#robotics Logs

Nov 28 2011

08:55 rue_house wikipedia?
08:58 rue_house elektrinis, can you find the calcs for the ratio?
09:02 elektrinis yes
09:03 elektrinis differential does a 'power split'
09:03 elektrinis so, input = output1+output2 ?
09:03 elektrinis in terms of power
09:03 rue_house not power, not torque, look just at ratio
09:03 rue_house r a t i o
09:03 elektrinis im looking
09:04 rue_house planetary sets have 3 ratios depending on what the reference point is
09:04 elektrinis for simplicity lets say sunand ring are equal, that is a standard differential used in cars
09:05 elektrinis sun and ring
09:05 rue_house not possable to have the same number of teeth on both
09:05 rue_house I think zhanx has the formulas on hand for planetary sets
09:06 rue_house I'm eating breakfast and making a PLC just now
09:06 elektrinis :)
09:14 elektrinis btw, you _can_ have equal 'sun' and 'ring'
09:17 rue_house ratio, yes, teeth, no
09:17 rue_house oh wait
09:18 e_house thinks
09:18 rue_house no you coudn't, teeth per inch, unless you took away the planetary gears, you couldn't do that
09:27 rue_house elektrinis, http://science.howstuffworks.com/transport/engines-equipment/gear7.htm
09:28 elektrinis :)
09:28 elektrinis rue_bed, think harder
09:28 elektrinis imagine planetary gear.
09:28 elektrinis mode ring a bit to the side
09:28 elektrinis move*
09:28 elektrinis and then make it smaller.
09:29 elektrinis jour planets will shift axis, but 'ring' and sun will be equal
09:29 elektrinis 'ring' will no longer be a 'ring', it will be another sun
09:29 elektrinis but math is the same
17:59 zhanx rue is right
18:00 Tom_itx about what?
18:00 Tom_itx how are you coming on your arm project?
18:05 zhanx Tom_itx, gear ratio's and i am prepping for a rppm inspection tomorrow. about done with uart's tho
18:05 zhanx room*
18:05 zhanx next up is debouncin a few buttons
19:16 zhanx not user friendly code, wil have to comment like crazy GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
19:21 rue_house work on debouncing the butons on your kaybords
19:21 zhanx i dont have a kayboard
21:37 coppermine i thought my entire robot could run on an embedded sbc using linux at 396mhz
21:37 coppermine turns out it cant
21:38 coppermine so im adding a mini itx 2 core motherboard
21:38 coppermine to offload some of the tasks
21:38 coppermine like audio/video
21:38 coppermine what do you think?
21:44 Tom_itx i think you have rather ambitious ideas
21:46 rue_house I think you shoudl stop programming with java
21:47 rue_house zhanx_, technically I dont consider a differential a panetary gear set
23:20 Eartaker Tom_itx, u around?
23:39 zhanx_ rue_house, its not really
23:40 zhanx_ and you need to buy an l
23:40 rue_house I need an L?
23:40 zhanx_ [22:38] <rue_house> zhanx_, technically I dont consider a differential a panetary gear set
23:40 rue_house oh I do
23:41 zhanx_ is that is pan gear set :P
23:41 e_house digs through hsi scrap etters
23:41 zhanx_ hmmm
23:41 zhanx_ ok code should work for uart
23:42 zhanx_ 3 of them interrupt driven
23:42 rue_house 1etters
23:42 rue_house i can make it work
23:42 zhanx_ its arm etc so new
23:42 zhanx_ got a ton of comments to write tomorrow on it
23:42 rue_house cnc contro11er code?
23:42 zhanx_ yep
23:42 rue_house ninja comments?
23:42 zhanx_ digital readout
23:43 zhanx_ no real comments
23:43 zhanx_ its my first real gpl code being released with about 1500 followers
23:44 rue_house decided to gpl all your code from now on?
23:44 zhanx_ seems most people witht the stm32f4 discovery board are lame
23:44 zhanx_ yep
23:44 anx_ gives rue the ext
23:45 rue_house i+s ok, I found a supp1imen+ for +hat +oo!
23:45 theBear hehe
23:46 zhanx tonight was a bit of hair pulling if i had it but i am bald its good
23:46 rue_house theBear, I dont think any of hte people I'v forwarded to you have called you yet
23:47 theBear nah, and i never saw an email that i remember... i haven't been well recently
23:47 theBear picked up a TINY bit of electrical work tho
23:48 theBear also currently, my fone is largely useless
23:48 theBear yeah, umm, no ctcp at the moment
23:48 rue_house hmm
23:49 theBear grr... stupid grumpy tummy