#garfield Logs

Apr 17 2020

12:22 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/Turners_cube1.jpg
12:28 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/Turners_cube2.jpg
12:28 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/Turners_cube3.jpg
12:35 AM rue_mohr: nicely done
12:35 AM Tom_L: i finished the big cube for my kid since he can't go to vo'tech
12:35 AM Tom_L: he had it squared up, i did the rest
12:44 AM Tom_L: rue_mohr, make one of those on a sherline :D
12:51 AM rue_mohr: mmmm
12:51 AM rue_mohr: I still dont ahve blocks large enough
12:58 AM Tom_L: make a small one
12:58 AM Tom_L: i did a 1" one once
12:59 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/TurnerCube.jpg
01:00 AM Tom_L: i might have done that one on the sherline... i'm not sure. i kinda doubt it or it wouldn't have turned out
01:05 AM rue_mohr: I'd nee to go thru my cast blocks
09:34 AM rue_bed: trading account
09:34 AM rue_bed: 2 barrels gas
09:34 AM rue_bed: 14 day
09:35 AM rue_bed: mailbox
09:43 AM rue_bed: printer firmwares
09:51 AM aandrew: https://i.imgur.com/yQFDign.jpg made me laugh way too hard
09:53 AM polprog: https://twitter.com/ellenfromnowon/status/1246410301555331078
11:19 AM Tom_L: you gonna trade 2 barrels of gas for 14 days in the mailbox? not a very good trade imo :)
12:15 PM rue_mohr: wtf is this 5G thing?
12:16 PM rue_mohr: how did it even start?
12:16 PM rue_mohr: who listens to a crazy person
12:16 PM rue_mohr: oh, wait, trump is the us president
12:16 PM rue_mohr: nevermind
12:45 PM rue_mohr: I might have to wait till the election to buy stocks
12:47 PM rue_mohr: damn the rbc for crashing during my application
02:48 PM aandrew: I have no investments
02:57 PM rue_mohr: I figured things would go back into crashing
02:57 PM rue_mohr: I'm not even sure why their going up
02:57 PM rue_mohr: maybe its trumps money factory?
03:16 PM polprog: what, apart from a soic-8 and soic-14 breakout could be useful? im making a kicad_pcb of single sided smd breakouts for breadboards
03:16 PM Tom_L: one of everything
03:16 PM Tom_L: sot-23
03:17 PM polprog: i was thinking about sot223-3
03:17 PM Tom_L: they used to send those to me free on pcb orders
03:17 PM polprog: oh yeah sto23 as well
03:17 PM polprog: idk, the smd breakout here are just crazy expensive
03:18 PM rue_mohr: its nice to have a soic adapter long enough to fit two soic 8 on side by side
03:18 PM rue_mohr: which is typ a soic18
03:19 PM rue_mohr: (1 spece btween chips)
03:19 PM polprog: good idea
03:19 PM rue_mohr: R-2R ladders if you need them
03:19 PM rue_mohr: cause why are they cheaper to make than to buy?
03:19 PM polprog: the Big Ladder is behind all of this
03:20 PM polprog: soic18 thats good
03:20 PM Tom_L: one thing they did was to put a different one on each side of the pcb
03:21 PM polprog: never done doublesided
03:21 PM polprog: this is going to be etched maybe even this weekend
03:21 PM polprog: i need a dremel stand
03:21 PM polprog: thats why the nicad charger is going to be as much SMD as possible
03:21 PM polprog: i cant drill holes in a straight line for my life with this now
03:22 PM polprog: even when i prime them with a nail
03:39 PM polprog: what's a good trace width you use?
03:46 PM rue_mohr: I go as thick as I can
03:47 PM polprog: i have 20 mils (soic pad width)
03:47 PM rue_mohr: usually 25 thou iirc
03:47 PM rue_mohr: 20-50
03:47 PM polprog: maybe i could do 25
03:47 PM polprog: i could add pads for decoupling!
