Electronics Forum | Fri Sep 18 12:21:03 EDT 2009 | kennyg
Does anyone have any off-the-shelf tool for measuring air gaps under components? Specifically to measure if a part is raised beyond special specifications, such as determining if a leaded connector is raised beyond 5, 10 or 20 mils from the PCB surf
Electronics Forum | Fri Sep 18 13:23:16 EDT 2009 | fredcalkins
There may be other solutions to this, but MSC Industrial Supply has a plastic shim assortment that may work for you. Part number 00019208 for $35.54 the assortment has 12 different sizes to .02 inches. The shims are flexible and can be trimmed to any
Electronics Forum | Wed Sep 05 16:19:37 EDT 2001 | davef
tks
Electronics Forum | Sat Sep 29 08:47:38 EDT 2001 | davef
What did you change in your profile?
Electronics Forum | Sun Aug 19 20:14:57 EDT 2001 | procon
Hi Greg, Have you resolved your problem yet? Daves reply to slow the belt may be your best bet. It appears you are not heating the BGA's uniformily. The temp in zone 6 seems to be a bit odd, are you trying to prolong the soak? If so, try to increase
Electronics Forum | Tue Aug 07 20:53:14 EDT 2001 | davef
slowing-down the conveyor to allow the solder to heat these balls more. But that may not be the answer, because if the flux is exhausted, more heat will not help. Then if the flux is exhausted, the answer is to crank the belt. Two different answer
Electronics Forum | Fri Sep 28 10:36:34 EDT 2001 | gdstanton
Folks, We completed our run of these boards yesterday and indeed the problem was resolved by modifying the reflow profile. Thanks to all who responded to this posting. Cheers!
Electronics Forum | Mon Aug 06 09:15:01 EDT 2001 | gdstanton
|120 |140 |160 |180 |180 |190 |260 | with a belt speed of about 28 IPM. The uBGAs are placed parallel to each other along the smallest side. The small edges closest to each other are raised slightly and form a "hill" when looking from the horizon o
Electronics Forum | Sat Sep 29 08:12:06 EDT 2001 | roland
Gregory, Thank you for posting the results of running your boards yesterday (glad to hear everything worked out well). I am sure other SMTneters are glad to see the sharing of their information helped. Perhaps others who have used information pr
Electronics Forum | Tue Aug 07 08:20:47 EDT 2001 | CPI
Are there other components on the board? If so, how does solder quality look on them? Are they all reflowing? Are the sections of the uBGA�s sitting on a ground plane? Sounds like un-even heating. You should attach a couple thermal couples and see h
