#robotics Logs

Jan 16 2012

00:29 zhanx_ hit a monster fish today
00:30 rue_house with your boot? did you kill it?
00:30 zhanx_ folded my 60 pound pole like a twig
00:30 zhanx_ no it broke my 65 test line
00:30 zhanx_ line is like rope
00:31 zhanx_ i was out fishing in the cod
00:31 zhanx_ cold
00:32 rue_house what? 65 lb?
00:33 rue_house 65lb line is tiny?
00:33 zhanx_ fish was about 35 pounds easy to snap the line
00:33 zhanx_ huge
00:33 rue_house yes...
00:34 zhanx_ brown trout are running etc
00:35 rue_house to or from the water?
00:35 zhanx_ from the lakes
01:53 rue_bed heh, the boilers draft fan has 8 speeds, 0 is stop and 3 and 4 are the same
01:53 rue_bed pls remind me to take pics of that tommorow
01:54 rue_bed I didn't do a good job of getting better this weekend
01:54 rue_bed I think my cold is worse
01:55 pigpenguin hey so im trying to work out the force needed to push a bot with locked wheels. How ever there are multiple wheels on it... would I just calculate using the wheels with the largest coefficient of friction?
01:56 rue_bed locked?
01:56 rue_bed that approach sounds good to me
01:56 theBear pigpenguin, as in push it when it doesn't want to move ? gets complicated, like writing a rally-car-game... once the friction is broken, things tend to move a lot easier, like how a car has GREAT grip, until you spin the wheels, then a child (with a very irresponsible parent) can push the thing sideways while getting rubber smoke poisioning
01:57 rue_bed if you want real numbers, get a guage and go drag it around
01:57 rue_bed concrete has about the highest normal friction co-eff
02:02 pigpenguin thanks, and i will be draging it around, its not built yet though so I am just trying to get some ball park numbers for now
02:07 theBear i always found the "burnout in a car" analogy made the most sense to me for that friction stuff
02:08 theBear once you break that initial 'stick' it takes very little to keep moving
02:10 pigpenguin yeah I just was not sure how to go about calculating when you have multiple points of contact with differenct coefficients of friction
02:14 theBear mmm... me too, tho i'd guess for any 'moment' it's a basic averaging thing, maybe taking into account weight distribution too
02:31 pigpenguin dont you love it when you ask a seemingly easy question and you discover the answer is not so easy
02:35 theBear heh, it happens less with experience <grin>
02:36 theBear but i mean, friction and whatever they call that 'breaking it' point (when the tyres start spinning and the 'friction goes away') are pretty complex as far as maths concepts go
02:43 pigpenguin yeah, this is the first time I have ever tried to show using math and physics that a certain wheel config is better i have always sorta winged it :P
02:46 theBear me too :)
02:50 pigpenguin oh would you look at the time, I really should get some sleep
02:50 pigpenguin bye
02:53 theBear heh, and i really should go visit the psych ward after a quick shower... bye
13:14 pigpenguin any one on here doing first robotics?
13:21 pigpenguin i guess thats a no
13:32 Wulong You should assume there is.
14:12 pigpenguin just quiet then?
14:38 theBear busy,
14:38 theBear oh, he gone
14:38 theBear i was gonna elaborate :)
15:38 pigpenguin dont you love it when you pick numbers cause they feel right and they work first try
16:18 pigpenguin any body doing anything interesting
17:32 zhanx i think my computer hates me
18:02 pigpenguin why does your computer hate you?
18:03 pigpenguin as in what is it doing not what you did to upset it
18:08 zhanx i am ignoring it too much
19:15 pigpenguin this chat is so quiet
20:07 rue_house hi
20:31 zhanx hi