#robotics Logs
Nov 19 2017
#robotics Calendar
12:10 AM rue_shop3: but my flipflop is good to like 100Khz
01:24 AM Jak_o_Shadows: Ok. got my binary tree looup type thing working I think
02:18 AM rue_shop3: buck converter isn't panning out for me
02:19 AM rue_shop3: everytime I think I'v got something good, I notice that I can remove the wheeling diode, short the inductor, and I get almost the same performance
03:50 AM rue_bed: arg, the sleep thing is getting really annoying
03:51 AM To_Aru_Shiroi_Ne is now known as ToAruShiroiNeko
05:22 AM anonnumberanon: lol what?
05:22 AM anonnumberanon: can't sleep?
06:42 AM weyland|yutani: anonnumberanon, i think he doesnt want to sleep sleep=lost worktime
11:28 AM rue_bed: wow
11:28 AM rue_bed: major rainstorm and power outage
11:40 AM veverak: hmm
11:40 AM veverak: it seems I still can't raise error with scad
11:42 AM veverak: got damn it, not even echo in function? :(
12:09 PM rue_: not bad, my UPS held up for the 3 hours power outage last night
12:09 PM rue_: 2.5 hr or so
12:14 PM rue_ is now known as rue_mohr
12:14 PM rue_mohr: put the network back togethor again...
12:16 PM SpeedEvil: Mine is ~20 hours at minimal load condition.
12:16 PM SpeedEvil: that is - computer, network, ...
12:16 PM SpeedEvil: Getting more batteries so it'll do fridge too
12:20 PM rue_mohr: I had a 5kw trusine ups, the damn thing died on me
12:22 PM rue_mohr: seems that its not turning the inverter on, then saying there was no output
12:32 PM SpeedEvil: I'm pondering making my own UPS using the true-sine modules.
12:52 PM rue_mohr: do they run at 57Khz pwm?
12:52 PM rue_mohr: a stm32 costs less
12:53 PM rue_mohr: and if it cant pump the pwm out fast enough, I have a rom image with built in sine pwm
12:56 PM rue_mohr: preboost dc-dc, then invert with IGBTs
12:56 PM rue_mohr: with pwm, then filter
12:56 PM rue_mohr: LC filter
01:00 PM rue_mohr: 60 600 6k 60k
01:00 PM rue_mohr: 3 decades up
01:00 PM rue_mohr: should filter nice
01:01 PM rue_mohr: 160V at -9db
01:01 PM rue_mohr: I never get filter math right
01:02 PM rue_mohr: an avr, maybe less overlocking, isn't fast enough to generate 60Hz 8 bit pwm
06:35 PM veverak: https://imgur.com/a/L8k2b
06:35 PM veverak: ok, my scad skills were not lost
06:37 PM AchiestDragon: veverak: sweet
06:38 PM veverak: thanks
06:38 PM * veverak likes showing off a bit
06:38 PM veverak: well, tomorrow it will be pprinted
06:38 PM veverak: I suppose I will be more humble during that process
06:44 PM AchiestDragon: https://drive.google.com/file/d/19oWFo8JOEwNClHXCBlYCOYLK8vNC1eTS/view?usp=sharing , around 1000 lines of scad script to do that one
06:46 PM veverak: NICE
06:58 PM AchiestDragon: blender is quite good once you get the hang of it , https://drive.google.com/file/d/1I12bDk8ZVXswGuoF4q1ahxXICx4mrjnO/view?usp=sharing around 8 days to do that one
06:59 PM veverak: coool :)
07:23 PM rue_shop3: how long did it take?
07:24 PM rue_shop3: veverak, but I can see your polygons :)
07:25 PM rue_shop3: AchiestDragon, is the center thing on the beam a resonance unit?
07:26 PM rue_shop3: why is the HP path split in two?
07:27 PM AchiestDragon: no its a valve swiching toggle , it clicks over like a toggle switch when the beem rocks to change the steam flow
07:29 PM rue_shop3: oooh
07:29 PM rue_shop3: switching improvement
07:30 PM rue_shop3: not seen that before :)
07:30 PM rue_shop3: it almost looked like some kinda anti-phase vibration damper
07:31 PM rue_shop3: hmm its a squirrel
07:31 PM rue_shop3: iiinteresting
07:31 PM rue_shop3: hmm, so I need to move the cnc machine and a computer workstation
07:32 PM rue_shop3: need a snti-splatter box for the cnc to live in
07:32 PM rue_shop3: saw a nice one made of a rubbermaid tub
07:33 PM rue_shop3: and the pipe fittings rubermaid tub is disintegrating in just the right way to use, if I can work out getting the pipe fittings out of it
07:33 PM rue_shop3: its amazing how much room pipe fittings take up
07:33 PM rue_shop3: oh, and I'm supposed to be aggragating boxes of pcbs
07:34 PM AchiestDragon: yea
07:34 PM rue_shop3: tho, I cant move the 2d printer to where I'm clearing space, cause its too tall
07:36 PM AchiestDragon: working on robot parts atm https://drive.google.com/file/d/1SEYHjJtH7Bh_chSu3O9MbjZdFnvxeJw5/view a 60mm linear actuator based on a motor and 3mm threaded bar , couple of bearings and fixing hw , still have microswitch ends stops to do and mountings for a 60mm slider pot
07:41 PM rue_shop3: k, nice motor bracket
07:41 PM rue_shop3: whats it moving?
