Electronics Forum: out of mark pitch tolerance (Page 1 of 1)

Re: Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 12:20:24 EDT 1998 | MARK J.

| Hi there, | I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In orde

Re: Semi-Automatic Stencil Printing of Fine Pitch

Electronics Forum | Tue Jul 20 07:56:38 EDT 1999 | Mark Quealy

| | | I use a Transition Automation Semi- Automatic stencil printer with laser cut frameless stencils. My solder paste is an SN63/PB37 RMA 291. I do not operate with in a controlled humidity enviroment. The room temp generally runs around 70 deg's bu

Which side of PCB should be prefered for screening...

Electronics Forum | Tue Sep 18 16:48:55 EDT 2001 | jschake

Why do you think that assembling the BGA, QFP, and fine pitch parts will solve your bridging problem? I would think doing this may cause you more grief by having these more massive components being reflowed upside down fall off during the second pas


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