Electronics Forum | Tue Jun 05 22:59:18 EDT 2007 | davef
There is no standard. Companies select a lower control limit based on the desired cleanliness. Guidelines to consider are: * With fresh resin beds, expect get 17.5 mohm-cm water into the final rinse and then it decreases from there. * Semiconducto
Electronics Forum | Tue Jun 05 14:04:11 EDT 2007 | hussman
We have the same situation here. But generally it is the customer gives us a 1-up Gerber drawing and we need a multi-up or some form of breakaway to make the product. The way we achieve this is thru a Word document we call PCB Guidelines. We attac
Electronics Forum | Wed Jun 06 13:33:31 EDT 2007 | hussman
You may be JAX... My purchasing people send out for quotes from 8 to 12 different board manufactures from any where in the world. Each board mfger has different Laminate Sizes. So this makes things difficult. But wait, there's more. Now each boar
Electronics Forum | Wed Jun 06 09:28:35 EDT 2007 | larryp
Thanks for the help but I do have another question. First I guess that just the touching of the smock to the skin is anough to give the charge on the person a path to the smock. OK I can accept that if button up at the breast and sleeves. Now I kno
Electronics Forum | Fri Jun 08 08:26:14 EDT 2007 | davef
Testing for solder mask cure: Search the fine SMTnet Archives, for instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=15726 Residue after wave: Water in your wave soldering flux may cause your NC flux residue to go white. Indium W
Electronics Forum | Fri Jun 08 12:02:33 EDT 2007 | grics
Thanks for the excellent info on testing uncured solder mask. I just checked with Chris Nash of the Indium Knowledge base and he told me that the Indium 3592 can be cleaned if need be and that I should contact Kyzen or Zestron (they are the 2 compan
Electronics Forum | Fri Jun 08 13:49:11 EDT 2007 | ck_the_flip
From my past experience, you can usually get away with OUT the chip wave if your SMD's are no smaller that 0805, and more importantly, there are no SOT23's. A nice, clean, inerted laminar wave (with a little smart or omega help) will solder your S
Electronics Forum | Thu Jun 07 03:54:16 EDT 2007 | testbloke
I currently have issues with "slivers" of solder on or behind QFP devices. This has only occured on PB Free boards (we currently produce PB and PB Free on same equipment). This is not tin slivers, this is a long thin sliver of solder measuring up to
Electronics Forum | Mon Jun 11 10:40:46 EDT 2007 | ramseyn
Jim, Another good resource would be Asymtek (www.asymtek.com) I have had a lot of luck with their dispense equipment for underfilling applications. They have run tests in the past using various methods for our company to determine what type of epoxy
Electronics Forum | Fri Jun 08 18:30:53 EDT 2007 | jmelson
I have the entire computer box assembly from a 1306/40 series machine. This was one of the first with the AC servo motors and digital drives. It was taken from a working CSM66 at the same time as I bought a CSM84. It was included to be used as spa
