#garfield Logs

Jan 04 2015

00:21 Tom_itx friggin keyboard just quit
00:22 katsmeow-afk how did you type that?
00:22 Tom_itx other pc
00:22 katsmeow-afk o
00:22 Tom_itx seems a reboot woke it up
00:23 Tom_itx or maybe not
00:23 katsmeow-afk maybe it's simply partly unplugged?
00:23 Tom_itx checked already
00:47 katsmeow-afk fwiw, and fyi, and some other accronmyms : allelectronics.com alltronics.com
00:47 katsmeow-afk (crossposting)
01:03 katsmeow-afk not sure if the rum&coke is a sleep aid, but i sure feel like i had a rum&coke
01:04 katsmeow-afk when i woke this morning, i felt like i had just done a hard day of physical work
01:04 katsmeow-afk luckily, my fears of it being caused by the flu are now unsupported
01:55 tsmeow-afk decides "Robot Wars" (1993) isn't much about ro
01:56 katsmeow-afk it has a huge 6-legged tour bus
04:18 rue_bed I'm still not sure how I want to do single axis joints like elbow
04:18 rue_bed s
04:21 katsmeow-afk cannot sleep
04:21 rue_bed I suppose a 12' mecha could just use 1/4" plate on joints like that
04:21 rue_bed how strong do you think a CV is?
04:22 katsmeow-afk CV won't turn far enough to be a elbow
04:22 rue_bed prolly take a few hundred footpounts toque eh?
04:22 rue_bed no I was getting distracted
04:22 rue_bed oh they dont do 180 do they
04:22 rue_bed hmmm
04:22 rue_bed they only handle abotu 20 or 30 degrees
04:23 tsmeow-afk
04:23 rue_bed I'v never played with one
04:23 rue_bed I need to go to the auto wrecker and spend a gift certificate
04:24 katsmeow-afk will they let you play with it there for free?
04:24 katsmeow-afk the recycler i goto charges only for stuff i take home
04:25 rue_bed yup
04:25 rue_bed I have $100 gift certificate
04:25 rue_bed see how much I can make off with
04:26 katsmeow-afk power steering pump with remote resevoir
04:26 rue_bed I have a few hydraulic motors
04:26 rue_bed 4 iirf
04:26 rue_bed c
04:26 rue_bed and a pump iwht a 120V 1/4 horse motor on it
04:27 rue_bed iirc I have to spend it beofre may
04:27 katsmeow-afk yoo may wanna save the motors for shoulder-arm and hip-leg , and not use them as pumps
04:28 rue_bed I do not want to uuse hydraulics
04:28 rue_bed all pneumatic
04:28 rue_bed air muscles
04:28 katsmeow-afk aarrgg
04:28 katsmeow-afk air is too bouncy and not precise enough
04:28 rue_bed servo loop
04:29 rue_bed that bouncyness is the passive compliance that will keep it from breaking
04:29 rue_bed I have to make sure the joints cant lock up
04:29 katsmeow-afk try it, build a elbow with a door hinge, attach air muscles, see it jerk and flail uncontrollably
04:30 rue_bed I want to build the upper torso, it'd have been usefull a few times already
04:30 rue_bed did you not see my air muscle servo video?
04:30 rue_bed it worked great
04:30 katsmeow-afk yeas, but it was unloaded
04:31 rue_bed I have to work out how to make counteracting muscles
04:31 rue_bed I'm learning
04:31 tsmeow-afk
04:31 rue_bed there are two paramiters, they can be phrased in different ways
04:31 rue_bed one is position, the other is rigidity, which is also a damping factir
04:32 rue_bed or like an overall tension
04:32 rue_bed I havnt' built anything cause I cant work out good force sensors
04:33 rue_bed idealy, force sensors you pull on
04:33 tsmeow-afk hands rue a fiberglass rod used in powerco guylines, shows him how to put bend sensors (aka load sensors, bend guages, etc) on it, to feedback compli
04:33 rue_bed thos e little glue on sensors are a fortune
04:36 rue_bed I'vbeen unable to come up with any capacitance/inductance sensors that I like and can remeber the design of
04:36 rue_bed too bad I cant just take a peice of rubber and flood both sides with mercury and measure the capacitance
04:36 rue_bed as it stretches and gets thinner
04:37 katsmeow-afk what if yo ran a thin wire like some wirefeed stainless, anchored to one end of the rod, and run to the other end, where you attach a magnet, and then glue a 25 cent hall sensor to detect the magnet position?
04:38 rue_bed ....?
04:39 katsmeow-afk as the rod bends, the lenght of the rod on the convex side is increased, you measure that
04:39 rue_bed ihave some cheap linear halls tho
04:39 katsmeow-afk ok
04:40 rue_bed I wonder what those little laser modules could offet
04:40 rue_bed if might be possable to make a differential detector of some kind
04:40 katsmeow-afk woldn't laser cost more?
04:40 rue_bed maybe $1 ea
04:41 katsmeow-afk i have not seen $1 lasers
04:41 rue_bed ebay
04:41 rue_bed laser diode
04:43 katsmeow-afk waitng on browser.......
04:44 katsmeow-afk wowcheap
04:44 rue_bed waiting on sandman
04:44 katsmeow-afk 4:30am here, cannot sleep
04:44 katsmeow-afk bet Tom is up too
04:44 rue_bed 2:23 here
04:45 tsmeow-afk wonders what to do with 10 5mw la
04:45 rue_bed someones clock is out
04:45 katsmeow-afk ?
04:48 katsmeow-afk how fast can you modulate a KY-008 Laser Transmitter Module
04:48 rue_bed ?
04:49 katsmeow-afk http://www.ebay.com/itm/KY-008-Laser-Portable-5V-Diode-Transmitter-Sensor-Module-For-Arduino-AVR-PIC-/381034172998?pt=LH_DefaultDomain_0&hash=item58b7681246
04:52 rue_bed as a machine, I could use a transparent algee over glass eyes, they would fill in anomolies and self repari
04:53 katsmeow-afk umm, how would you control the thickness of the aglae?
04:53 rue_bed periodically wipe them
05:04 katsmeow-afk http://www.foxnews.com/health/2015/01/03/1-year-old-girl-wakes-up-during-brain-surgery-asks-doctors-hows-it-going/
05:25 katsmeow-afk speaking to someone nick "ti" about a current reading: it am 5 ma ti
05:26 katsmeow-afk reads the same both directions :-)
07:01 katsmeow-afk .
15:10 katsmeow-afk .
15:17 katsmeow-afk "NASA's Soil Moisture Active Passive (SMAP), will orbit the Earth measuring the moisture in the planet's sold to help combat the effects of drought and give aid to farmers."