#garfield Logs

Nov 10 2022

02:33 PM rue_mohr: I wonder, is there any point in having highschool listed on the resume? I'm thinking not
02:58 PM aandrew: no
02:58 PM aandrew: at our age nobody even gives a shit what your degree is, which is fortunate because i don't have one
02:59 PM rue_mohr: yea
03:14 PM rue_mohr: for the surge arrester for the cnc motor driver, I could either use protoboard or etch a pcb
03:14 PM rue_mohr: if I etch something, I'll need to dig out the plotter
03:14 PM rue_mohr: it suffers from flat surface syndrome
03:54 PM rue_mohr: I need to focus on projects I can finish quickly, abouta 2 week time span
03:54 PM rue_mohr: or less
03:54 PM rue_mohr: they can be subcomponents of a larger project
03:54 PM rue_mohr: I think its my best attack for getting stuff done
03:58 PM Tom_L: rue_mohr, you ever see this one? https://thechive.com/2014/10/22/mans-beautifully-sarcastic-resume-lands-him-the-job-at-mcdonalds-4-photos/
04:02 PM rue_mohr: haha
04:02 PM rue_mohr: nice
04:05 PM rue_shop3: cat awning
04:05 PM rue_shop3: injection molder
04:05 PM rue_shop3: surge arrestor
04:07 PM rue_shop3: you woldn't havppen to know when I last worked on the injection molder was eh?
04:09 PM rue_shop3: I had a swong arm set up...
04:19 PM Tom_L: quite a while
04:24 PM rue_shop3: iirc the problem was what temp to preheat the mold to
04:25 PM rue_shop3: too cold and the plastic freezes in the runners
04:25 PM rue_shop3: too hot and it burns going on
04:34 PM rue_shop3: oh wow, so close
04:35 PM rue_shop3: plastic got too brittle tho
04:35 PM rue_shop3: I had the injector temp set too high and it cooked it
04:36 PM rue_shop3: heh, this mold had no rake on it, does it..
04:40 PM Tom_L: rake?
04:44 PM rue_shop3: yea
04:44 PM rue_shop3: looks like I can use someof the bits of plastic that didn't come out to figure out the mold temp
04:47 PM rue_shop3: ah the hydraulic pressure is higher than the pressure needed for injection
04:47 PM rue_shop3: I need to clamp it
04:49 PM Tom_L: we figured that out last round
04:50 PM rue_shop3: oo hey, taking it apart still mildly hot worked
04:51 PM rue_shop3: almost
04:52 PM rue_shop3: the mold spits out easy at that front knee
04:56 PM Tom_L: i nearly forgot i did those
05:01 PM Tom_L: did that guy get rid of his drill?
05:01 PM Tom_L: you probably don't see him much now
05:03 PM rue_shop3: oh I'll ask now
05:07 PM rue_shop3: drat I criss-crossed the mold again
05:08 PM rue_shop3: I'm gonna file a corner off
05:08 PM Tom_L: or that
05:08 PM Tom_L: i was gonna suggest cutting a mark int he side
05:14 PM rue_shop3: so, notes for education of it
05:14 PM rue_shop3: - rake!
05:14 PM rue_shop3: - non-symmetric locaotor pins
05:14 PM rue_shop3: - (the threads bind on the seperators, not sure on that yet)
05:15 PM rue_shop3: and I think edge injection, even tho it needs clamps, might have been a better route
05:15 PM rue_shop3: did I send you any bits of injection molded deer yet?
05:17 PM Tom_L: maybe
05:17 PM Tom_L: why do you think edge is better?
05:18 PM rue_shop3: not sure yet
05:18 PM rue_shop3: my temps are getting closer
05:19 PM rue_shop3: I think the thermocouple on the injector is way off
05:19 PM Tom_L: rake angle where?
05:19 PM Tom_L: not on an injection mold..
05:22 PM Tom_L: bak later
05:24 PM rue_shop3: the inside, the 90 degree edges dont release
05:25 PM rue_shop3: minimum temp on the iron is good for the mold temp
05:28 PM rue_shop3: I might need to purge the plastic out of the injector
05:28 PM rue_shop3: but the piston keeps getting stuck
05:30 PM rue_shop3: and I think I need a release coating of some kind
05:50 PM rue_shop3: yea its burning the hell out of the plastic in the injector
05:50 PM rue_shop3: and even if I do get a good injection, its brittle as hell and wont come out
05:54 PM rue_shop3: I wonder what they did different
06:07 PM rue_shop3: I think I should cast an aluminum block around the element and tube for the injector
06:07 PM rue_shop3: heat distribution
06:07 PM rue_shop3: :/ I dont think I'm gonna get any deer made for christmas
06:23 PM rue_shop3: Tom_L, yes, he still has the cutter and would love a new coupler
06:23 PM rue_shop3: would you like to send the one or?
