeedEvil Also - timezones vary. We don't know if you meant 10 minutes, or 6 hours.
11:30 codebam oh right sorry. well that would be right now
11:31 codebam but I'll check out that video latef
11:31 codebam r
11:38 anonnumberanon codebam, robot club? so vote on which robot you think would be better and build that, start by getting a microcontroller and servos
12:41 Snert_ lotsa good fun with servos.
13:13 anonnumberanon Plus they are kind of affordable.
13:34 Keukpa akem: the UP! printer - http://website.denford.ltd.uk/machines
13:39 Snert_ cute little printer
13:40 Snert_ The UP Plus 2 is supplied with a UK power source. <--- does this mean 220V ?
13:50 akem keukpa ok i did not know, you tried reprap, kun, geeetech?
13:51 akem the ones i saw on dx, i wonder if the plate is moving on the UP
13:51 akem on the up plus 2 looks like it is
13:54 akem http://m.youtube.com/?#/watch?v=7QE7LsoFLMU
16:08 akem keukpa inmoov.fr?
16:50 anonnumberanon Man Hackaday is cancer.
16:56 adam789654123 hey anonnumberanon
16:56 anonnumberanon hi
16:56 adam789654123 :)
16:56 anonnumberanon \o/
16:57 adam789654123 still working on this threading project
16:57 adam789654123 i think im bumping up my programming skills
16:57 adam789654123 :D
17:14 akem keukpa what motors are you using for the shoulder?
18:18 Snert_ that's a good question. I been looking at motor choices for a shoulder.
18:18 Snert_ planetary gear drive seems like a good choice.
18:25 akem snert_?
18:26 Snert_ huh?
18:26 Snert_ Keukpa went away and the subject was interesting.
18:26 akem which ones? i ve look at some nema motors
18:27 Snert_ well, I've been just looking at gear mechanisms ... miniature and stuff.
18:27 Snert_ just a minute I'll get a couple links
18:27 akem other ones i have but cant test are small 5wires byj from
18:27 akem dx online
18:30 Snert_ https://catalog.precisionmicrodrives.com/order-parts/product/210-002-10mm-dc-gearmotor-20mm-type
18:30 Snert_ http://www.shayangye.com/english/products.html
18:32 Snert_ http://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20151119160749&SearchText=planetary+drive+gear+heads
18:33 Snert_ http://www.aliexpress.com/item/Free-shipping-planetary-gear-motor-stepper-motor-deceleration-planet-redection-ratio-51-8-1/32229422885.html?ws_ab_test=searchweb201556_7_79_78_77_80,searchweb201644_5,searchweb201560_9
18:34 Snert_ the problem with stepper motors is that.......
18:34 Snert_ they lose it when the power fails. the arm will just flop to the ground.
18:34 Snert_ won't hold position during power off.
18:40 Snert_ I dunno how to get around that either.
18:40 armyofevilrobots Worm gears :)
18:40 Snert_ yes...I've been seeing those too.
18:40 Snert_ I like the idea.
18:41 Snert_ 2 work drives on opposite sides of a gear.
18:41 Snert_ 1 worm motor turns one way, the other work motor turns the other way.
18:41 Snert_ both together provide enough force to position the shoulder.
18:42 Snert_ but there has to be drawbacks I don't see and understand most likely
18:43 Snert_ the arm has to hold position when the power goes out.
18:50 Snert_ it's a tough subject and I've not seen much about it :(
18:51 Snert_ I have no idea how it's handled - examples in the real world.
18:52 Snert_ put the arm on a UPS? Seems a little impractical for in the house.
18:52 Snert_ but could be done.
18:55 armyofevilrobots Why do you need two? A worm can be setup with pretty low backlash, and a single motor can drive in both directions.
18:57 Snert_ I'm not entirely sure. 2 smaller (space constraints) as opposed to 1 larger.
18:57 Snert_ I don't need to lift alot...maybe a full soda can.
18:58 Snert_ prolly less weight than that but it has to be dependable.
18:58 Snert_ and not spill the soda when the power goes out.
19:05 Snert_ and I've not found a good gripper that I like yet.
19:05 Snert_ so may have to do without that for awhile.
19:07 Snert_ so does anyone have any neato arm mechanism thingies to show?
19:07 Snert_ different motors and such
19:12 orlock https://www.youtube.com/watch?v=Slq_ag38eKc
19:13 Snert_ was there a motor in there?
19:15 orlock Snert: asking me?
19:15 Snert_ yea.
19:15 orlock No motor in there, just led;s
19:15 Snert_ I just wasnt seeing the robotics aspect is all
19:16 Snert_ I thought maybe it would rotate or something
23:50 orlock zhanx: https://www.youtube.com/watch?v=Slq_ag38eKc
23:51 orlock i got an i2c eeprom working last night
23:51 orlock now to just double check that everything works together and i can build the final board
23:52 zhanx Cool
23:53 zhanx I was up to get food