Electronics Forum | Tue Dec 17 20:25:13 EST 2002 | iman
Check : 1) design aspect ratio / are ratio required to fabricate the stencil you r using. 2) check if the stencil maker is using your checked aspect ratio / area ratio? if not the same, what are they using? any QA report confirming actual dimension
Electronics Forum | Fri Aug 22 09:50:20 EDT 2003 | Mike Snider
I am placing a plastic Cypress, 256 pin BGA on a small assembly, and I cannot stop the corners from bowing. I've moved my profile up and down with no results. Any suggestions?
Electronics Forum | Fri Jun 25 22:30:47 EDT 2010 | smthexi
i think you need to use a PCB central support. do you know that part ? it specializes in preventing PCB board from bowing during wave soldering.
Electronics Forum | Tue Feb 23 09:26:34 EST 2016 | tombstonesmt
Good to hear! Never dealt with an assembly that large. 24" is the longest we've built. One issue we encountered was bowing due to the vacuum seal being too tight. Bowing caused transfer issues between conveyors and equipment. -TSS
Electronics Forum | Wed Oct 17 10:37:13 EDT 2001 | davef
Help us understand your situation better: ARE THE QFP BOWED? If so, * Where are the QFP bowed? * Is the QFP body bowed or is it just the leads? * How much are the QFP bowed? * Are all QFP the same part number, from the same supplier, date code
Electronics Forum | Tue Aug 08 18:25:13 EDT 2000 | Tom Gaffney
Does anyone know a consultant or a good source of information for addressing board warp and twist problems? I am looking for a list of proven remedies that I can try. Thanks!
Electronics Forum | Wed Aug 30 06:56:34 EDT 2006 | billyd
Keep in mind; if you're building warped or twisted boards, do NOT use the Grid-lok system on them, as they tend to conform to the bend or twist of the underside of the PCB, so it will not flatten or straighten out much at all when it's brought to the
Electronics Forum | Mon Oct 21 11:25:16 EDT 2019 | mendezt6
It sits flush in the bank and twist fine. The open and close are the 2 tabs on the tool bank right? When it’s closed the tool is twisted so it can’t pull up and open is the opposite?
Electronics Forum | Thu Aug 10 13:12:10 EDT 2000 | Bob Willis
You may care to review the following from my Circuits Assembly page on line. "HOW FLAT IS FLAT AND DO WE NEED FLAT CIRCUIT BOARD, YES WE DO ? As production problems go there is one that keeps reoccurring time and time again. The blame is usually di
Electronics Forum | Wed Jun 03 07:02:25 EDT 1998 | Earl Moon
| Does anybody know if a contraption exists that will minimize a PCB's tendency to become slightly bent after reflow? We have a new product that we're planning to assemble in a couple of months. The board is 9.7" by 13.4" and it is imperitive that
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