Electronics Forum | Sat Mar 01 08:21:04 EST 2003 | davef
There are some fairly painless bare board fabrication methods that you can do in-house. Their main benefit is speed of respnse and schedule control. Profitability would depend on loading, marketing, and stuff like that.
Electronics Forum | Wed Jul 22 08:52:29 EDT 2009 | spitkis2
Can someone clarify whether IPC-TM-650 Test Method 2.6.27 (Thermal Stress, Convection Reflow Assembly Simultation) is required for all bare board fabricators? Or is this test method optional, depending on the type or class of boards being fabricated
Electronics Forum | Mon Aug 21 23:10:22 EDT 2006 | cpliew
How does it effect the fabricators' manufacturing yields and efficiencies? And reliability of the fabricated PCB?
Electronics Forum | Thu Oct 14 23:01:48 EDT 1999 | Dennis O'Donnell
With loaded boards, warpage can be removed by placing the assembly in a wave solder conveyor pallet as you would if you were going to wave solder the assembly. Place board and fixture in a Blue M forced air oven at 90 C for 30 minutes. Let cool to r
Electronics Forum | Fri Oct 12 09:54:44 EDT 2012 | proy
Attached is an image of PCB fabricators logo Can anyone identify the fabricator from this, I beleive it is a North American board, assembled in the Austin Tx area.
Electronics Forum | Fri Aug 30 16:25:21 EDT 2002 | davef
Imm silver holds-up to multiple thermal cycles very well. The things, we guess, are happening to make imm silver tough to solder after heating and sitting are: * Oxidation of the silver. * Reduction of the co-deposited organic anti-tarnish [used in
Electronics Forum | Mon Jan 28 19:58:58 EST 2002 | davef
Well, reflow certainly would increase your preheat, wouldn�t it? On the other hand, some PTH [and SMT] components cannot bear the heat of a reflow oven. Some boards will never see proper barrel fill, because of either: * Design of the board. * Sl
Electronics Forum | Sun Feb 23 15:20:26 EST 2003 | davef
We section no bare boards at incoming. If we have a problem that needs investigation, our suppliers do the sectioning for us. If we didn't trust their analysis, we'd: * Get a new supplier. [There is tons of capacity in this industry.] * Use an ind
Electronics Forum | Tue Nov 09 16:24:53 EST 2004 | davef
Your board fabricator is: * Correct that +-20% is the tolerance of the IPC specification * A moroon for not correcting the artwork to compensate for etch factors Find a new supplier. Baring that, if the SMT pad width is critical, you can specify th
Electronics Forum | Sat May 09 09:00:54 EDT 2009 | davef
For more on using tin as a resist during bare board fabrication, read "2.5.6 Introduction To Tin And Tin/Lead Plating" here: http://books.google.com/books?id=etfNcpiR5ZUC&pg=PT570&lpg=PT570&dq=%22circuit+board%22+%22etch+resist%22+%22acid+sulfate%22&
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