#linuxcnc-devel | Logs for 2019-02-28
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[10:59:39] <JT-Shop> pcw_home: hows the 7i77's 76 etc coming along?
[11:02:14] <pcw_home> Yeah but we've overloaded our assy house again >2000 cards being assembled
[11:02:50] <pcw_home> unfortunately ran out of many cards at the same time
[11:03:59] <JT-Shop> ok just wondering
[11:04:24] <JT-Shop> what does the assy house do? just curious
[11:04:58] <pcw_home> solders the parts on
[11:06:02] <JT-Shop> ok, so one place makes the boards and another place assembles them?
[11:06:48] <pcw_home> Yes we get the PCBs from one source then send the PCBs and parts to the assy house. They first screen print the solder on the cards
[11:07:17] <JT-Shop> cool
[11:07:41] <pcw_home> then place the components in the solder paste and run the PCBs with solder+parts through a oven
[11:09:11] <pcw_home> 2000 boards *~100 parts/board so 200,000 parts placed
[11:09:48] <JT-Shop> wow
[11:10:16] <pcw_home> so takes a while with the rather small assy house we use
[11:10:18] <JT-Shop> I've seen a pick and place and reflow (I think you call it that) oven once
[11:10:32] <pcw_home> yes reflow is the word i forgot
[11:11:25] <pcw_home> Ive been doing protos with low temp solder paste and its _really_ nice
[11:12:26] <pcw_home> you can reflow with a hot air gun on the back of the PCB with no danger of overheating anything
[11:13:14] <pcw_home> ( low temp = 138 C MP ) not good for power (hot) electronics but fine otherwise
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[11:15:22] <JT-Shop> pretty cool
[11:16:33] <pcw_home> Yeah its really easy if you have the solder stencil (really just takes the stencil and a squeegee to screen on the paste)
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[11:17:34] <skunkworks> There is a guy on youtube that fixes macbooks.. He is amazing with a hot air gun...
[11:19:32] <pcw_home> Yeah, I think I've seen him (louis something?) I have a rework setup, but with low temp solder a crufty old Grainger hot air gun is fine
[11:19:56] <skunkworks> yes
[11:23:35] <skunkworks> I got a tour of ibm's factory in eau claire wi. (iirc) They were making motherboards there.. It may have been their prototyping factory - I don't remember. but at the time they were having problems with the high density through hole processor sockets bridging solder.
[11:25:58] <skunkworks> when the wave soldered them
[11:29:52] <pcw_home> Yeah solder bridging is an issue with wave soldering as you get denser
[11:30:43] <skunkworks> this was early 90's
[11:31:12] <pcw_home> Our assy house has a weird system for through hole soldering that does one joint at a time
[11:31:46] <skunkworks> like a robot solding iron?
[11:32:09] <pcw_home> tiny solder pot and robot
[11:32:24] <pcw_home> (and vision system)
[11:33:25] <pcw_home> less thermal stress, works with double sided SMT etc (but slow of course)
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