#garfield Logs

Mar 29 2015

00:03 rue_shop3 if a wood chuck...
00:03 rue_shop3 no
00:03 katsmeow-afk maybe
00:04 katsmeow-afk no one has talked to me in here in 24 hrs
00:04 rue_shop3 the question is, how fast (max) would you figure that a human muscle can retract. inches/sec I suppose
00:04 katsmeow-afk pretty damned low, actually
00:05 katsmeow-afk most human muscles contract only aninch, some like arms, contract maybe 2 inches, upper legs might contract 3 inches
00:05 rue_shop3 indeed
00:05 rue_shop3 so what rate can they do it
00:05 rue_shop3 muscles dont have much leverage
00:05 katsmeow-afk so how fast can you contact and release your stomach? once per sec? that's one inch per second
00:05 rue_shop3 a second is a long time
00:05 rue_shop3 I can do a lot of things
00:06 rue_shop3 usually ending in being borred
00:06 rue_shop3 cant count the number of times i'v stated "well the end of that second was borring"
00:06 katsmeow-afk your elbow can do 90 degrees back and forth (counts as one movement) 3x per sec? that's only an inch of muscle contactions, so 3x = 3 inches per sec
00:06 rue_shop3 course, I cant tell anyone, cause when I talk that fast they just say "what?"
00:07 rue_shop3 ok
00:07 rue_shop3 so, my forearm is about ...
00:07 e_shop3 disconnects i
00:08 rue_shop3 hmm, depending on where you draw the line, about 10 or 11 inches
00:08 rue_shop3 so were at a 1:10 disadvantage on it too
00:08 katsmeow-afk the leverage an extended arm has on the shoulder is astonishing
00:09 rue_shop3 ok 3 inches/sec, thats pretty slow really
00:09 rue_shop3 the position control loop must be really tight
00:09 katsmeow-afk that means no slop in bearings or gears, and pretensioned ropes/cables
00:10 katsmeow-afk i strongly suggest tapered roller bearings, they are cheap enough if you call them "small trailer wheel bearings"
00:11 katsmeow-afk good for 1000lbs, and you adjust the nut on the shaft to remove bearing slop
00:12 e_shop3 fails to pick up his cup of tea twice before realizing he will have to put his arm bac
00:13 rue_shop3 interesting comment, the air muscles prettymuch require pretensioning
00:13 katsmeow-afk i say fill them with liquid, not air
00:14 rue_shop3 liquid moves too slow
00:14 rue_shop3 I'm really set on air
00:14 katsmeow-afk not at 10,000 psi
00:14 rue_shop3 no, air muscles only need about 20psi
00:14 rue_shop3 meaning a tank charged to 100psi will go a long way
00:15 katsmeow-afk right, but you can still move the liquid at high pressure, as needed
00:15 katsmeow-afk i bet it won't,, i thought a 1 hp air compressor was enough for diving near the surface, it isn't
00:15 rue_shop3 hard to deal with high pressure, and expensive
00:15 rue_shop3 its a $240 project
00:16 rue_shop3 I have two AC compressors for cars
00:16 rue_shop3 unfortunatly they dont ahve the same type of damn PULLEY
00:16 rue_shop3 but however
00:19 rue_shop3 I am also looking for the compliance I get from air
00:19 rue_shop3 I'll make sure the frame shunts impact to the muscles and let the air take it up
00:20 rue_shop3 ok I made 12 of the flush-burried yard lights today, got one installed, looks good
00:20 tsmeow-afk wonders if rue has seen any videos when someone uses a bungie cord to launch squir
00:21 rue_shop3 oh daer
00:21 rue_shop3 I like squirrels
00:21 rue_shop3 poor little rodents
00:21 katsmeow-afk bungie cords are compliant, so are your muscles
00:21 katsmeow-afk wanna see how that's bad?
