Electronics Forum | Thu Oct 02 08:26:41 EDT 2008 | rway
We had similar issues until we went to a 6 mil stencil thickness.
Electronics Forum | Thu Oct 08 03:27:00 EDT 1998 | Thomas Blesinger
| | | I am trying to find out, what possibilities I have, to print solder paste on a board, when the task is to have 120 Microns thickness for the biggest part of the board (85% of the real estate), and then have 250 Microns of thickness on the rema
Electronics Forum | Thu Oct 08 22:32:58 EDT 1998 | Dave F
| | | | I am trying to find out, what possibilities I have, to print solder paste on a board, when the task is to have 120 Microns thickness for the biggest part of the board (85% of the real estate), and then have 250 Microns of thickness on the re
Electronics Forum | Wed Oct 07 14:55:17 EDT 1998 | Joe P.
| | I am trying to find out, what possibilities I have, to print solder paste on a board, when the task is to have 120 Microns thickness for the biggest part of the board (85% of the real estate), and then have 250 Microns of thickness on the remain
Electronics Forum | Thu Sep 26 11:44:23 EDT 2002 | abelardo
Hello everyone out there in the SMT world. I have a dilema I'm currently running a board that has 3 csp's with a .75 mm. ball pitch and .3mm ball size. And 2 qfp's-160. The stencil is 4 mils thick and I'm using a 63/37 solder paste. My reflow prof
Electronics Forum | Mon Feb 25 18:10:13 EST 2002 | stepheno
When you say "dropping" I assume you mean "rejecting" them because co-planarity is outside the tolerance you have set and the machine is putting them on the reject belt or tray as the case may be. I worked for a CM with an MPA-G3. One customer suppl
Electronics Forum | Mon Apr 28 11:37:30 EDT 2003 | terrapinstation
Chrissie, There is no "silly" question. It seems to me that, not with standing the issues highlighted in your posting, notably - risks, time, etc.. Your time would be much better spent determining the reason for the reject. If your placement equip
Electronics Forum | Wed Mar 10 08:19:01 EST 2010 | aajmera
We have these standard pitch QFPs, for which we found some coplanarity error issues. The issues surfaced during BLT. We do not have any instrument to measure the coplanarity error before the component is loaded on the placement machines. Is there any
Electronics Forum | Fri Jun 09 12:13:11 EDT 2006 | Chunks
Rob and Pete are both right. "We" had the same problem, with just one manufacturer of the same style QFP (don't want to name names here). We had the same style of QFP from a different manufacture right next to the problematic one on about 3 product
Electronics Forum | Mon Feb 25 17:07:15 EST 2002 | peterson
We are using a Panasonic MPAV2 to place some QFP's. Can someone please help me with a problem we are having with coplanarity! The machine is "dropping" parts due to coplanarity issues. What settings should we be looking at in order to eliminate the
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