#robotics Logs

May 24 2015

03:23 vanschagen any body there?
03:34 deshipu no
03:43 Jak_o_Shadows yo
10:16 verak finished first design of water-cooled nozzle,
10:17 veverak http://i.imgur.com/WzbmUG7.png
10:24 SpeedEvil I have a water cooled nozzle too.
10:24 SpeedEvil I should really get out of the shower.
10:30 Jinxit SpeedEvil: I would say that's water heated
10:31 SpeedEvil My water heater isn't working so well.
14:27 rue_shop3 SpeedEvil, you shouldn't irc while showering
14:49 SpeedEvil Bah. They said I shouldn't solder naked too.
14:51 MrCurious soon they will say that beard pony tails are bad to have around the lathe
14:52 SpeedEvil https://www.youtube.com/watch?v=Sw8jK3XVA0U
14:52 SpeedEvil reminds me of
15:40 niepoo is here, happily watching Kevin install the Tor
17:53 Mr anyone know where to find the codes needed to read the angle of a gyroscope with arduino uno?
18:50 SpeedEvil Does nayone happen to recall enough details to google a 'from the beginning' genetic gait optimisation for robots?
18:51 SpeedEvil The first generation flopped around a lot - then the 10000th was running competantly
19:11 Jinxit SpeedEvil: related: https://vimeo.com/79098420
19:11 SpeedEvil http://www.ics.uci.edu/~rickl/courses/cs-271/lit/2013-TOG-MuscleBasedBipeds.pdf
19:11 SpeedEvil yes - I should have posted that someone else had linked me to it
19:12 SpeedEvil that was exactly the paper I was thinking of.
19:14 MrCurious esp8266-11 cactus-micro daughter board upgraded to nodemcu, cactus-micro convertedd from software serial to hard serial
19:14 MrCurious now i am cooking with butter!
20:07 MrCurious and now to fabricate a FTDI board to esp-11 adapter board.
23:27 eadthem i need to make a air seal that will rotate
23:27 eadthem not fast, and not consantly
23:27 eadthem i was thinking of having 2 PTFE sheets that just slide aganst each other for the seal
23:27 eadthem this dosent have to hold back great pressure (Shop Vac).
23:28 eadthem thoughts ?
23:28 Tom_itx compressor quick connects come to mind
23:29 eadthem its literaly for a shopvac,
23:29 eadthem so im working with 2 inch ID PVC
23:29 Tom_itx what if it leaks some?
23:29 eadthem small ammounts, no big deal
23:30 Tom_itx the hose itself is pressed on the end nozzle
23:30 Tom_itx do something like that
23:37 eadthem mmm think i have something that might work
23:37 eadthem thanks
23:38 Tom_itx you still doin board repair?
23:39 eadthem at work?
23:39 Tom_itx yeah
23:39 Tom_itx or wherever
23:39 eadthem kinda
23:39 eadthem im the robotics programmer and SMT manager for last few years
23:40 Tom_itx i got a board i need to get 3 chips off one of these days and i don't feel like screwing it up with an iron
23:41 eadthem by programmer i mean Universal instruemnts software, and about 80K lines of C++ and PHP to make it work with a AOI robot, , SMT work instructions, setup, kitting, AOI repairs, Validation...
23:41 eadthem :p
23:42 eadthem what kind of chips
23:42 Tom_itx buffer chips to an FPGA
23:42 eadthem what package?
23:42 Tom_itx soic i think or ssop
23:43 eadthem got some old boards around to practice with?
23:43 Tom_itx i can probably do it with the iron, i just don't wanna lift any traces
23:43 Tom_itx i don't need the practice
23:43 eadthem not with a iron but with something better
23:43 eadthem that youve probably not used before,
23:43 eadthem well in this way at least :p
23:43 Tom_itx don't have a hot air gun... wish i did
23:43 eadthem well of course not
23:43 eadthem do you have a paint stripper heat gun?
