Electronics Forum | Wed Jan 23 18:15:33 EST 2008 | gsala
Hi, are you dealing with Leaded or Lead Free P-BGA ? soldering by Lead or Lead Free paste ? Any way, some time, bridges can be caused by moisture entrapped in the BGA body. Make sure if is respected the correct MSL's allowed flore exposure time, ot
Electronics Forum | Thu Jan 17 11:49:54 EST 2008 | wayne123
HI, I have ran into this a time or two, and what I did before we got the BGA rework station was to run some flux under the component, and since the flux that was in the solder on the other solder joints has at least part of the way burned off in the
Electronics Forum | Thu Apr 11 04:03:28 EDT 2002 | mwoodall
The Alpha metals Hi Check 500 is used to measure paste deposit thickness. The paste height is found from a micrometer reading determined by focussing a beam of light on a track adjacent to a paste deposit and then onto the solder paste. I've measure
Electronics Forum | Wed Apr 10 11:45:08 EDT 2002 | mwoodall
We measure the thickness of solder paste printed onto PCBs as a control of the printing process. Generally 6 thou stencils are used and give between 6.2 and 6.8 thou. What thicknesses do other users get? Cheers! Mark
Electronics Forum | Wed Apr 10 13:20:36 EDT 2002 | barryg
I am curious how you measure your printed paste thickness. We are considering doing the same. As it is now we assure we have squeegee pressure and speed controlled, have not actually measure the printed paste thickness.
Electronics Forum | Wed Apr 10 22:46:04 EDT 2002 | davef
On SMTnet, we've discussed the the frailties of controlling paste height, when volume is a more telling measure. Sometimes if you seperate too quickly, the paste tries to stay attached to the aperture walls. This creates a 'U' shaped deposit with r
Electronics Forum | Wed Apr 10 22:35:59 EDT 2002 | davef
How do you assure you "have squeegee pressure and speed controlled"? Search the fine SMTnet Archives for background on measuring paste thickness.
Electronics Forum | Thu Apr 11 10:14:05 EDT 2002 | BTaylor
We use the ASC vision master 212, our customers wanted a height and volume measurement rather than an inspector doing a visual. We have added this machine to our process, checking height on many preprogrammed locations then this generates a X bar and
Electronics Forum | Wed Mar 14 07:30:14 EDT 2007 | davef
So, you toss whatever is on the stencil every 8 hours. Correct? How long has it been on the stencil? * If that particular paste has been on the stencil for 8 hours, we'd agree to toss it too. * If paste has been on the stencil for less than 8 hour
Electronics Forum | Mon Mar 05 12:52:06 EST 2007 | DC
Any one have experience of MyData paste jet printing? I don't ave chance to take a look at Apex but it can reduce the paste, no stencil required and paste volume control by programming.
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