#robotics Logs

Sep 22 2014

00:36 MrCurious need to know how to drill a 4.5mm hole in a 10mm ball bearing
00:40 GargantuaSauce presumably still in argentina
00:41 GargantuaSauce i take it the CA isnt working out after all?
00:43 mrdata i did something like that a couple days ago, MrCurious
00:43 mrdata i drilled a 1/16" hole thru a nail
00:43 mrdata ball bearings are harder than nails, though
00:43 mrdata that may be trouble
00:45 Hyratel MrCurious, how centered does it have to be
00:45 mrdata yes, how well centered?
00:46 mrdata the hole in the nail was off centre by a few thousanths of an inch
00:46 mrdata it would have been more, but i made adjustments after starting it
00:46 Hyratel MrCurious, I'd suggest spinning the BB
00:47 mrdata hmm...
00:47 mrdata MrCurious, do you have a lathe?
00:47 MrCurious took a carbide spiral bit to it on the mill
00:48 MrCurious back and fourth while lowering.
00:48 MrCurious it "scratched it
00:48 MrCurious tried a hole punch
00:48 MrCurious the bearing laughed
00:48 MrCurious perhaps time to re-buy some with holes already in them
00:48 mrdata yep; it's harder than nails
00:49 MrCurious suspecting "hardening" is part off fthe whole ball bearing definition
00:49 mrdata not just that
00:49 mrdata they're alloys
00:49 MrCurious dont forget mirror polish
00:49 mrdata with extra hardness
00:49 mrdata mhm
00:49 MrCurious they mock me
00:49 NotWorthCr4p 1) electoablation 2) grinding 3) deharden it , drill, and then reharden it, accept a lot of distortion
00:50 mrdata i like the idea of electroablation
00:50 MrCurious 4) buy the right bearing with a hole, like for ear decoration
00:50 mrdata but what elements are there, in there?
00:50 mrdata any osmium?
00:51 MrCurious http://www.ebay.com/itm/14g-Threaded-Steel-Replacement-BALL-/230918767241?pt=Fashion_Jewelry&var=&hash=item35c3d4c289
00:53 mrdata wth. $1 go for it
00:53 MrCurious would need 12
00:54 MrCurious would prefer a bigger hole
00:54 mrdata shipping costs more
00:57 MrCurious well plan b is glue magnets to steel rods
00:57 MrCurious and pinch ball bearing between 2 magnets
00:58 mrdata what is the function of this?
01:01 MrCurious delta printer
01:03 MrCurious seems i have enough magnets. just need to get some platic washers
01:20 NotWorthCr4p if you had a choice of 3 computers to operate your robot, 1) a 1Ghz cpu , 2) ten 100Mhz cpus 3) a hundred 10Mhz cpus ,,,, and memory, power use, cost, were the same, which would you choose and why?
01:39 MrCurious and... thread the rods m6 1.0
01:39 MrCurious then use a pair of nits
01:39 MrCurious nuts
01:39 MrCurious then attach magnets
01:39 orlock BUT HOW DO THEY WORK?
01:41 MrCurious and now i am pleased
01:41 MrCurious small errors in rod length can easily be adjusted for
01:55 MrCurious and teflon washers ordered
01:56 MrCurious downside... 2 to 3 more weeks waiting on ebay deliveries
02:15 MrCurious when you remember you bought a mini drafting table with lockable compas, marking a 120degree angle suddenly becomes vrazy easy
02:19 MrCurious i think tomorrow i need to make a 120 deg aluminum template, then make it into a perfect 120 degree triangle
03:50 theBear rue_mohr-afk, i dunno, he's not here
06:53 anonnumberanon Man what framework to pick for website for a senior design project in EE? to put on top of my server
06:53 anonnumberanon , it's for my team to get together and share out work with pictures and videos and of course a lot of files and also to show as a portfolio for potential employers?
20:22 Loshki NotWorthCr4p: probably (2). Maybe (3). Ultimately, more parallelism will allow you to do more, assuming you have the wits to make use of it.
20:23 NotWorthCr4p more will cut down on the task-switching going on, for sure, and potentially make interrupt responce faster
20:23 Loshki Er, is this a homework question?
20:23 NotWorthCr4p no
20:25 Loshki The trouble with (3) is although you have lots of parallelism, your fastest individual unit is a 10Mhz processor. I'd be worried it's not fast enough. Some tasks need real-time response, and can't easily be paralellised (is that a word?)
20:25 NotWorthCr4p true, on the other hand you can connect more sensors to cpus that are dedicated to that sensor
20:27 Loshki Dunno if it's worth taking a hypothetical much further. Really depends on the requirements...
20:27 tWorthCr4p looks at the reels of chips to let them know they been called hypothet
20:30 Loshki Interesting. Any ideas on how you'd program such a beast to make good use of 100 processors?
