Electronics Forum | Wed Oct 08 11:15:20 EDT 2014 | wavemasterlarry
Listen! I generally just bend them back straight. Kinda like a them knew I-fones! Ha! I like my flip fone. nothing buttton, but that's what fones are for - calling people.
Electronics Forum | Sat Sep 12 09:24:33 EDT 2020 | majdi4
at first , you need to optimise your panel design ( lenght width & postage stamp ) , use an anti-buckling cable during first reflow , and you can put trays under your panel during first reflow..
Electronics Forum | Mon Sep 14 18:40:39 EDT 2020 | dwl
A reflow oven with Center rail support can help. If your volumes are too low to justify spending $$ on a proper carrier, titanium stiffeners applied to the PCB before it goes into reflow is a cheap, albeit manual solution.
Electronics Forum | Thu Jan 14 08:32:22 EST 1999 | Jim Nunns
They are supposed to be production parts. Our volumes are in the hundreds due to rapid change though. Jim Nunns | Just a comment: we've seen PBGAs curl up at the corners, but only on prototype components that came off of a low-volume "prototype"
Electronics Forum | Thu Oct 14 20:42:07 EDT 1999 | Jeff Ferry
Grace, As deifned in IPC 7721 Procedure 3.2 Bow and Twist Repair "Bow and twist after soldering shall not exceed 1.5% for through hole PC boards and .75% for surface mount PC boards. The bow and twist shall not be sufficient to cause difficulties d
Electronics Forum | Thu Aug 09 01:05:03 EDT 2012 | sajith09
I would like to understand What will be the allowable warpage for 152mm length PCB. We are observing about 1.5mm warpage. Is that acceptable? Could you please share method to calculate the warpage
Electronics Forum | Tue Aug 10 03:42:04 EDT 2010 | aungthura
is it usual if the board has warpage on both sides after wave soldering? And, if it is, please advise me how to solve it. Thanks in advance.
Electronics Forum | Fri Dec 17 02:52:40 EST 2010 | Jacki
Hi Dave Thanks however the Forums you mentioned isn't enough to solve my proble, PCB warpage after cooling down. Hope someone can advise me more.
Electronics Forum | Mon Jan 10 23:05:32 EST 2011 | aungthura
Hi Eadthem Your way isn't work for our big size Board(620x440x7mm).After pressing the Alu Bars on the edges, the warpage happened more wider.So, we r using clamps to adjust PCB expension. Anyway, thx for sharing.
Electronics Forum | Tue Dec 07 04:23:27 EST 2010 | Jacki
Dear All I hope I can get some advice of PCB experts in here.My problem is - after wave, our big board, 640x420x1.7mm, had a warpage when the board was cooled down after wave. PCB was flat while being warm.I had tried with many type of pallet and mad
