whitequark | haha, so, remember my faulty CNC thing? | 02:13 |
---|---|---|
whitequark | someone else also bought it without all the autotransformer fuss, and it blew in almost exactly same way | 02:13 |
whitequark | http://orionrobots.github.io/CnCNotes/2014/04/13/diagnosing-the-cause.html | 02:13 |
whitequark | fet instead of 555 died | 02:13 |
whitequark | so it's not me, it's the chinese | 02:13 |
DocScrutinizer05 | sure, what else :) | 02:20 |
wpwrak | whitequark: you could start a CNC preemptive repair service :) team up with an importer and reseller, then fix the critters before selling them | 05:01 |
whitequark | mmm | 05:10 |
whitequark | i'm not sure it's worth the hassle | 05:10 |
wpwrak | you mean that most of the critters don't fail ? or that people wouldn't pay for a - probably still comparably cheap - device that doesn't go up in flames ? | 05:22 |
whitequark | i mean it's a lot of work | 05:23 |
whitequark | logistics, agreements with suppliers, marketing... | 05:24 |
wpwrak | maybe look if there's any large reseller in .eu, then contact them to see if they think that's a problem they'd like to have solved | 05:28 |
whitequark | I think there aren't any resellers, they just ship directly from China | 05:30 |
whitequark | why let someone else take a cut if you can sell it directly on ebay? | 05:30 |
whitequark | hm, there are some resellers, it seems | 05:31 |
whitequark | holy fuck | 05:32 |
whitequark | a russian reseller sells it for over 5x the price i bought it at | 05:32 |
wpwrak | does that smell like opportunity ? :) | 05:36 |
whitequark | hmm | 05:38 |
whitequark | well, it does | 05:39 |
whitequark | toolmaking is a pretty high-margin field in general | 05:39 |
wpwrak | take cheap but dodgy china stuff, add indestructible russian engineering, own the world :) | 05:59 |
whitequark | o! http://www.ebay.com/itm/271304987728 | 06:04 |
whitequark | they're enormous though, with OD=0.9 | 06:05 |
whitequark | http://www.ebay.com/itm/271138757893 these are with OD=0.6 | 06:06 |
whitequark | pretty interesting actually | 06:06 |
wpwrak | cheaper here: http://www.rembrandtlights.com/shop/re-1050 | 06:21 |
whitequark | it's exactly same company | 06:22 |
whitequark | they even link from ebay footer | 06:22 |
wpwrak | yup. that's what's funny about it, isn't it ? :) | 06:22 |
whitequark | I guess | 06:22 |
wpwrak | well, that's the first 6% discount. for the remaining 89% you have to find their chinese fab ;-) | 06:23 |
whitequark | http://www.aliexpress.com/item/100pcs-PCB-Brass-Rivets-Electronic-Prototype-0-9-mm-x-3-0-mm-Free-shipping/2052610864.html | 06:24 |
whitequark | 100pcs for $4.5 | 06:24 |
wpwrak | alas, only a single length. so it's not so nice for 0.8 mm boards | 06:24 |
wpwrak | now we're talking :) | 06:24 |
whitequark | wow, 1000 for $10 | 06:25 |
whitequark | these things really aren't expensive to produce, are they | 06:25 |
whitequark | it's basically packaging cost | 06:25 |
wpwrak | and margin :) | 06:26 |
whitequark | you'd need a microscope to see that margin | 06:26 |
wpwrak | not if you sell at 10 cents per unit :) | 06:27 |
whitequark | hehe | 06:28 |
wpwrak | hmm, aliexpress doesn't seem to have stuff < 0.9 mm, which probably is the shaft diameter | 06:34 |
whitequark | yeah, it's ID | 06:36 |
wpwrak | hmm, or just use nails: http://www.mill-max.com/assets/pdfs/204.pdf | 06:38 |
wpwrak | of course, mill-max are triple-plus $$$ | 06:39 |
whitequark | huuuh | 06:40 |
whitequark | do you solder these, or smash? | 06:40 |
wpwrak | i'd solder them. but feel free to smash ;-) | 06:41 |
mooseboobs | Anyone know where I could find an example pcb layout for a smartphone (preferably with a MTK chipset) ? | 15:49 |
DocScrutinizer05 | smashing rivets into PCB is a nasty thing and tends to not yield good results | 16:20 |
DocScrutinizer05 | may sound weird but the FR4/whatever is too brittle and neither elastic nor strong enough | 16:21 |
DocScrutinizer05 | and you generally damage copper plating in 75% of cases | 16:22 |
DocScrutinizer05 | you'll end up with rivets that are loose and don't have contact despite looking perfect | 16:23 |
DocScrutinizer05 | depending on your tools to smash the rivets, you even may deform the PCB so it is a 1.2mm at and around the rivet when it originally been 0.8mm | 16:24 |
DocScrutinizer05 | some methods to smash rivets make the rivet create enormous forces radially to rivet's cylinder | 16:26 |
wpwrak | so, better to use nails, and no hammer | 16:59 |
apelete | Hi larsc | 19:14 |
apelete | are you there ? | 19:14 |
whitequark | DocScrutinizer05: I see | 22:24 |
whitequark | rivets did look fishy to me, there should have been a reason almost no one ever uses those | 22:24 |
--- Wed Nov 12 2014 | 00:00 |
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