00:21 rue_shop3 heh, I cant even make a stable power supply :(
00:21 rue_shop3 :)
00:22 katsmeow-afk cord to car battery, your elbow near your waist, cord in hand, lift battery clear of floor, hold steady, close your eyes, someone else without warning cuts the cord
00:24 rue_shop3 this dosn't sound different from: rue pulls on stuck wire, wire comes loose, rue punches self in face
00:24 katsmeow-afk or do the same with your air muscle
00:24 katsmeow-afk right
00:25 rue_shop3 and once again rue makes note to check vectors before pulling on stuck things
00:25 rue_shop3 ok I can stay up all night, which project should I work on
00:25 rue_shop3 I dont want to code
00:25 katsmeow-afk your mecha with the soft muscles will do the same thing, uncontrolled violent movements, possibly damaging itself or environment
00:26 rue_shop3 I'm determined to try it
00:26 katsmeow-afk ok
00:27 rue_shop3 I dont want to work on a new cnc till I have a cam solution that dos't involve a windows computer
00:29 rue_shop3 my yard lights are 25mW ea
00:29 rue_shop3 I recon that if I have 32 of them, the 7.2Ah battery will last 9 hours
00:30 rue_shop3 (to 80%)
00:30 katsmeow-afk i have a bearing seat (3/4 inch length of pipe) i need to weld an arm to it, welding changes the ID and the roundness of the bearing seat, which i cannot fix,, what do i do?
00:30 rue_shop3 ifny, you alive over there?
00:30 e_shop3 taps on ifny, mar
00:31 rue_shop3 hmm
00:31 rue_shop3 katsmeow-afk, can you estimate how far it will be out when your done, undersize and ream it?
00:32 katsmeow-afk i don't have, cannot afford, a 1.25 reamer
00:32 rue_shop3 your the queen of jigs my dear
00:32 katsmeow-afk plus, clamping the seat to put that much torque onit, warps it
00:32 rue_shop3 how about grinding it
00:32 rue_shop3 precision stuff is ground to size
00:32 katsmeow-afk cannot get inside it with any but a dremel
00:32 e_shop3
00:33 rue_shop3 I know someone who used a grinder to make some great circles
00:33 katsmeow-afk outside, sure
00:33 katsmeow-afk or big enough ID
00:33 rue_shop3 grinder, dremel
00:33 rue_shop3 what does a jig care
00:34 rue_shop3 ?
00:34 rue_shop3 how do I make a jig to grind .1" off the inside of a 1.25" hole?
00:35 katsmeow-afk .1? that'sa lot
00:35 rue_shop3 using a .5" grinding wheel
00:35 rue_shop3 maybe a set-and-forget automated jig
00:36 rue_shop3 maybe in a few passes, to compensate for stone loss
00:36 rue_shop3 check it after every pass
00:36 rue_shop3 adjust and restart
00:36 rue_shop3 it would need to move the dremel in a cirlce somehow
00:36 katsmeow-afk yea,, it's going to be slow with a grinding stone
00:36 rue_shop3 and not twist up the cord
00:37 katsmeow-afk or rotate the seat
00:37 rue_shop3 oooh
00:37 rue_shop3 that would radically simplify if
00:37 rue_shop3 it
00:37 rue_shop3 then it just needs a distance limted depth mechanism
00:38 rue_shop3 maybe like a windshield wiper motor
00:38 rue_shop3 once it gets to full depth, it comes back
00:38 rue_shop3 ..but much slower
00:38 rue_shop3 if the time is known of a cycle, a person can do other things till its done a cycle
00:38 rue_shop3 adjust and restart it
00:39 katsmeow-afk i cannot see it being an accurate hole, the grinding stone will never be perfectly even from end to end
00:39 rue_shop3 no, but as the stone wears down the peice will be getting to size
00:40 rue_shop3 each pass takes less off both
00:40 rue_shop3 at some point the target size is hit
00:40 katsmeow-afk on the genny disks and the lathe holes, i minimised that some by using the OD of the stone as much as possible, but the holes in the headstocks to hold the lathe bearings are not adequate
00:41 katsmeow-afk good thing i been collecting windshiled motors :-/
00:41 katsmeow-afk i need a mill to make a new sign : {CAJ} -- Custom Automated Jigs
00:43 rue_shop3 I'm sure it can be done with motors and cams
00:43 rue_shop3 programmable cams are sweeeet
00:43 katsmeow-afk last yr, i considered making a jig that mounted to the headstock and thru the bearing seats, and held a lathe cutting tip, it will take alot of time to set up, and be slow, and needs to be automated, but shold be lots more accurate
00:43 rue_shop3 I saw a great one on an old boiler at the hospital
00:44 rue_shop3 did I tell you I worked out how to make the knee/elbow joints of the mech without having to drill any large pin holes?
