#garfield Logs

Jul 18 2020

07:06 AM Tom_L: rue_mohr, sounds like it's not far from working now
11:58 AM rue_mohr: https://twitter.com/_Towble/status/1284526448514969600/photo/1
02:34 PM polprog: https://i.ibb.co/BHJQKgM/IMG-20200718-133029.jpg
02:34 PM polprog: new meter
02:36 PM polprog: :^)
02:36 PM polprog: gotta renovate the case
03:12 PM rue_mohr: oo
03:12 PM rue_mohr: upside down just feels wrong...
03:13 PM rue_mohr: using a 555 for the smps is being a pain
03:13 PM rue_mohr: gonna break for a bit
03:58 PM polprog: im going thru the PAL tv modules i bought
03:58 PM polprog: there are two delay lines (4560ns)
03:58 PM polprog: suddenly
03:58 PM polprog: SDA3302
03:59 PM polprog: GHz PLL withI2C Busand Four Chip Addresses
03:59 PM polprog: 16-1300MHz
03:59 PM polprog: :o
04:01 PM polprog: more delay lines
04:01 PM polprog: some eeproms
04:01 PM rue_mohr: :)
04:01 PM rue_mohr: whats the board? the video converter?
04:07 PM polprog: lots of stuff from old TVs
04:07 PM polprog: tda4510 PAL decoder
04:11 PM polprog: low power sram.. teletext slicer
04:14 PM polprog: some jungle teletext IC with a memory bus and a char gen
04:14 PM polprog: i wonder if i can use it as a quick and dirty text graphic IO module
04:14 PM rue_mohr: nice
04:14 PM polprog: loads of delay lines and some uv eproms
04:14 PM rue_mohr: maybe there is enought o make a text terminal
04:14 PM polprog: :P
04:14 PM rue_mohr: nic
04:15 PM rue_mohr: e
04:15 PM polprog: that would be cool
04:15 PM polprog: shame im out for vacation soon
04:15 PM polprog: no lab :(
04:15 PM polprog: hmm, the delay line is 560ns
04:15 PM polprog: delay line memory :P?
04:15 PM rue_mohr: bit hard with 560ns
04:37 PM polprog: in theory if i could fake some ttx data i would be able to make this a poor mans video terminal
05:11 PM polprog: hmm, got some 64us lines as well
05:11 PM polprog: hmm, delay lineoscillator?
05:12 PM rue_shop1: yea you could
05:12 PM rue_shop1: 445kHz?
05:13 PM polprog: not bad
05:13 PM polprog: the 440ns gives off some very high amplitude signal
05:13 PM polprog: almost as high as the input
09:16 PM rue_mohr: shopping list: Everything.
09:16 PM rue_mohr: (I have to go shopping...)
09:19 PM aandrew: rue_mohr: yeah today was a “holy shit I need everything” grocery shopping day
09:35 PM rue_mohr: trying to make sure I'v thought of everything before I go
11:00 PM rue_mohr: zhanx_, Tom_L I got borred, ...
11:00 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1160660.jpg
11:00 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1160662.jpg
11:00 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1160663.jpg
11:00 PM rue_mohr: I have lots of things I should do doing mind ya
11:01 PM Tom_L: but you chose that
11:01 PM Tom_L: sitting here trying to figure out my gear macro
11:02 PM rue_mohr: I know...
11:02 PM rue_mohr: so, no hashbrowns and wieners for supper tonight
11:02 PM Tom_L: i need some good numbers for a gear so i can see if it works
11:02 PM rue_mohr: maybe a bag of skittles....
11:02 PM Tom_L: so you didn't shop
11:02 PM rue_mohr: no
11:03 PM rue_mohr: I can get the pitch diameter by taking two matching gears and dividing the distnace from the centers by two
11:03 PM rue_mohr: but all the gears I have are either uniquie or have a really fine pitch
11:04 PM Tom_L: i need pd, teeth, pitch
11:04 PM Tom_L: at least
11:04 PM rue_mohr: how small a bit do you want to keep it to?
11:04 PM Tom_L: i don't care, it's a test
11:05 PM Tom_L: to see how well the macro works
11:05 PM rue_mohr: Ican give ya some numbers, but they wont be usefull to try to make anything
11:06 PM Tom_L: they gotta be better than guessing
11:06 PM rue_mohr: so I can get the pitch radius (dia)
11:06 PM rue_mohr: and if I can make a centre, I can score a line and get a pitch
11:06 PM rue_mohr: whats pd?
