#robotics Logs

Oct 18 2014

00:07 Tom_itx it's about that time
00:07 rue_house but I got THINGS i want to DO
00:07 rue_house like take closeups of arm5 for wolfmanjm
00:08 rue_house the new jukebox is spontaniously rebooting, I think I'd better move the drive contents to an SSD
00:19 MrCurious on itunes/apple tv http://www.imdb.com/title/tt1971325/
01:49 MrCurious a very nice movie
01:50 MrCurious and a very interesting 2nd law
01:50 MrCurious no self repair, no modification
09:52 rue_bed-aok the second law isn't to kill all humans? OOPS...
10:09 Skwint It would have to be a very fast robot to kill humans faster than we breed
10:10 Skwint hell, it would have to be damn impressive to kill humans faster than our road network does already
10:11 Skwint your best bet for wiping out the species would be to make a robot so insanely cool that everyone wants one, but which inherently contributes to global warming on a large scale
10:24 rue_house at 8 bits per channel, who can tell me what baud rate would be required for a hobby servo control stream to keep up with 8 servos at a 50hz update rate
10:27 Tom_itx the signal would remain the same, the only changes the baud stream needs to keep up with are position changes
10:27 Tom_itx Skwint bio warfare is quicker
10:31 Skwint but we combat bio warfare
10:31 Skwint we would defeat it
10:31 Skwint climate change we encourage and deny!
10:32 Skwint Especially because it wouldn't directly kill everyone - it would just slowly change the environment until noone can survive.
10:33 Skwint Sort of like smoking - if cigarettes had a 1 in 10,000 chance of blowing up and instantly killing you but were otherwise harmless they would be a lot less popular :)
10:57 Skwint Thinking about it - the US navy sends ships and people to help other countries with Ebola, and has been explicitly forbidden from taking any action to counter the effects of global warming :p
10:57 Skwint It's definitely the way to go - it's almost suspicious
11:01 rue_house you guys sisn't even think about it
11:01 rue_house geez
11:01 rue_house ok 8 channels 8 bit 50Hz
11:01 rue_house 8 bits takes 10 bauds..
11:01 rue_house so 80bauds in 1/50 sec
11:02 rue_house 4000 baud
11:02 Tom_itx so what we doin in class today?
11:02 Tom_itx huh?
11:02 rue_house so 4kbaud can keep up with 8 servo channels at 8 bit
11:02 rue_house so it would take 8kbaud to do 16 bit
11:03 rue_house so 9600 baud is sufficient to update 8 servos with 16 bit positions as fast as they are gonna respond
11:03 Tom_itx did you factor in skew and latency?
11:03 rue_house the usualy kids are none comming today and we might have a new kid comming, so I'll set up all the starter stuff again
11:03 Tom_itx aww
11:03 Tom_itx take 2 steps fwd and 3 steps back
11:04 rue_house na
11:04 rue_house its all forward
11:04 rue_house some bits just more than others
11:04 rue_house hmm, I suppose I cant just have prelene peanuts for breakfast
11:05 Tom_itx the PATA adapter did it's job
11:05 e_house has another hand
11:05 rue_house good show
11:05 Tom_itx i carry a bucket of peanuts in the car
11:05 Tom_itx snack along the way
11:06 Tom_itx never time to stop for that
11:07 rue_house I got the impression your average commute is about 40 feet
11:07 Tom_itx no not always
11:07 rue_house :)
11:07 Tom_itx sometimes it's an hour or more each way
11:08 rue_house heh, that dosn't actually argue it only being 40 feet
11:08 Tom_itx we're not slow like the canadian post
11:08 rue_house I need to work out what to have for breakfast
11:08 Tom_itx peanut butter
11:09 rue_house if canadian post could move at 40 feet an hour, people would rejoice
11:10 Tom_itx DK is supposed to arrive today
11:10 Tom_itx i'll be milling boxes this evening
11:10 Tom_itx and silkscreening lids
11:11 Tom_itx takes 3 programs
11:11 Tom_itx one for the holes and slots
11:12 Tom_itx a short one for the lid to finish the top edge of the slot
11:12 Tom_itx and one to mill off the inside risers that are in the way
11:15 rue_house ? same layout 3 programs?
11:15 Tom_itx 3 operations
11:15 rue_house but you have to remount dont you?
11:15 Tom_itx same setup
11:15 rue_house why not merge the programs?
11:16 Tom_itx first program the part gets rotated 3 times
11:16 rue_house ah, thats what I meant
11:16 Tom_itx no, there are slight changes to each setup
11:16 rue_house k
11:16 rue_house that makes more sense
11:16 Tom_itx the x0 y0 z0 stay the same
11:16 rue_house "why dont youget a 4 axis machine?" :)
11:16 Tom_itx no need
11:16 rue_house do you have a jig?
11:16 Tom_itx i have a vice
11:17 Tom_itx it locates it with a stop
11:17 Tom_itx you've seen it...
11:17 rue_house doyou have room for 3 boxes on the bed? one in each position?