00:45 katsmeow-afk clampons? clamshell holders?
00:45 katsmeow-afk universal bearing clamps?
00:45 katsmeow-afk you used me pipe idea?
00:46 katsmeow-afk you used cheaper pipes and fileld them with epoxy?
00:47 katsmeow-afk i once replaced the rotor bearing in a circular saw motor by pressing a ball beaing on the shaft, then centering the rotor in the stator, grinding out the dead sleeve bearing, pouring the hole with epoxy, and then assembling it
00:48 katsmeow-afk epoxy hardened witht he rotor holding the bearing in place
00:48 katsmeow-afk worked like a charm
00:48 katsmeow-afk why it worked is there's no lateral thrust on the epoxy
00:48 katsmeow-afk only the weight of the rotor end itself
00:52 katsmeow-afk i guess you quit talking to me for another 24 hours
00:55 rue_shop3 no
00:55 rue_shop3 I'm back and forth
00:55 rue_shop3 was checking supper
00:55 rue_shop3 by the time its done, there will be none left
00:55 katsmeow-afk http://www.ebay.com/itm/Electric-Solenoid-Valve-Magnetic-N-C-DC-24V-New-Water-Air-Inlet-Flow-Switch-1-2/251775467278 -- $2.19 free s&h
00:55 rue_shop3 its a pin bearing, I have it made like a hinge with sections of pipe as the pin casings
00:56 rue_shop3 I got 10 of them
00:56 rue_shop3 remember?
00:56 rue_shop3 they were all banged up, but ok
00:56 rue_shop3 bit expensive by the time it was done, about $3 ea
00:56 rue_shop3 10 is enough to make 2.x air muscles
00:57 rue_shop3 well, if I use them for returns its good for 5
00:57 katsmeow-afk i didn't think you bought any selenoids, you were scavenging free washer valves
00:57 rue_shop3 having a problem with the local recycling program which dosn't allow any reuse
00:58 katsmeow-afk o
01:13 katsmeow-afk see, if i use 2 sheets of 8ft long steel to make pontoons,
01:14 katsmeow-afk using 2 sheets to make 2 pontoons gives me 2.5ft dia pontoons, and two of them float 600 lbs
01:14 katsmeow-afk using 2 sheets to make 1 pontoons gives me a 5ft dia pontoon, and it will float 1200 lbs
01:15 katsmeow-afk but i cannot carry two 5ft pontoons down the highway
01:17 katsmeow-afk i can carry two 3ft dia toons down the road, make them of 10ft plate instead of 8ft, and two of them will float 950lbs
01:17 katsmeow-afk all floats are per foot
01:17 rue_shop3 hmm
01:17 rue_shop3 the old tanks were 24"
01:17 rue_shop3 ?
01:19 rue_shop3 root@blackie2:/tmp# circle -c 8
01:19 rue_shop3 Radius is : 1.273239
01:19 rue_shop3 Diameter is: 2.546479
01:19 rue_shop3 Circumfrence is : 8.000000
01:19 rue_shop3 Area is : 5.092958
01:19 rue_shop3 Sphere area: 20.371832
01:19 rue_shop3 Sphere volume: 8.646073
01:19 rue_shop3 I seee
01:19 katsmeow-afk on the boat i actually launched and floated on? 16 inch
01:19 rue_shop3 4' long?
01:20 katsmeow-afk i used water heater tanks, i didn't make them from plate
01:20 rue_shop3 root@blackie2:/tmp# calc 5.093*4
01:20 rue_shop3 5.093*4 -->> 20.372
01:21 rue_shop3 root@blackie2:/tmp# units 20.37feet3 liters
01:21 rue_shop3 * 576.81417
01:21 rue_shop3 577kg
01:21 rue_shop3 1272lbs
01:21 rue_shop3 less what they weigh
01:21 katsmeow-afk 3 tanks = 12ft, and then i added a 4th tank shaped like a bow
01:21 rue_shop3 which I'd ballpark do be about 300lbs?
01:22 katsmeow-afk depends on the thickness, i'd be smart to use 1/8, which is ~6lbs.sq.ft
01:22 katsmeow-afk err, 5
01:22 katsmeow-afk plus framing, etc, figure 150lbs if it isn't a bulkhead
01:23 rue_shop3 k
01:24 katsmeow-afk using 1/8 thick 10ft plate to make 3ft dia toons is 50lbs/ft for plating, maybe 10 for frame
01:29 katsmeow-afk i ate 4 sleeping pills 2 hrs ago, why aren't i sleepy?
