Electronics Forum | Tue Aug 09 12:12:57 EDT 2005 | davef
Why are you placing Kapton dots on your board prior to wave soldering? * Prevent solder from touching the hole and the area around it. [If so, why do you need to do this?] * Prevent solder from flowing up through the hole and coating portions of the
Electronics Forum | Tue Aug 09 13:51:03 EDT 2005 | patrickbruneel
You can also insert a stainless steel screw the size of the hole in the board before wave soldering, this will prevent the solder from wicking up to the top or close the hole (this is real cheap). I still remember the good old days using toothpicks t
Electronics Forum | Wed Aug 10 12:05:11 EDT 2005 | Rob
Hi Pr, No idea what the material is - we haven't usd it for a while now, but it was flush & didn't cause any printing problems on double sided reflow. Your board house should know all about it - I would suggest some but ours are all UK or China/Tai
Electronics Forum | Tue Aug 09 13:15:27 EDT 2005 | davef
Initial points for investigation are: * What temperatures are you measuring on the leads that do not reflow well? [How does this match with the paste supplier's recommendation?] * Does the component take solder after being dunked in the solder pot? *
Electronics Forum | Wed Aug 10 04:33:35 EDT 2005 | saiwong
First, butget. Second, flexibilities. If you have tight butget, you better choose used SMT equipment instead of the new one. It will save you hundreds of thousand dollar. Second, if you change model more frequently, you do not have many to choose. Fu
Electronics Forum | Wed Aug 10 07:55:21 EDT 2005 | ajaydoshi
we are using heareous F381, F352 no clean solder paste. specially in qfp for high frequency board we observe that cleaing / removing of ' no clean flux 'is require. if we do not clean same most of time after all test & envioumental test it shows pin
Electronics Forum | Wed Aug 10 10:40:16 EDT 2005 | Larry
Hi All, We are looking for a multifunctional P&P capable of 20mil pitch and 0402 at a few kpph, preferably fully automatic. We need to stay in the $10K - $15K range. Are we kidding ourselves? And if so, what can we get in this price range? Thank
Electronics Forum | Wed Aug 10 10:52:41 EDT 2005 | bobpan
I am sure you could find an old Quad 4c that would do what you want....but remember....its old....and you would need training and GOOD feeders. I would think the price range is round-a-bout what you wanted. chow
Electronics Forum | Wed Aug 10 14:11:38 EDT 2005 | rrylande
Does anyone have suggestions or observations on what my maximum board temperature should be when doing BGA repairs on an SRT? In other words, How hot is too hot? Somebody set the bottom heater on our new BGA repair machine to blow at 275 C, and our
Electronics Forum | Wed Aug 10 14:56:03 EDT 2005 | pjc
"Too Hot" is any more heat than what is needed to reflow the solder. You should have the Auto-Profile software for the machine, this will accurately monitor and record temps. There is also port for the component itself to monitor package temp. There
