Electronics Forum | Tue Mar 13 02:18:07 EST 2001 | JT
Biggest problem with the IIF is placing components with varying thickness (i.e. multpile vendors). We have to adjust production programs at start of each run to prevent excess scrap. Line Sensor tolerances can be adjusted to accept a wider range of
Electronics Forum | Mon Jul 09 14:03:39 EDT 2001 | ohboy
Make sure you're getting a good roll from your squeegies. Poly will "scoop", leaving less, nickel will add a little extra. A slightly shorter blade height out of the holders will help promote a good roll- this helps push the paste into the thru h
Electronics Forum | Thu Jan 27 10:22:21 EST 2000 | JAX
Dennis, Not sure why your so secrative about what machine but I guess it doesn't matter. When you start placing 0402 & 0603 packages the difference between height and width and length gets lost in tolerance. This allows the machine to pass parts t
Electronics Forum | Fri Oct 01 14:16:15 EDT 1999 | Rick
I know there are a ton of variables that affect the overall height of a BGA after soldering to a PWB but... I'd like to know if anyone has done an analysis of (or if it's documented) as to what the pre and post reflow height dimension as measured fr
Electronics Forum | Sat Feb 14 13:28:47 EST 1998 | ASHOK DHAWAN
I am beginer in BGA assembly and am confused in selection of pick and place option. As per book on 'implementation of BGA Technology-by 1995 aeic inc. states that BGAs reflow is quite forgiving and you need only Mechanical centering of PBGAs. The IPC
Electronics Forum | Thu Oct 18 18:57:35 EDT 2001 | davef
I doubt that it has as much to do with the tolerance as it does: * Who manufactured the part. * What technology was used in fabricating the part. We get various thickness for the same part number [ie, pakage size, value, power, tolerance, etc.]. It
Electronics Forum | Wed Mar 02 10:49:45 EST 2005 | Dave Erbst
Try checking your Z height and also make sure that they are cleaned regularly. If the Z height is off your will be pressing your nozzles into the holders thereby causing them to bind up inside the holder. Replace the springs periodically since they d
Electronics Forum | Wed Sep 28 01:32:15 EDT 2005 | Mika
Try vision type 12 for capacitors, this will give you much better acceptance in the vision inspection, since those are slightly rounded. Resistors works normally fine with vision type 10. If you have a component that is very hard to get pass the visi
Electronics Forum | Wed Jun 24 18:44:14 EDT 2009 | mark_h
Hi Everyone My company has done loads of 0402 placements but are now required to start looking at 0201 and micro BGA placements. I’ve done loads of research and I’m happy with stencil design, area ratio, oven profile, machine requirements and paste r
Electronics Forum | Wed Jan 08 08:20:52 EST 2014 | emeto
To most of our boards I give 20-30% tolerance in both directions. From experience if you have big aperture on your stencil, the squeegee will scoop certain amount of paste from this aperture and you will see lower height. Depending on your board supp
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