01:32 katsmeow-afk recommended dose is 1 pill
01:34 tsmeow-afk eats 2
01:59 rue_shop3 I was cutting a heatsink and it got too hot to hold
01:59 rue_shop3 ...
02:01 katsmeow-afk umm
02:01 katsmeow-afk hold it in a vise?
02:08 rue_shop3 I just found it kinda funny
02:13 rue_shop3 servo turns say, 280 degrees
02:13 rue_shop3 arm turns...
02:15 rue_shop3 130
02:17 e_shop3 adjusts the num
02:21 katsmeow-afk something disquieting about thinking you did something swooft by scoring 121 on Spider Solitaire, but when logging it, you discover you did it 11 times before
02:22 katsmeow-afk maybe that is all sleeping pills are good for: short term memory loss
02:22 katsmeow-afk they cause it
02:23 rue_shop3 hmm
02:27 katsmeow-afk my lowest logged win is 111
03:09 katsmeow-afk .
04:28 rue_shop3 I'm designing a printable robot arm
04:28 rue_shop3 same class as the ones I was making
06:22 katsmeow-afk oh
06:25 katsmeow-afk it dawned on me, while i was laying in bed and not sleeping, 3 of those 16bit sram chips could make a 48bit wide processor, quite suitable for hdd 48-bit LBA addressing
06:45 katsmeow-afk 24 330gig (8tb) drives need 43 bit words to address linearly, and 48 bit is 281tb
06:46 katsmeow-afk if i ever replace the 330's with 2tb drives, thats 72tb
13:04 rue_house instead of calcium, these organisims deposit silicon
13:04 rue_house they deposit silicon in a pattern based on their biology
13:05 rue_house as they go thru their life cycle, they deposit silicon thats doped differently
13:05 rue_house much like a dead coral reef, when they die, all thats left behind is the silicon they deposited
16:40 katsmeow-afk words not often heard "this is the last remaining snark inthe world"
16:42 katsmeow-afk apparently there's a lot of snarks on the ocean floor off Cape Canaveral
16:43 rue_shop3 WTF, I have "low esr" caps with 0.6ohms esr, I have OLD AUDIO CAPS with 0.3ohms
16:43 rue_shop3 both 100uF 16V
16:44 katsmeow-afk yeap, that's like "high voltage TL084 opamp"
16:47 katsmeow-afk or when "extreme precision" = "within 20 meters"
17:05 katsmeow-afk rue, put 15v on each cap for an hour or so, then retest each
17:06 katsmeow-afk while you are waiting on them for that hour (or so), could you jackhammer some of the *dirt* floor of my garage
17:07 katsmeow-afk in the top 5 of amazing things about Florida was sitting something heavy on the ground, and it sinking in overnight
17:08 katsmeow-afk in one week, i jacked up the rear end of that mobile home 3 times, but the whole time i was there, i never did get it upto actually level, it sank every night
17:09 katsmeow-afk and the guy i was wanting to buy from, wold not let me set larger area bases to the support columns under it, to slow/stop the sinking
17:10 katsmeow-afk the whole point of getting away from here was so i could to things outside, but slowly the rules increased so i couldn't do things outside there either
17:12 katsmeow-afk plus there was the same garbage smoke, the same qty of large "guard" dogs, the same sorta animals literally eating at the house, the same mail delivery issues, the same rules made by humans who shoudl have zero input into if i use solar panels or not, etc etc etc
17:14 katsmeow-afk the truck , with load on it, sitting still, could sink 3" the first nite parked
17:16 katsmeow-afk Rain
17:16 katsmeow-afk 100% chance of precipitation
17:17 katsmeow-afk Probability of Precipitation (%):
17:17 katsmeow-afk 0% 0% 0% 0% 0% 0% 0%
17:17 katsmeow-afk i guess someone will be delivering the rain manually
18:38 rue_house hahah
22:14 rue_house how can I capacitivly couple to water and have only a DC current thru the water
22:17 rue_house http://i543.photobucket.com/albums/gg471/bobc0/bikebits/harmmk2.jpg
22:17 rue_house its a harmonic drive, less the flexed metal