#garfield Logs

Feb 06 2022

06:35 AM Tom_L: morning
08:09 AM polprog: morning
11:05 AM rue_bed: still not solved li-ion to 3.3V
11:06 AM Tom_L: https://www.ebay.com/itm/154405920881
11:06 AM Tom_L: early ssd?
11:06 AM Tom_L: what v is li ion?
11:07 AM rue_bed: disk chip wasn't ssd...
11:07 AM rue_bed: as we know it
11:07 AM Tom_L: oh
11:07 AM rue_bed: Tom_L, 4.2 to 3 as I understand
11:07 AM Tom_L: 1 diode won't do it?
11:07 AM rue_bed: I got a converter going, but 44% eff
11:07 AM rue_bed: I'd like somehting regulated
11:08 AM Tom_L: drop out is gonna be more than that on most regs
11:08 AM rue_bed: yea, I'm playing with buckboost switching methods
11:08 AM rue_bed: discovered/learned a few good ones last night
11:09 AM rue_bed: the disk chip is probably an eprom
11:09 AM rue_bed: I wonder if its 128Mbits or bytes
11:12 AM rue_bed: clipboards, hakko 907, fix paint sprayers, prep tubes for new order
11:13 AM rue_bed: they ordered 9 more yesterday
11:13 AM Tom_L: prep tubes?
11:13 AM Tom_L: oh
11:13 AM rue_bed: the tubes for hte body of the paint sprayers
11:14 AM rue_bed: cut, face, route, slot
11:14 AM rue_bed: we might have some already made up
11:14 AM Tom_L: you have 3 lengths?
11:14 AM rue_bed: its custom past 6 inches
11:15 AM rue_bed: they asked for 12" 16" and 18"
11:15 AM Tom_L: those should cost more then :)
11:15 AM rue_bed: it all evens out
11:15 AM rue_bed: I think our costing is based on 18"
11:16 AM rue_bed: they order lots of 3"
11:16 AM Tom_L: maybe you should come up with an aluminum handle for the extra long ones
11:16 AM rue_bed: we did a cost check a bit ago with the huge hike in prices and were still ok
11:16 AM Tom_L: seems to put a strain on them if it gets too long
11:16 AM rue_bed: I want to try that roll casting
11:17 AM Tom_L: they'd need to be pretty smooth
11:17 AM rue_bed: see if I can do hollow castings
11:17 AM Tom_L: i think the alum would cool too quick on a thin part
11:18 AM rue_bed: think it would warp?
11:18 AM Tom_L: dunno
11:18 AM Tom_L: use sand casting for that?
11:18 AM Tom_L: the sand might not stay in place
11:19 AM rue_bed: oh the sand is pretty good!
11:22 AM Tom_L: would it be the same handle as the plastic one or thicker?
11:24 AM rue_bed: maybe the same
11:24 AM rue_bed: might make it a bit wider
11:24 AM rue_bed: round it off more
11:24 AM Tom_L: would hardly be worth making it hollow if it's the same
11:24 AM rue_bed: weight
11:24 AM rue_bed: they dont want them heavy
11:24 AM Tom_L: they don't want them to fail either
11:25 AM Tom_L: the weight on that end is less important than on the other end
11:26 AM Tom_L: you have a good supply source for the tube?
11:34 AM rue_bed: metal shop in vancouver
11:35 AM rue_bed: but of fun to get them cause they are default 20 foot lengths
11:35 AM rue_bed: so we get them with a cut fee :/
11:35 AM Tom_L: tie them to the top?
11:35 AM rue_bed: no we get them shipped
11:35 AM Tom_L: oh
11:35 AM rue_bed: the ferry is ~$100
11:35 AM Tom_L: what's the cut fee?
11:35 AM Tom_L: damn
11:36 AM Tom_L: glad i live here...
11:36 AM rue_bed: dont recall, not too bad
11:36 AM rue_bed: hah
11:36 AM rue_bed: its that much for a car
11:36 AM rue_bed: its about 20 for walk-on
11:36 AM Tom_L: still...
11:36 AM rue_bed: yea
11:36 AM rue_bed: keeps the population here from going up too fast
11:36 AM Tom_L: leave the car and walk over to get the pipe
11:36 AM Tom_L: i bet
11:36 AM rue_bed: heh
11:37 AM rue_bed: they might be annoyed if I try to transport it on the bus
11:37 AM rue_bed: "I WAS TOLD THIS WOULD BE A 40' BUS!!!"
11:38 AM rue_bed: "NO, AN ARTICULATED BUS WILL _NOT_ WORK FOR ME!!!"
11:38 AM rue_bed: "I WANT MY $2 BACK!!!"
