#robotics Logs

Jun 19 2014

01:10 rue_more i-make-robots, dan?
01:11 orlock Triffid_Hunter: Ever bought anything from hackvana?
01:27 orlock coldest day of the year so far
01:27 orlock and heres me thinking i might go and do some work in the shed
03:43 Tom_itx orlock, i've had good luck with his boards
14:38 julby0 I have a toy robot arm. I want to know how the arm maintains position when no power is supplied to the motors. They are not stepper motors. I took it apart, and there's a motor in a case with a bunch of gears. I can't easily turn the gear by hand, it only turns in any direction when power is supplied. how is this accomplished? Sorry if this is not a good explanation
14:53 Hyratel it is a good question.
14:55 julby0 someone in #electronics said it's a "gearhead motor" so i'm googling that now
14:58 julby0 okay, so maybe it's because you can drive a "regular" gear with a worm gear but not vice versa?
14:58 Hyratel yep
14:58 Hyratel worm gears cannot be backdriven
14:58 julby0 that is pretty damn cool
14:58 julby0 thanks
18:42 Guest26146 rue_bed: hardware store grab bags are fun.. you get to play with faulty screws! http://gushh.net/tmp/dscn5661f.jpg (notice the faulty one?) there's actually two like that (the other is unthreaded just a round shaft)
18:42 Guest26146 I should complain to get my $1 back!
20:26 JEntrep I'm back :)
20:41 orlock Woo, dx.com order arrived
20:42 MjrTom yay
20:42 orlock lockpicks, socket adaptors, pelter, a few assorted motor drivers, 433Mhz transceiver set, little square old nokia lcd, ultrasonic sensor
20:43 DagoRed nice orlock
21:03 rue_more wow, so new they come with shavings
21:06 rue_more you can backdrive a worm gear if its cut right
21:06 Hyratel yeah, if it's steep enough thread pitch
21:06 Hyratel most are too shallow to do so though
21:08 rue_more sometimes in the boxes of x00 screws I get there are a few blanks
21:09 orlock my old pair of boots, a small bolt must have gotten compacted into the mould
21:09 orlock threre was a rubber head and half the screw sticking out of the grip on the sole
21:09 Hyratel O_o
21:10 Hyratel thats freaky
21:10 orlock like, it wasnt the bolt
21:10 orlock it was a rubber impression
21:10 Hyratel it was a positive impressuin of the bolt?
21:10 orlock sticking out of the sole like the rest of the bits of tread
21:10 Hyratel so yes
21:10 orlock yeah
21:11 orlock so must have been stick to the master they made the negative from
21:12 orlock oh, also a small air pump (for the pond)
21:38 mribeirodantas Has anyone ever used anything from radish repositories?
21:44 orlock I bought some bidirection level convertors too
21:44 orlock 3.3 to 5v
22:54 MrCurious robo-phobes piss me off
23:21 password2 lol
23:25 password2 build a bot that pisses on em