<wpwrak>
what would a perpendicular cut look like ?
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<wpwrak>
and i wonder whether your clamps really hold it well enough. better: make a "bridge" where each clamp has two screws. you already made nice holes for just that ... :)
<whitequark>
that wouldn't really work well with arbitrarily sized material
<whitequark>
(well enough) I can't feel any movement when jerking workpiece with my hands as hard as I can
<wpwrak>
let's worry about that later :)
<whitequark>
I'd rather move the whole machine than workpiece against table
<whitequark>
unlike my previous setup with masking tape & etc
<wpwrak>
hmm
<wpwrak>
how about movement along the Z axis ? can you move the end that's far from the screws ?
<whitequark>
how does this thing even happen? LCD driver gone completely mad?
<eintopf>
crazy
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<whitequark>
ohhh crap
<whitequark>
I forgout about it being blue
<whitequark>
meaning there's more than just water in solution; there's also captured water coordinated together with salt, giving it its blue color, characteristic for H2O complexes of copper
<whitequark>
and that water boils no worse than the regular one
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<whitequark>
wow, seems wpwrak was right
<whitequark>
if I *slowly* heat up copper hypophosphite, it produces some kind of gold film on surface
<whitequark>
still needs more work. but, the direction is right.
<whitequark>
perhaps a bath with more carefully set pH and pCl¯ would work better.
<wpwrak>
does the copper rub off ?
<whitequark>
rub off? you mean like by fingers?
<whitequark>
no, this time it's as strong as factory-plated copper
<wpwrak>
great !
<whitequark>
in fact I was curious and inserted an 1.0mm endmill used to drill those holes and turned it a few times inside
<whitequark>
the copper is still there, now just more shiny
* whitequark
*really* likes the color of freshly plated copper
<whitequark>
oh by the way, it also solders really well
<whitequark>
even without tinning!
<wpwrak>
hmm, with that huge unbroken copper surface ? that should be nearly impossible to solder
<wpwrak>
well, unlesss you preheat the board
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<whitequark>
wpwrak: nah, not very hard
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<nicksydney>
wpwrak: completed KL25Z bootloader upgrade ..now can flash from Linux
<nicksydney>
wpwrak: are you able to use the serial from the SDA usb ?
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<nicksydney>
ok found the serial looks like mine is called /dev/ttyACM0
<nicksydney>
got the sample code from here https://github.com/payne92/bare-metal-arm and the makefile covers everything from downloading the gcc to compiling and flashing..very convenient
<wpwrak>
whitequark: perhaps i shouldn't ask about your soldering iron then :) does it even need electricity or does it come with an ex military power source with a "lifetime guarantee" ?
<wpwrak>
nicksydney: congratulations. ah, it has serial ? never tried ;-)
<wpwrak>
yes, bare-metal-arm is very very convenient :)
<nicksydney>
wpwrak: yes it has serial...the sample from that github shows the accelerometer and touch values
<whitequark>
wpwrak: a 30W iron I believe
<nicksydney>
the serial is in the SDA USB
<wpwrak>
ah, right. now i remember. briefly used it as well.
<nicksydney>
ok time to hit the bed
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<whitequark>
wpwrak: very fascinating
<whitequark>
since I stopped using NaOH for preparing copper surface and instead use isopropanol+5second etch, persulphate started to work really well
<whitequark>
seems I inadvertently passivated it
<whitequark>
also, when persulphate works well, it emits a *ton* of SO2. I wanna a fume hood
<whitequark>
*cough*
<whitequark>
pretty good irritant
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<whitequark>
grmbl. 1 via out of 7 actually survived etching
<whitequark>
I need better electrodes and better alignment of negative...
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<wpwrak>
i wonder what the industrial sequence for etching, plating, and drilling is
<wpwrak>
hmm ... "Conventional through-hole processing usually relies on 3 or more baths to prepare the hole walls for copper plating."
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<DocScrutinizer05>
I mean, how much of that stuff will get used by a thru-hole/via wall coted by a 0.005mm thick coating of that stuff? 50g will last a loooong way, I guess
<DocScrutinizer05>
wpwrak: prolly that magic pixie dust is worth each penny
<wpwrak>
dunno. i found the 3 baths intriguing.
<DocScrutinizer05>
not because of the "three kinds of carbon", not even because of the silver it contains, but merely because of the adhesive
<DocScrutinizer05>
will get a tad nasty for in-pad vias
<DocScrutinizer05>
but then, when you need in-pad vias, you also need 6 layers at very least
<DocScrutinizer05>
so this seems to be a non-issue for all that matters
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<DocScrutinizer05>
actually I wonder if simple conductive ink to fill the complete via hole wouldn't over-accomplish the task we're discussing here, which seems to simply be: connect top and bottom copper layer traces of a 2-sided PCB
<DocScrutinizer05>
sure, won't result in proper thermal vias, but hey
<DocScrutinizer05>
for proper thermal vias you're probably better off with copper rivets anyway, even when comparing to via plating
<DocScrutinizer05>
o.O
<DocScrutinizer05>
seems I need a break - I just thought about dentists and amalgam filler
<DocScrutinizer05>
FSCK RoHS! ;-P
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<wpwrak>
i'm just waiting for the first exploding wire experiments :)
<DocScrutinizer05>
oooh, those been done ~30 to 40 years ago
<DocScrutinizer05>
pretty funny. Particularly when coating glass. It's amazing how strong it sticks to the glass
<DocScrutinizer05>
;-)
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<DocScrutinizer05>
actually for such experiments unfiltered 220V mains is the most adequate power source. You should maybe use a fast 10A protective breaker
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<DocScrutinizer05>
not that it usually would kick in, just in case you mess up stuff
<DocScrutinizer05>
finding the right switch for such stuff is quite an interesting task. You want it to be very fast on closing, with low ESR and no bouncing
<DocScrutinizer05>
surge killers are probably best for that task. the small ones with axial wires and a glass thingie of ~10mm diameter and 5mm height in the middle
<DocScrutinizer05>
trigger that critter with a spark of some kV, e.g. from car ignition
<DocScrutinizer05>
of course you rather want to use one for 110V rather than 220V, so it doesn't cut out immediately after the spark from ignition ended
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