23:44 Tom_itx nope
23:44 eadthem owell there cheep
23:44 eadthem very cheep
23:44 Tom_itx i know
23:44 Tom_itx i'd have to put a smaller nozzle on one
23:44 eadthem naw
23:44 eadthem http://www.homedepot.com/p/Sioux-Chief-3-in-x-4-in-PVC-DWV-Closet-Flange-886-PPK/202313218?N=5yc1vZbuvlZ25ecod#product_description
23:44 eadthem i recommend that one
23:44 Tom_itx don't wanna melt the headers near the chips
23:44 eadthem mmm ya there sensitive
23:44 eadthem this is best for sensitive
23:45 eadthem see you clamp your work at about 1 to 1.5 feet off the top of a table
23:45 eadthem set the heatgun underneath on high
23:45 eadthem and thats it
23:45 Tom_itx that was a pvc flange
23:45 eadthem i recommend about 4 inches distance
23:45 eadthem http://www.amazon.com/Wagner-0503008-HT1000-200-watt-Heat/dp/B00004TUCV/ref=sr_1_1?s=industrial&ie=UTF8&qid=1432527746&sr=1-1&keywords=heat+gun
23:45 eadthem try that link :p
23:46 eadthem a IR thermometer helps, but is not required
23:47 Tom_itx and it's RoHs too so needs to be a little hotter
23:47 eadthem it will take probably 4 to 8 min with 4 inch gap on high
23:47 eadthem you may wish to try 4 5 and 6 inch gaps to get some experence, using a heatgun while haveing a PCB over it
23:47 eadthem and on some scrap boards
23:47 eadthem any old PCI or ISA card will do
23:47 eadthem or old HDD boards
23:48 eadthem just to try it once before hand.
23:48 eadthem Ya we use this setup at work on a daily basis for rework, ususaly we preheat with a heatgun underneath, and then bring it over the edge with hot air.
23:48 eadthem but you can use the heatgun to fully heat it
23:49 Tom_itx i could put foil over the headers
23:49 eadthem its a 1 sided board?
23:49 Tom_itx no
23:49 Tom_itx 1 side parts yes
23:49 eadthem are there sensitive parts only one side
23:49 eadthem k just put componet side up
23:50 eadthem thats the normal way anyhow
23:50 eadthem your heating the part and board from the bottom with a heatgun
23:50 eadthem thrue the boad
23:50 eadthem board
23:50 Tom_L http://store.mesanet.com/index.php?route=product/product&filter_name=7i90&product_id=291
23:50 Tom_itx the 3 by the headers
23:51 Tom_itx or at least one of them
23:51 eadthem ya no issues
23:51 eadthem put heatgun on table, put clamp holding board on something so board is 4 inches over the top of the heatgun
23:52 Tom_itx even with RoHs?
23:52 eadthem you could wrap the edge connectors with foil, or capton tape if you wish (capton works well)
23:52 eadthem component side up
23:53 eadthem http://www.amazon.com/Wagner-0503008-HT1000-200-watt-Heat/dp/B00004TUCV/ref=sr_1_1?s=industrial&ie=UTF8&qid=1432527746&sr=1-1&keywords=heat+gun
23:53 eadthem http://www.amazon.com/Mil-Kapton-Tape-Polyimide-yds/dp/B007GBZ952/ref=sr_1_4?s=industrial&ie=UTF8&qid=1432528232&sr=1-4&keywords=capton+tape
23:53 eadthem keep in mind, there is no secret to RoHs
23:53 eadthem just heat it hotter
23:53 Tom_itx i know
23:53 eadthem and its only 20 to 30 degrees
23:54 Tom_itx it won't hurt the board heating from the bottom thru it?
23:54 eadthem nope
23:54 eadthem not realy much worse than a Reflow Oven
23:55 eadthem which heats both sides with 250 - 280 C air for about 30 to 60 seconds
23:56 eadthem lead 183C , SAC305 Lead free 217C, SN100c 227C
23:56 Tom_itx o
23:56 Tom_itx i'll consider it
23:56 eadthem To give ya a idea of what a board goes thrue in reflow.
23:57 Tom_itx i'm getting another board anyway but would like to fix it for a spare
23:57 Tom_itx i've got a toaster oven.. i know
23:57 eadthem well then
23:57 eadthem mmm ya thats right, :P forgot
23:58 Tom_itx i've used a clothes iron before
23:58 Tom_itx but for smaller boards