04:15 PM polprog: https://polprog.net/rozne1/ircjunk/various/breakouts.png
04:15 PM polprog: maybe i could fit an 0603 r2r ladder there
04:15 PM polprog: under the wide 14pin soic
04:27 PM aandrew: SOIC breakouts less important than TSSOP, SC70, etc. I can still reliably folder SOIC without help. :-)
04:28 PM aandrew: So I pulled the motor off my mill. Wtf is NEMA 229-C. It’s not C flange, and it’s rather wide. Going to have to get an adapter plate made
04:29 PM aandrew: By normal NEMA standards, 229 is 5.5” radius, and C is supposed to be C flange
04:30 PM polprog: i have some soic only ICs
04:30 PM polprog: some of them pulled from dead motherboards
04:30 PM polprog: incl the LM358 in smd that i wanna use in this project
04:32 PM aandrew: polprog: you’ve measured to make sure your side-to-side distance for the DIP rows is a multiple of 0.100”?
04:33 PM polprog: yep
04:33 PM polprog: https://polprog.net/rozne1/ircjunk/various/nicadchg2.png
04:36 PM aandrew: The stupid pulley on the motor is suedes on, I snapped an Allen key trying to undo one of the grub screws
04:36 PM aandrew: That might be fun to get off, alu pulley. Any danger to warping it if using a torch?
04:40 PM aandrew: Also picked up some glycerin at the grocery store on an impulse buy... thinking to make ultra strong bubbles for the kids when it warms up a little more
05:03 PM rue_shop1: aandrew, I suggest giving it a REALLY HEFTY squeeze one way
05:04 PM rue_shop1: then a firm squeeze at 90 degrees, it should fall right off
05:04 PM rue_shop1: I use a vise
05:04 PM rue_shop1: the first sqeeze distorts the aluminum into an elipse
05:04 PM rue_shop1: the second opens the elipse from the shaft
05:06 PM aandrew: I need to save the pulley
05:06 PM aandrew: So I may end up drilling out the grub screws
05:06 PM aandrew: May use a reverse drill bit
05:17 PM rue_shop2: k
05:17 PM rue_shop2: hmm
05:18 PM rue_shop2: I dont know if I did the diff from the 3d scanner on the pi or on my computer
05:18 PM rue_shop2: aha here is it
05:18 PM rue_shop2: diffs two jpegs
05:21 PM rue_shop2: pngs
05:21 PM rue_shop2: hmm
05:22 PM rue_shop2: oh interesting, I only proofed it
05:22 PM rue_shop2: hmmm
06:14 PM polprog: nite
08:25 PM rue_mohr: well, I guess I wont be tweeting for a while
08:25 PM Tom_L: ?
08:26 PM rue_mohr: DMCA against videos of "mine"
08:26 PM rue_mohr: tho, in their huge list, I saw 1
08:26 PM rue_mohr: all the rest seemed to be cuase I had tweets related to someone elses copyright content
08:27 PM rue_mohr: I was just comming up on 1024 followers too!
08:27 PM Tom_L: more time to buld stuff
08:28 PM rue_mohr: kinda
08:28 PM rue_mohr: iwas using twitter as motivation to get off my ass
08:28 PM rue_mohr: nice to get a bunch of comments or questions when you done something
08:28 PM Tom_L: yeah that motivates me too
08:29 PM rue_mohr: nice to be able to find interested people
08:29 PM Tom_L: been too idle to get much feedback though
08:29 PM rue_mohr: yea, irc was kinda dead, I was in one of the channels and noticed the twitter posts
08:30 PM rue_mohr: checked it out and decided it might be worth using to try to find more interested people
08:30 PM rue_mohr: and it worked
08:30 PM rue_mohr: tho, I only expected about 12 followers
08:30 PM Tom_L: yeah they're more rule followers
08:30 PM Tom_L: too mainstream
08:31 PM rue_mohr: it looks like the DMCA bots are just going crazy right now, I'll wait for it to settle down and try again
08:32 PM rue_mohr: ShopMoon, the thing is sandblasted by the way
08:33 PM rue_mohr: I was playing around with the editor to write some code
08:33 PM rue_mohr: seems its got a really strange memory leak/error
08:33 PM rue_mohr: so, I'll keep working on the new version with a new core
08:34 PM rue_mohr: chips arrived from china
08:34 PM rue_mohr: lots of fet drivers
08:34 PM rue_mohr: got some opto-isolated ones :)
08:35 PM rue_mohr: I'm trying to figure out "get-up-and-go"
08:35 PM rue_mohr: what the difference is between having it and not
08:35 PM Tom_L: mine got up and went
08:35 PM rue_mohr: yea
08:36 PM rue_mohr: and yet, sometimes, the tasks are really simple
08:36 PM rue_mohr: I was fighting agianst it all yesterday
08:36 PM Tom_L: i cleaned out the shop vac... does that count?
