#robotics Logs
May 24 2018
#robotics Calendar
09:43 AM rue_mohr: morning
09:46 AM z64555: it is, i think
09:46 AM * z64555 looks outside the window
09:46 AM z64555: yes
09:48 AM z64555: this channel needs more robots being built -_-
09:49 AM rue_mohr: how about a 3d printer?
09:50 AM rue_mohr: I have the screw sorter
09:50 AM rue_mohr: and I want to make a holding robot
09:50 AM rue_mohr: ... heh robot of holding
09:51 AM rue_mohr: I suppose I could just make big ass servos and have them hold a constatnt positoion, then inject error to actually make it move
09:52 AM rue_mohr: start with a good tripod
09:54 AM rue_mohr: https://www.outsidepursuits.com/wp-content/uploads/2017/03/Best-Bike-Repair-Stand.jpg
09:55 AM rue_mohr: not sure where to just find one of those
09:55 AM rue_mohr: to build one...
09:55 AM rue_mohr: need a post, and a pipe that can slide over it
09:55 AM rue_mohr: with a lock screw
09:56 AM rue_mohr: some bits of square tubing to weld to it to make the hinge point for the leg attachments
09:56 AM rue_mohr: legs are just pipe and the straps are just strip
09:57 AM rue_mohr: ok, then I need a good joint for an arm ontop of it
09:57 AM rue_mohr: so, should the motors be on-joint or down at the base where the weight is needed
09:58 AM rue_mohr: electric over hydraulic maybe
09:59 AM rue_mohr: then I could use threaded rod actuators at the base
09:59 AM rue_mohr: tho I'd need hydraulic cylinders
10:00 AM rue_mohr: about 6 or more
10:01 AM z64555: wonder if I could make something pneumatic, I've got an air compressor in the barn that's been itching for action
10:01 AM rue_mohr: valves are the challange
10:01 AM rue_mohr: esp if you need a lot of them
10:02 AM z64555: solenoid valves too expensive?
10:02 AM rue_mohr: depends if you want proportional vaves
10:03 AM z64555: hm
10:03 AM rue_mohr: I'd use air-muscles for this, but I need all the valves I'v been collecting for my large robot
10:07 AM rue_mohr: hydraulic cylinders are available for just under $!00 ea
10:07 AM rue_mohr: $100
10:22 AM rue_mohr: oh, or I just use the 400kg electric rams I have
10:22 AM rue_mohr: NARF
10:22 AM rue_mohr: 4000N ;)
10:23 AM rue_mohr: kinda slow tho
10:23 AM rue_mohr: wait, what voltage are these TDA2050 rated for...
10:23 AM rue_mohr: 50V
11:38 AM weyland|yutani: rue_mohr, careful with hydros that stuff is nasty if its injected under your skin
01:36 PM sparrowsword_: how to calculate how much a drone can lift? or a particular motor
01:37 PM Tom_L: lots of variables
01:37 PM sparrowsword_: Tom_L: the end result i am looking for is 75lbs
01:37 PM Tom_L: motor hp, prop diameter, pitch, air density......
01:38 PM Tom_L: i dare say it won't lift anything in a vacuum
01:38 PM sparrowsword_: Tom_L: well i breathe air...and this is where the drone will dwell...so
01:38 PM Tom_L: 15k ft or sea level?
01:38 PM Tom_L: makes a difference
01:39 PM sparrowsword_: Tom_L: however, i do find that the pitch of the prop? is interesting
01:39 PM sparrowsword_: 500ft above sealvl
01:40 PM sparrowsword_: Tom_L: ideally 900ft
01:40 PM Tom_L: http://www.epi-eng.com/propeller_technology/selecting_a_propeller.htm
01:40 PM Tom_L: you gonna deliver for Amazon?
01:41 PM veverak: awell
01:41 PM veverak: repaired exams for students on uni
01:41 PM veverak: 8/23 passed
01:41 PM veverak: decent filter
01:41 PM Tom_L: students fault or teacher?
01:42 PM sparrowsword_: personal endeavor
01:42 PM Tom_L: shite bomb the neighbor?
01:42 PM sparrowsword_: Tom_L: much simpler ways of doing so
01:43 PM veverak: Tom_L: hard to tell
01:43 PM Tom_L: :D
01:43 PM veverak: I man
01:43 PM veverak: *mean
01:43 PM veverak: this is course for data structures and algorithms
01:43 PM Tom_L: veverak, they either got it or they never will
01:43 PM veverak: 3/13 weeks, the topis were graph
01:44 PM veverak: and yet most of them were not able to recognize that you want to use "BFS" for 'find shortest path to a treasure in a maze'
01:50 PM sparrowsword_: Tom_L: so probably a big prop and a low kv motor?
01:54 PM sparrowsword_: Tom_L: something like https://www.amazon.com/GARTT-ML8318-100KV-power-multicopter/dp/B00Q65D7S0/ref=sr_1_3?ie=UTF8&qid=1527185853&sr=8-3&keywords=100kv+motor
02:11 PM sparrowsword_: recommended chassis size for quadcopter with 30inch props?
02:13 PM sparrowsword_: 1200mm 60kg nvm
02:36 PM sparrowsword_: how on earth do i power this? https://www.amazon.com/GARTT-ML8318-100KV-power-multicopter/dp/B00Q65D7S0/ref=sr_1_3?ie=UTF8&qid=1527185853&sr=8-3&keywords=100kv+motor
02:44 PM Tom_L: ask tesla
02:47 PM -!- #robotics mode set to +o by tolkien.freenode.net
02:57 PM sparrowsword_: Tom_L: tesla is a myth
03:05 PM -!- #robotics mode set to +o by tolkien.freenode.net
03:08 PM davr0s: ^^^^
03:09 PM bolt is now known as Guest53877
03:09 PM Ahti is now known as Guest89688
03:09 PM LoRez is now known as Guest95798
03:12 PM Guest95798 is now known as LoRez
03:13 PM SpeedEvil: https://www.ebay.co.uk/itm/Tesla-Model-S-90D-battery-modules/123120560988
05:18 PM sparrowsword_: max thrust vs max pull? working with drones
07:41 PM z64555: did sparrow leave?
07:41 PM z64555: looks like he did
07:59 PM LuminaxWork is now known as LuminaxWk
10:01 PM LuminaxWork is now known as LuminaxWk