11:07 PM rue_mohr: oh right ok
11:07 PM rue_mohr: well let me see
11:07 PM rue_mohr: no milk for tea
11:07 PM rue_mohr: *sigh*
11:10 PM Tom_L: i ran it in demo mode and it's taking forever now
11:10 PM Tom_L: shouldn't have done that
11:11 PM rue_shop1: right ok
11:11 PM rue_shop1: so
11:11 PM rue_shop1: 2 gears
11:13 PM rue_shop1: the shaft hole is 8mm
11:13 PM rue_shop1: >O< = 8
11:14 PM rue_shop1: O<-->O distance from inside to inside (two gears) is 74mm
11:14 PM Tom_L: pitch diameter?
11:14 PM Tom_L: inch
11:14 PM rue_shop1: so the pitch dia is 82mm
11:15 PM Tom_L: 3.22
11:15 PM Tom_L: how many teeth?
11:18 PM rue_shop1: 82
11:19 PM rue_shop1: it looks like the pitch is about 3.2mm?
11:19 PM rue_shop1: hard to measure that one
11:19 PM Tom_L: something isn't right
11:19 PM rue_shop1: how so
11:20 PM Tom_L: lemme step thru it
11:20 PM Tom_L: 20 deg pressure angle
11:20 PM Tom_L: pitch diameter 3.2283
11:20 PM Tom_L: number of teeth 82
11:21 PM Tom_L: it's asking for backlash
11:21 PM rue_shop1: 0
11:21 PM Tom_L: not sure why or what that's for
11:21 PM rue_shop1: overcut
11:21 PM Tom_L: it doesn't like 0
11:21 PM rue_shop1: 0.00001
11:23 PM Tom_L: i think something is wrong with the macro
11:23 PM rue_shop1: ok
11:23 PM Tom_L: i thought i'd used it before
11:24 PM Tom_L: the tooth is coming out too big for the root diameter
11:24 PM Tom_L: they're too close together at the base
11:24 PM Tom_L: the form looks ok
11:28 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/gear1.jpg
11:28 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/gear2.jpg
11:28 PM Tom_L: i dunno
11:29 PM rue_mohr: nope]\
11:29 PM Tom_L: i didn't write that one
11:29 PM Tom_L: i did do one for sprockets though
11:31 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1160665.jpg
11:31 PM rue_mohr: ?
11:31 PM Tom_L: i know
11:31 PM rue_mohr: or is it?
11:32 PM rue_mohr: the OD is out
11:32 PM Tom_L: the top of the tooth should fit the bottom of the groove
11:32 PM Tom_L: pd is halfway between those
11:33 PM Tom_L: not sure how pitch diameter differs from diametral pitch
11:33 PM rue_mohr: see the scratch on the upper right teeth (3 of them)
11:33 PM rue_mohr: thats the pd
11:33 PM Tom_L: yeah i know where it's located
11:34 PM rue_mohr: but in that picture, thats where it is
11:34 PM Tom_L: yeah
11:34 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1160665.jpg
11:34 PM rue_mohr: ?
11:34 PM rue_mohr: its not half way
11:34 PM Tom_L: https://www.engineersedge.com/gears/involute-gear-design.htm
11:35 PM rue_mohr: sure, but I'm saying, "real gear"
11:35 PM rue_mohr: not school gear
11:36 PM Tom_L: that's where real gears come from though
11:36 PM rue_mohr: I have a large book I printed to write a program to make gears
11:36 PM rue_mohr: then I just bought the program from woodgears.ca
11:36 PM Tom_L: i think the math is off on the macro somewhere
11:36 PM rue_mohr: instead
11:37 PM Tom_L: i won't use the macro i just wanted to see if it worked
11:37 PM Tom_L: if i ever do make any gears it will be with an index head and gear cutters
11:37 PM rue_mohr: I see horrid things in the reprap world
11:37 PM Tom_L: not an endmill
11:37 PM rue_mohr: people using sine waves
11:37 PM Tom_L: i bet
11:38 PM Tom_L: gear cutters aren't quite as accurate as a gear hob but they're a calculated average
11:38 PM Tom_L: that's why they come in sets of 8
11:39 PM Tom_L: a #1 looks vastly different than a #8
11:40 PM Tom_L: because of the pitch diameter
11:40 PM rue_mohr: whats your take on aluminum cookware?
11:40 PM Tom_L: coated is ok
11:41 PM rue_mohr: :/
11:41 PM Tom_L: non stick
11:42 PM Tom_L: i got her some that's not teflon but some really hard coating that are decent
11:42 PM Tom_L: bare aluminum i'm not sure of
11:43 PM Tom_L: mostly stainless and that coated is what we've got
11:45 PM Tom_L: https://www.thecookwareadvisor.com/what-everyone-needs-to-know-about-aluminum-cookware/
11:45 PM Tom_L: it leeches off with acidic food
11:45 PM Tom_L: that's why most of it is coated somehow
11:48 PM Tom_L: the short answer is no, don't use plain aluminum cookware