08:36 PM rue_mohr: "this needs to be welded, its really wasy"
08:36 PM Tom_L: i knew it'd be a mess
08:36 PM rue_mohr: "this needs to be welded, its really easy"
08:36 PM rue_mohr: took everything I had to put the welder out, set the pieces out and weld them
08:37 PM rue_mohr: none of it difficult
08:37 PM rue_mohr: not even any problems to solve
08:37 PM rue_mohr: just set up and weld A to B
08:37 PM rue_mohr: after which, my system dumped me with melitonin and I had to take a nap
08:38 PM rue_mohr: talk about wanting to just be a robot
08:38 PM Tom_L: change your diet
08:38 PM rue_mohr: I have, lots
08:38 PM rue_mohr: doesn't make a difference
08:39 PM rue_mohr: but there is a clear on/off thing in there
08:40 PM rue_mohr: get-up-and-go is either present, or not
08:40 PM rue_mohr: and its nothing to do with the task
08:42 PM rue_mohr: its almost like the energy to get the motion-generating part of the brain going just isn't there
08:42 PM Tom_L: i think my ballscrews might still be off
08:42 PM Tom_L: those circles i cut were undersize
08:43 PM Tom_L: not by much but still
08:43 PM Tom_L: i was gonna run a test block today but you see how far that got
08:43 PM rue_mohr: your sure the bit is on size?
08:43 PM Tom_L: it was brand new
08:43 PM Tom_L: yes
08:43 PM rue_mohr: I found out my 1/8" bit was down to like 2.89mm?
08:44 PM Tom_L: i'll check all the backlash nuts etc first
08:44 PM Tom_L: it wasn't critical on that but was a good test under load
08:44 PM rue_mohr: I might do somethiing interesting if I sit in the shop
08:45 PM Tom_L: it got cold overnite is partially why i did little
08:45 PM rue_mohr: if you want to test backlash, cut a wide -_-_
08:45 PM rue_mohr: continious path that goes back on itself
08:46 PM rue_mohr: measure the widths of them
08:46 PM rue_mohr: the lash is in a different direction each part
08:46 PM rue_mohr: so you can directly measure it
08:46 PM Tom_L: for one axis
08:46 PM rue_mohr: both
08:46 PM Tom_L: i'd have to run it twice
08:46 PM rue_mohr: nope, if you do that path,
08:46 PM rue_mohr: _|-|_|-
08:47 PM rue_mohr: bad ascii art
08:47 PM Tom_L: still only pushes in x
08:47 PM Tom_L: not push pull
08:47 PM Tom_L: y would be the test there
08:48 PM rue_mohr: arg
08:48 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150715.jpg
08:48 PM rue_mohr: xy path like that!
08:49 PM rue_mohr: hmm, I cant remember if that works out better as a single path that doesn't double back
08:49 PM rue_mohr: no, pretty sure it has to double back
08:50 PM Tom_L: circle is a pretty good test
08:50 PM rue_mohr: hard to interpret
08:50 PM Tom_L: you can see the dimple at the quadrants
08:50 PM Tom_L: and how big it is
08:50 PM Tom_L: and it will either be round or egg shape
08:57 PM Tom_L: i may try both when i get motivated
08:58 PM rue_mohr: that thing I did you can directly measure
08:59 PM rue_mohr: I dont know how to measure the backlash from a cut circle
09:01 PM Tom_L: i don't think backlash is the problem but i'll start with it just to be sure
09:01 PM Tom_L: it's still much better than it was
09:19 PM Tom_L: i suppose .500 squares would be big enough
10:45 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/test_squares.jpg
11:09 PM rue_mohr: yea, give it a go!
11:09 PM Tom_L: maybe tomorrow
11:10 PM rue_mohr: measure the n and then the U, the difference is the backlash
11:10 PM rue_mohr: *2
11:10 PM rue_mohr: iirc
11:10 PM rue_mohr: cool I saw a trick in a book for a constant current source and it works
11:10 PM rue_mohr: sloppy, but yea
11:37 PM Tom_L: sure hope i remember to test that before i run a program.. changed my post template a bit
11:39 PM Tom_L: it was tweaked where i didn't have to touch the output but i'm making minor suttle mods now