20:30 NotWorthCr4p it's more a matter of using 74HC parts vs 74ABT parts,, designing for speed vs power use
20:30 NotWorthCr4p no
20:30 NotWorthCr4p cept as byte-wide reconfigurables
20:31 NotWorthCr4p 4-byte-wide for this, 6-byte-wide for that, etc
20:33 rue_bed and yet someone decided to make the uln2003 7 bits
20:33 rue_bed why.
20:33 rue_bed why 7
20:33 rue_bed what nitwitt picked 7
20:33 rue_bed its not 4, its not 8, its 7
20:33 NotWorthCr4p 7-seg driver?
20:33 rue_bed ....
20:33 rue_bed no dp?
20:33 tWorthCr4p does not speak for hu
20:34 rue_bed it just baffles me
20:34 rue_bed so I buy uln2803
20:34 NotWorthCr4p humans baffle me also
20:35 rue_bed I needed an aux battery case for a ups, it occurs to me that I have one somewhere
20:35 Loshki Well, I'm not much cop at hardware (I had to look up byte-wide reconfigurables), but designing a robot from the processors upwards seems ass-backwards to me.
20:35 rue_bed so, now only one mystery remains
20:35 NotWorthCr4p umm, i wasn't designing the robot, i was working at the information processing to make it smarter
20:37 rue_bed TELunus, working?
20:38 TELunus ?
20:39 tWorthCr4p frisbees a pizza into the nuk
20:40 Loshki NotWorthCr4p: I would think better *software* makes robots smarter.
20:41 Loshki NotWorthCr4p: Actually, I don't want to have that argument. Of course you need *both* hardware and software.
20:45 NotWorthCr4p i mostly agree
20:46 NotWorthCr4p i think the best solution is a mix
20:46 NotWorthCr4p when rue goes to sleep, he still has enough cpu running so a loud horn will cause him to become alert again
20:47 NotWorthCr4p and, such a low-power process can be run on the slowest and least power-hungry cpu
20:48 NotWorthCr4p while a faster cpu can find a place to put one's foot or paw, a smaller processor can detect if it's been pierced by a nail
20:49 NotWorthCr4p a slow processor can determing if you own a cow, a faster cpu can determine the ramifications of it playing in traffic
20:51 NotWorthCr4p electrical power on an autonomous robot is precious, it's not like diesel fuel
20:54 NotWorthCr4p omd, someone named their boat "Yuzhnomorsk"
20:56 Loshki NotWorthCr4p: seems to me you've just made a case for a mix of slow and fast processors, since IRL memory use, power, cost, really do vary and matter to some people passionately.
20:56 tWorthCr4p
21:53 e_bed stret
21:53 rue_bed *oops
23:11 rue_mohr hmm, I'm still kinda stunned with the success of the pwm genorator
23:12 rue_mohr I suppose I was working on an eprom programmer just before that
23:25 anonnumberanon It works that well ehh?
23:26 NotWorthCr4p yep, but i am still not worth a damn
23:27 anonnumberanon are you a bot?
23:27 NotWorthCr4p no :-(
23:27 anonnumberanon Why do you say that?
23:29 NotWorthCr4p there's an outside chance we could make some money, but rue would rather jerk me around with it and teach me a further lesson in trusting/believing in anyone or anything
23:30 NotWorthCr4p he is going to pass it up because it's me involved
23:31 NotWorthCr4p i should have learned after being ripped off on the move to Fla a few yrs ago, but rue is nailing the lesson home now
23:39 rue_mohr you did not say yes or no to doing it when I asked you
23:40 rue_mohr I assumed no
23:40 rue_mohr I had it pegged to sit down when I had time and register
23:40 NotWorthCr4p i was practically begging you before
23:40 rue_mohr yea, when I was out of time to do it
23:40 NotWorthCr4p yu said you'd do it tonite, then you said you were going to eat and go to bed for the nite
23:40 rue_mohr and I'm out of time now
23:41 rue_mohr I only want to do things if I have time to finish them
23:41 rue_mohr I spend all day at work half finishing everything and it pisses me off
23:41 rue_mohr all day, getting things started just to have them trumped by something so that they become ANOTHER loose end
23:42 rue_mohr and at the end of the day, all I hsave to show for an exhausting day is ANOTHER 12 loose ends
23:42 rue_mohr till I'm literally drowning in them and people are pissed off for what I havn't got done
23:42 rue_mohr if I dont have time to finish it, I dont want to start it
23:44 NotWorthCr4p there's 8 more days to get it in, i bet you will never do it
23:45 rue_mohr how about tommorow at 5pm when i get home if I'm not so exhausted I need to sleep or after nap if I do?
23:45 NotWorthCr4p it would pay off your mortgage, i have the parts, you will never do the paperwork, it sucks
23:45 rue_mohr given my history I have 0 faith in winning competitions
23:45 NotWorthCr4p it sucks humans say thing will get better if i try, but me trying is irrelavant
23:57 NotWorthCr4p instead of working to make something, i'll just go get drunk and beat my head against the floor and watch braindead crap on tv, THAT's more socially acceptable
23:58 NotWorthCr4p glad the pwn works so well for you