#robotics Logs

Jul 13 2018

12:14 AM rue_shop4: ok I been playing with pll arrangements all night
12:18 AM rue_shop4: I blew up my only 74HC74, which I kinda needed. the phase comparator made form the 74ls74 cant drive the servo well,
12:18 AM rue_shop4: ALL the 7490s I have,less one are just that, not 74LS90, not 74HC90, but *just* 7490
12:18 AM rue_shop4: I'm using a 74S90 I found, but it might be a mess with 10Mhz
12:18 AM rue_shop4: hmm
01:16 AM rue_mohr: one of the interesting things about pfm logic, is there would be verry little signal delay
08:39 PM rue_mohr: busy irc day
08:45 PM Tom_shop: sure is
08:45 PM Tom_shop: working on a mill setup
08:56 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Skate_truck/Setup1.jpg
09:15 PM rue_shop3: have you used the nozzel yet?
09:16 PM rue_shop3: resin might help with the gaps between the motor and the pipe
09:18 PM Tom_shop: what nozzle?
09:18 PM rue_shop3: coolant
09:18 PM Tom_shop: yes
09:19 PM Tom_shop: using it right now
09:19 PM rue_shop3: continious or pulse?
09:21 PM Tom_shop: continuous but very low mist
09:21 PM Tom_shop: as much as i'm cutting it needs to be continuous
09:22 PM Tom_shop: right now i'm just squaring up blocks and setting up the program
09:59 PM Jak_o_Shadows: we've gotten to the stage where the computer is less reliable than the 3d printer
10:34 PM rue_shop4: hahah the diy 3d printer
10:34 PM rue_shop4: the sherline I borrowed broke down, controller, Z axis cant be operated by the arduino anymore
10:38 PM rue_shop3: wow, thats a lot of really fine semi-metalic dust
10:42 PM rue_shop3: oh, there is a bug in the circuti
10:42 PM rue_shop3: specifically a moth
10:56 PM Tom_L: what broke on it?
10:57 PM Tom_L: made that material stop tonight amongst other things
11:06 PM rue_shop3: I think the arduino lost its ability to drive the io ports
11:06 PM rue_shop3: cleaned it out, checking, I need to grab its settings if I'm going to swap it out
11:06 PM rue_shop3: I know the drivers are ok, cause the pendent drives them directly
11:07 PM Tom_L: wonder what caused the avr to die
11:07 PM Tom_L: are they opto isolated?
11:16 PM rue_shop3: no, but its a gecko drive, and I think they are in there
11:16 PM rue_shop3: it IS a chineese avr
11:17 PM rue_shop3: its logically functioning ok, just the avr dosn't seem to be sending out the step/dir signals on a few of the axies
11:18 PM rue_shop3: OR the buffer is shot in my pendant interceptor, but I dont think so
11:18 PM rue_shop3: so, ok, I'll make a new controller in a bit
11:21 PM rue_shop3: the interesting part is that it failed *just sitting there*
11:22 PM rue_shop3: aka it was running fine, sat for ~month, and then didn't work
11:24 PM Tom_L: did you check it on the scope?
11:24 PM Tom_L: i've had odd things like that happen
11:26 PM rue_mohr: the pendant control proof is enough for me
11:26 PM rue_mohr: I'll swap out the arduino and see where it stands
11:33 PM Tom_L: i was surprised the cooler worked as good as it did
11:41 PM rue_shop4: wtf, is there a new resistor code, my 1% 2k 0603 resistors say "30B" on them
11:41 PM rue_shop4: wtf there is
11:42 PM rue_shop4: the 30 stands for 20.0 and the B means *100
11:42 PM rue_shop4: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwiw7Pai453cAhW6CTQIHWMEBjoQFjAAegQIAhAC&url=https%3A%2F%2Fwww.venkel.com%2Fmedia%2Fwysiwyg%2Fcategories%2Fdocs%2F0603-marking-code-venkel.pdf&usg=AOvVaw18_Yck6v8EPd2e9uRHZAxk
11:42 PM rue_shop4: ugh
11:47 PM rue_shop3: put that page in the SMT book
11:48 PM rue_shop3: getting quite a collection of little rolls of smt resistors in the bulk stuff
11:51 PM rue_shop3: odd, tho, thought I got 1%
11:52 PM rue_shop3: nope I got 5%
11:53 PM rue_shop3: arg, I GOT THEM FOR DACs
11:53 PM rue_shop3: and I got 5%
11:53 PM rue_shop3: @$!^%@$%
11:54 PM rue_shop3: so, I'm trying to think how I can stabalize the freq gen
11:54 PM rue_shop3: more...
11:54 PM rue_shop3: my current HP one drifts about 10-30hz
11:54 PM rue_shop3: without the pll control the one I made drifts maybe 200h
11:55 PM rue_shop3: z
11:55 PM rue_shop3: wit the pll control it jitters by about 4KHZ, lets not talk about that