06:53 PM aandrew: got some cheap diamond hole saws, gotta cut some coupons out of some mystery PCBs and polish them to try and figure out their stackups
08:04 PM rue_shop3: what if
08:04 PM rue_shop3: aandrew, :)
08:04 PM rue_shop3: what if
08:04 PM rue_shop3: you took a white noise source
08:04 PM rue_shop3: and used a voltage programmable filter, with a high Q to get the frequncy you want
08:19 PM Tom_L: we don't know if the metal one will fit right so i may run a couple from plastic again
08:21 PM rue_mohr: if you like, how much financial should I try to get to you for it?
08:21 PM rue_mohr: I cant be awake latley, I'm tryin
08:22 PM Tom_L: let's get the parts first
08:22 PM rue_mohr: its starting to freeze overt here?
08:22 PM rue_mohr: oh damn, that reminds me, I hve to go save the greenhouse pump
08:22 PM Tom_L: no but the temp is dropping
08:23 PM Tom_L: 28 22 25 30 26 23 23 23 25 24... 10 day forecast low
08:23 PM Tom_L: in farenheightest units
08:24 PM rue_mohr: well I made a little ADC circuit
08:24 PM rue_mohr: the main concept worked
08:24 PM Tom_L: so yeah it's gonna freeze
08:25 PM rue_mohr: oh, freezing is 32?
08:25 PM Tom_L: yup
08:25 PM rue_mohr: ah
08:25 PM rue_mohr: its 4c, here now
08:25 PM Tom_L: close
08:26 PM rue_mohr: it hit -0.5c then bounced back up
08:26 PM rue_mohr: at 2c we got snow
08:26 PM Tom_L: i think that job is still set up out there
08:26 PM Tom_L: need to find some plastic and maybe chop another hunk of brass off
08:26 PM rue_mohr: the injection molder isn't right
08:27 PM Tom_L: we have determined that from the beginning
08:27 PM rue_mohr: and I think the plastic in it was already burnt
08:27 PM rue_mohr: I think I need to cast aluminum around the tube/element to bind them
08:27 PM rue_mohr: even out the heat, add some thermal mass
08:28 PM rue_mohr: the ones online look so simple
08:30 PM rue_shop3: I wonder if I can just cast around that
08:31 PM rue_shop3: its kinda a do or die project anyhow, if I'm wrong, there isn't really another path I could have taken
08:33 PM Tom_L: needs better distributed heat not one really hot spot
08:38 PM rue_mohr: ok, I got the pump drained
08:39 PM rue_mohr: well, the elements coiled around a pretty good length
08:39 PM rue_mohr: thought that work out out
08:39 PM rue_mohr: the temp sensor is pinned between to coils, with the end on the tube
08:58 PM aandrew: rue_shop3: I think if you used a programmable filter with a white noise source you just waste a lot of energy filtering out what you went to trouble making a lot of
08:58 PM aandrew: rue_shop3: I don't see why it wouldn't work, in a Rube Goldberg kind of way
08:59 PM aandrew: I'm reading up on I/Q relationships and modulation (again)
08:59 PM aandrew: I swear this stuff is like Perl to me... I spend a lot of time learning it, understanding it and then 3mos later its heiroglyphs
08:59 PM aandrew: I've forgotten it all
09:02 PM aandrew: someone was talking about using a VCXO and ramp or noise circuit to drive the V to make a spread spectrum clock
09:02 PM aandrew: your comment about white noise + prog filter reminded me of that
09:03 PM rue_mohr: it was a thought for a vco
09:04 PM rue_mohr: I'm having troubles with a single supply 0-5V input vco
09:04 PM rue_mohr: with a 16x range
09:04 PM rue_mohr: well
09:04 PM rue_mohr: technically a voltage controlled monostable
09:04 PM rue_mohr: linear
09:16 PM aandrew: so this WWVB receiver module seems to only be able to receive the signal in the evenings
09:16 PM rue_mohr: uh?
09:16 PM rue_mohr: signal strength?