11:17 rue_house possily, I have a memory like a siv, on the big stuff tends to not fall thru
11:18 Tom_itx https://www.youtube.com/watch?v=-CEqokrtFI4&feature=youtu.be
11:18 Tom_itx that's how the box is done
11:18 Tom_itx the lid is done the same way
11:18 Tom_itx the bottom millout the box is layed flat
11:19 rue_house just thinking, if you had room for 3 boxes, you could mill 3 at a time, one operation on each, and shuffle them down a slot, new boxes in one end, finished boxes out the other, latency of 2 boxes
11:19 Tom_itx not really room
11:19 Tom_itx i know what you're saying
11:19 Tom_itx it would take longer to move them than it currently does
11:19 rue_house not with the vise, but if you had a custom holding jig? I dont know how far your table moves
11:20 Tom_itx .032" endmill
11:20 Tom_itx 9"
11:20 rue_house its a nice setup
11:20 Tom_itx i don't need a custom jig
11:20 rue_house which drivers is that video?
11:20 Tom_itx the geckos
11:20 rue_house cool
11:21 Tom_itx i have another test for them
11:21 rue_house well, thats a number of prelene peanuts, 2 eggos and a few cups of OJ, can I call it breakfast?
11:21 Tom_itx https://www.youtube.com/watch?v=XhU7S8kifJ4&feature=youtu.be
11:22 Tom_itx square then a circle
11:22 rue_house the sherline is pretty simpel construction eh?
11:22 Tom_itx too simple
11:22 rue_house the head support get in the way?
11:23 Tom_itx sometimes yes
11:23 Tom_itx that's one reason i gotta move the aluminum blocks to do the base of the box
11:23 Tom_itx no clearance in Y
11:23 Tom_itx i do have to relocate Y for that one
11:24 rue_house seems odd they would put the support so low and then have the head be able to come up so high
11:24 Tom_itx for a 20tpi lead screw they're pretty quick
11:25 rue_house I been playing with some of those current controlled motor drivers, I can dial up steppers higher than I would have ever thought possable
11:25 Tom_itx they're wonderful
11:25 Tom_itx the chopper drives?
11:25 rue_house I gotta go get the shop ready
11:25 rue_house yea, the tiny fet ones
11:25 Tom_itx lets you run very high voltages
11:32 Tom_itx rue_shop2, that's how i can run 48v to them
11:33 Tom_itx i could have gone higher but that was the supply i found
11:39 rue_shop2 I have wooden boxes for scrwes that I think are over 20 years old
11:40 rue_shop2 I have plastic ones that are about 2 years old, and they aren't gonna make it to 3
11:45 Tom_itx i wish i could find more extruded aluminum enclosures i found at the surplus once
11:45 Tom_itx they're real nice for that
11:46 Tom_itx i used the smallest one for my pendant if you remember
11:46 Tom_itx some kind of aircraft enclosures
11:47 rue_shop2 mmm aircraft
11:50 Tom_itx http://tom-itx.ddns01.com:81/~webpage/cnc/psu/control7.jpg
11:50 Tom_itx bottom right
13:23 DanFrederiksen Tom_itx, why not get a real website?
13:24 DanFrederiksen they are quite inexpensive
13:25 Tom_itx just don't click on it if you don't care for it
13:57 DanFrederiksen that's not what I meant
14:34 LoRez it is a real website.
15:25 rue_shop2 DanFrederiksen, why not get a real attitude?
15:25 rue_shop2 did you finish your car yet?
15:47 Tom_itx haha
16:11 DanFrederiksen rue_shop2, I see you two are leading by example
17:17 rue_shop2 yay, I finished making a silly light box
17:19 Tom_itx for what?
17:19 rue_shop2 kids to learn parallel port
17:20 Tom_itx what kind of light box?
17:20 rue_shop2 teaching kids hello world is one thing, but being able to change leds on a box is a whole leap into the real world
17:20 Tom_itx i made a light box once but it was for viewing negatives
17:20 rue_shop2 somewereh I have a parport motor controller
17:20 rue_shop2 somewhere I have a parallel controlled robot too
17:20 Tom_itx linuxcnc is a parport motor controller
17:21 rue_shop2 yea, but kids have fun directly controlling things from a program on a computer
17:21 rue_shop2 you can go from 'here is how to turn the leds on and off"
17:21 rue_shop2 to 'now it controls these motors'
17:22 rue_shop2 without them having to write control code for steppers and such
17:22 Tom_itx i have a switch on the wall that controls my exhaust fan
17:22 rue_shop2 :) can you control is from qbasic software tho? :)
17:23 rue_shop2 I dont know what it is about computer programming, kids cling to it really well
17:23 rue_shop2 and when they are interested, learing to understand binary isn't too hard
17:23 rue_shop2 one of the 'programs' I have is to wire up a 7 segment to a parport, make numbers
17:24 rue_shop2 its somewhere after the lightbox
17:24 rue_shop2 the new kid din't show today :/
17:24 rue_shop2 maybe not a bad thing, i cant get the BASIC computer going
17:24 Tom_itx fire him
17:25 Tom_itx seems you can't get the linuxcnc computer going either
17:25 Tom_itx }:|
17:28 Tom_itx seems the mill might get a workout tonight
17:35 rue_shop2 I have to find a computer to use for the linuxcnc
17:36 Tom_itx look for an old one
17:47 rue_shop2 I cant, too many new computers in the way
23:26 Guest19572 hi all I am building an infrared sensor that receives a signal at 2kHz, I can get about 15 feet, here's my circuit: https://www.dropbox.com/s/vzb1dt3j2fnr8xs/beacon%20detector_v2.pdf?dl=0 can anyone give me some suggestions to extend the range?