07:41 PM * rue_shop3 keeps trying to grab and rotate the model
07:41 PM rue_shop3: ONE DAY IT WILL ALL BE IN 3D
07:44 PM AchiestDragon: https://drive.google.com/file/d/1oGalfR7BN6cpuDIekHGcl5hcBcrUN5Ua/view?usp=sharing view of parts layed out for printing
07:45 PM rue_shop3: support on the bridge eh?
07:48 PM robotustra: https://imgur.com/KiYzLwT hmmmm
07:48 PM AchiestDragon: yea , the center carrage (2 parts ) i got slots in there for washers , 2 nuts to mount in there with an anti backlash spring between one and one of the washers , although dont know how hard its going to be to find a sutable supply of such springs , may end up using a rubber o ring instead
07:49 PM rue_shop3: robotustra, have to take a lot more off that one
07:49 PM rue_shop3: springs aren't that hard to source
07:49 PM robotustra: not much, one day about
07:49 PM rue_shop3: unless your trying to specify a clockwise or counterclockwise one
07:50 PM robotustra: I did it with grinder
07:50 PM rue_shop3: "how to get the guy in the fastners store to look at your funny"
07:50 PM rue_shop3: robotustra, yea
07:51 PM rue_shop3: robotustra, it from a boat or something?
07:51 PM robotustra: didn't got
07:53 PM AchiestDragon: springs themselves that small prob wont take the strain without buckling so maybe rubber orings would be better , the nuts fixed so not that its going to spin , and servs only to remove the backlash over using a single nut
08:11 PM robotustra: in 22 prints I did from this state https://imgur.com/52vA4VW to this one https://imgur.com/KiYzLwT
08:11 PM robotustra: and all this stuff is within 20 microns
08:12 PM robotustra: unfortunately I have to flaten 8 surfaces like this
08:12 PM robotustra: :(
08:12 PM robotustra: 2-3 weeks of scraping
08:13 PM robotustra: the only reason I'm doing it - I'll have precise lathe :)
08:34 PM rue_shop3: oh is that cast?
08:35 PM rue_shop3: I thought it was a pitted piece of alum hull off a boat
08:38 PM rue_shop3: this is like the anti-conservation of mass
08:39 PM rue_shop3: if I swap the position of things in the shop, there is space left over
08:39 PM rue_shop3: its kinda creeping me out
08:39 PM rue_shop3: I'm almost up to about 4 square feet of bench space
08:41 PM AchiestDragon: i could not maintain 4ft square of free space for long before it gets fille by somthing ,, think thats why sience keeps trying to explain theres no such thing as truely empty space
08:42 PM rue_shop3: I wonder how long the shop server ups held up for
08:43 PM rue_shop3: the stupid emergency light just dies again
08:43 PM rue_shop3: its eating batteries
08:43 PM rue_shop3: chargers gone wrong, they do
08:45 PM robotustra: < rue_shop3> oh is that cast?
08:45 PM robotustra: no it's just steel
08:45 PM robotustra: not cast irin
08:45 PM robotustra: iron*
08:46 PM AchiestDragon: case hardened steel ?
08:46 PM robotustra: 8x8.5"
08:46 PM robotustra: A500
08:46 PM robotustra: constructon steel I think
08:47 PM robotustra: I hope I'll get at least 10 mictons of precision for parts on this device
08:48 PM AchiestDragon: i'd be tempted to put them on the miller with a fly cutter and skimm the surface like you would the top of a cylinder block
08:48 PM robotustra: I don't have any miller around
08:48 PM robotustra: I would like to
08:49 PM robotustra: but I don't have any known huy who can do this for me
08:49 PM robotustra: guy*
08:51 PM robotustra: actually with scraping I can acheave a flatness within microns
08:51 PM AchiestDragon: ask at the local garrage or engine reconditioners , they usualy have a mill capable , it costas about £40 for a cylinder head skimming to a few microns
08:51 PM robotustra: and what is more important - I can ferify it at home
08:52 PM robotustra: it's montreal
08:52 PM robotustra: you know that this is a city of f*cking anf gays
08:52 PM robotustra: no heavy industry in here
08:52 PM robotustra: :)
08:54 PM robotustra: and I think to grind surfaces 8x8" of 4 plates - and a bunch of rails - it can cost me like 500$ or so
08:54 PM robotustra: better I'll make it at home for free
08:54 PM robotustra: I got all necessary tools for this
08:57 PM rue_mohr: you have seen how a grinder for flat surfaces works?
09:01 PM robotustra: yes
09:02 PM robotustra: actually this plates should be milled first before grinding
09:03 PM robotustra: this plate I made today was 0.30 mm concave in the middle
09:04 PM robotustra: and of cause it's 0.3 mm convex on the other side :)
09:05 PM robotustra: anyway I'll try to look for machinists in mtl
09:10 PM AchiestDragon: the last engine i rebuilt , https://drive.google.com/file/d/196hrlU-wAKvHwStlht8WkwZZkgGHXHGq/view?usp=sharing
09:14 PM robotustra: last time I was rebuilding an engine were more than 25 years ago, and of cause all machining was done by real machinists
09:14 PM robotustra: I'm not true machinist, and all my cnc machines are toys :)