09:18 PM aandrew: probably, I mean 60kHz propagation from the other side of the continent is going to be all over the map
09:20 PM aandrew: I mean it's AM too which makes it worse
09:21 PM aandrew: https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwvb/help-wwvb-radio-controlled
09:21 PM aandrew: "Note that the red area is largest at night, and smallest in the daytime"
09:39 PM Tom_L: so rue_mohr,
09:43 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/coupler/Coupler_brass4.jpg
09:52 PM rue_mohr: gee your machine is fast
09:52 PM rue_mohr: I cooked supper
09:55 PM Tom_L: i'll see if i can screw them up tomorrow
09:55 PM rue_mohr: :)
09:56 PM rue_mohr: just dont break a bit!
09:56 PM Tom_L: i clean the bottom with a .500 carbide endmill. i don't think it will give much
09:56 PM rue_mohr: ok, so I kinda accomplished nothing today
09:57 PM Tom_L: you worked on your resume
09:57 PM rue_mohr: yea, still picking at it, hard stuff is done
09:57 PM Tom_L: whittle it down to just the bare facts
09:58 PM rue_mohr: yup
09:58 PM rue_mohr: I'm just trimming the minor stuff now
09:58 PM rue_mohr: between prying my eyes open
10:04 PM Tom_L: i might lay those sideways so the vise can pinch the part as i use Y to cut the excess off instead of Z
10:05 PM rue_mohr: dont want it to coem loose and jam the bit
10:05 PM Tom_L: the bit didn't care the last time. it just chopped the part in half
10:06 PM Tom_L: the old sherline spindle motor would have just stalled
10:07 PM rue_mohr: heh
10:08 PM Tom_L: my kid has been skim cutting a new surface on the work plate on the machine he runs
10:08 PM Tom_L: taking 2 weeks so far
10:08 PM Tom_L: it's about 180
10:08 PM Tom_L: ' long
10:08 PM Tom_L: and probably 60" wide or so
10:09 PM Tom_L: he's only doing half though which is 90'
10:09 PM Tom_L: it's a double gantry with 3 spindles on each gantry
10:09 PM rue_mohr: did he say how far its out so far?
10:10 PM rue_mohr: I'd imagine it could have settled a lot since it was installed
10:10 PM Tom_L: https://machinehub.com/listings/257073-cincinnati-3-spindle-5-axis-cnc-gantry-profiler
10:10 PM Tom_L: only with another gantry on it
10:10 PM Tom_L: and longer
10:11 PM Tom_L: i dunno what he said but he probed it before starting and found the low spot and is cutting it to that
10:11 PM Tom_L: iirc something like .020" variance
10:12 PM Tom_L: they'd been using it to just rough parts but now they want to run them complete
10:12 PM rue_mohr: 20 thou is huge
10:12 PM Tom_L: i think he said there's 40" between spindles
10:12 PM Tom_L: over that entire span but yeah
10:13 PM Tom_L: they probably don't use parts of it all the time
10:13 PM rue_mohr: yep
10:13 PM rue_mohr: oh mail!
10:14 PM Tom_L: he said they have 10 of those in the shop
10:30 PM rue_mohr: WHAT!
10:31 PM rue_mohr: 1 shop each?
10:31 PM Tom_L: no it's a big place
10:31 PM Tom_L: i don't think they're all double gantry though
10:31 PM rue_mohr: why cant I have a big palce :(
10:32 PM Tom_L: i met the guy that had that shop before he retired and this new bunch bought it out
10:35 PM Tom_L: he started it in 1966 and died at the age of 81
10:36 PM rue_mohr: I wonder if he was alwys in debt
10:36 PM rue_mohr: I need to learn to live in debt
10:36 PM rue_mohr: and enver get called on it
10:40 PM Tom_L: https://www.bizjournals.com/wichita/stories/1998/05/04/story2.html
10:43 PM Tom_L: i don't think it's the same company that has it now
10:57 PM rue_mohr: oh wait, facebook is cutting jobs too!?
10:57 PM rue_mohr: iiinteresting
10:58 PM rue_mohr: how social media didn't pay off :)
11:01 PM rue_mohr: the market must be overflowing with social media programmers
11:02 PM rue_mohr: just after the twitter layoffs too
11:02 PM rue_mohr: huh
11:02 PM rue_mohr: there are gonna be ripplies
11:02 PM rue_mohr: ripples
11:02 PM rue_mohr: thru other businesses
11:02 PM rue_mohr: esp the ones that support those
11:04 PM rue_mohr: wait, I could cast it in lead
11:05 PM rue_mohr: or would that be harder...
11:13 PM rue_mohr: I got some chip carrier boards, but I dont remember what chips I wanted to do tiwht them