11:39 AM rue_bed: HUH
11:40 AM rue_bed: when I made my soldering station
11:40 AM rue_bed: I based it on a Hakko 957
11:40 AM rue_bed: turns out those are now the hard pens to get
11:40 AM rue_bed: I got a tip stuck on one
11:41 AM rue_bed: I found one for $6, but most are $20+, which is annoying
11:41 AM rue_bed: they were almost free at the time
11:42 AM rue_bed: oh drat, I need to get more breakfast stuff
11:42 AM rue_bed: ok, clipboards and breakfast stuff
11:43 AM Tom_L: tea
11:43 AM rue_bed: got lots
11:44 AM Tom_L: milk
11:46 AM rue_bed: probably a good idea
11:46 AM rue_bed: I hate utility day, I want to play
11:47 AM rue_bed: so, After overhearing a conversation I think I know the difference from china
11:47 AM rue_bed: in north america, prices are often just driven up to "what the market will bear"
11:47 AM rue_bed: where china sells stuff for the money it cost
11:48 AM rue_bed: I was listening to a conversation at a large chain about how the pricing system worked
11:48 AM rue_bed: a trainee
11:48 AM rue_bed: while I was doing a fire inspection
11:51 AM Tom_L: huh
11:52 AM rue_bed: https://www.aliexpress.com/item/4000159966803.html
11:52 AM rue_bed: huh
11:52 AM rue_bed: its 3d printed
11:53 AM rue_bed: but it looks like thats all copper and shipping
11:54 AM Tom_L: get some buss bars and make your own
11:55 AM Tom_L: the springs are for the contacts?
11:56 AM rue_bed: china loves to sell open source stuff
11:56 AM rue_bed: https://www.thingiverse.com/thing:3070927
11:56 AM Tom_L: i don't quite get all the screws in the end
11:57 AM rue_bed: the welding cables attach to the back
11:57 AM Tom_L: heh
11:57 AM rue_bed: the tip is all holding the probes
11:57 AM rue_bed: springs help ensure you have good pressure
11:58 AM Tom_L: there must be a cable between the 2 pairs of buss bars
11:58 AM rue_bed: when you press it down far enough, you hit the microswitch to trigger the welder
11:58 AM Tom_L: for the springs to work
11:58 AM Tom_L: huh
11:58 AM rue_bed: the springs just help make sure you have pressure on the tips
11:58 AM Tom_L: so the whole buss bar slides
11:59 AM rue_bed: yup
11:59 AM Tom_L: pretty simple to make
11:59 AM rue_bed: yup
11:59 AM rue_bed: so, do I just buy one?
11:59 AM Tom_L: you can probably get the copper fairly easy
11:59 AM rue_bed: haha
12:00 PM Tom_L: no you need one more project!
12:01 PM Tom_L: does the switch take the full current or just trigger a relay or such?
12:02 PM Tom_L: like a mig wand switch
12:02 PM rue_bed: I trigger a microwave transfomer thats rewound
12:02 PM rue_bed: should be about 300A shorted
12:03 PM Tom_L: has about 3 big coils?
12:03 PM rue_bed: so a timer just hits it for a few ms
12:03 PM rue_bed: yup
12:03 PM rue_bed: works great
12:03 PM Tom_L: what voltage drop is that?
12:03 PM Tom_L: current boost?
12:03 PM rue_bed: (till the day the SSR screws up on me and locks on)
12:03 PM Tom_L: :)
12:03 PM Tom_L: put a big fuse in it
12:03 PM rue_bed: dont recall the open voltage, I think about 3V
12:04 PM rue_bed: yea, I think I put a 15 or 20A
12:06 PM Tom_L: do they typically fail to short?
12:06 PM rue_mohr: I'v seen a lot of shorted SSRs in my travels
12:15 PM Tom_L: so you just unwind the secondary and replace it with 3-4 turns of #4 or 6 copper?
12:15 PM Tom_L: do you have to rectify it?
12:16 PM Tom_L: or leave it AC
12:16 PM rue_mohr: hah, I used 2/0 iirc
12:16 PM rue_mohr: just left it AC
12:16 PM Tom_L: it was fairly fat wire...
12:17 PM rue_mohr: yea, I kinda over did it
12:17 PM Tom_L: what did you use for cables to the wand?
12:18 PM rue_mohr: its cabtire wire
12:18 PM rue_mohr: a scrap from work
12:18 PM rue_mohr: fine strand, rubbery jacket
12:18 PM Tom_L: welding cable basically..
12:19 PM rue_mohr: yea, jacket is not as rugged
07:26 PM rue_mohr: ok
07:26 PM rue_mohr: 9 tubes cut, faced to length, routed, slotted and marked for corner trimming
07:26 PM rue_mohr: ugh
07:26 PM rue_mohr: laundy is all walked thru the mahines
07:31 PM Tom_L: waiting on the folder?
07:38 PM rue_mohr: folder?
07:39 PM rue_mohr: I have to fix a bunch of the other sprayers
07:39 PM rue_mohr: I have to reassess them and I'm out of energy
07:54 PM Tom_L: why?
07:55 PM Tom_L: busy day?
07:56 PM rue_mohr: went shopping and thigns too
07:56 PM rue_mohr: got more clipboards, they didn't have wood ones, their cardboard now, for $1.50...
08:00 PM Tom_L: :/
09:31 PM rue_mohr: 2301
09:31 PM rue_mohr: it looks like there is another burst
09:32 PM rue_mohr: I think I get a burst after being quiet a while and then posting again