Electronics Forum | Thu Aug 23 12:46:30 EDT 2001 | mkallen
In this case, I know my supplier's data is good. They've been supplying this particular PN for a long time now, and the stretch problem appears to be random within a given date code (i.e., most of the boards in each lot are good, but a few exhibit t
Electronics Forum | Mon Mar 10 20:14:20 EDT 2008 | davef
We'd be unhappy with features that are not in copper that is at the same level as the component pads, because of difficulties the fabricator would have in maintaining registration between the copper pads and the ink used for the features not in coppe
Electronics Forum | Fri Apr 16 17:19:59 EDT 1999 | Dave F
| | Hi, | | I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030"
Electronics Forum | Wed Apr 11 08:36:23 EDT 2007 | davef
IPC-A-610D refers to 'toe down configuration' several times, beyond the 8.2.5.6 that you question. Although none will add to your understanding of 'toe down'. A lead that is 'toe down' is one where the foot of the lead is not parallel to the pad. T
Electronics Forum | Thu Apr 12 08:16:19 EDT 2007 | davef
Toe down solution: * Land pattern design * Solder stencil design * Proper component fabrication Normal gull wing lead solder requirement: Solder must extend to the mid-point of the outside of the lead bend.
Electronics Forum | Thu Apr 12 01:35:13 EDT 2007 | Haris
IPC-A-610D is a Acceptability of the Electronic assemblies so all your questions depends on the product classes either 1,2,or 3 and it is given in this standard about the acceptablity criteria of the soldering of any type of the components i.e. it h
Electronics Forum | Mon Apr 28 15:20:50 EDT 2014 | davef
Your customer is correct. Your supplier has clamped some sort of machine to your butt and has plugged it in the wall outlet. Honest mistake: * IPC-A-600H, 3.3.2 Lifted Lands - (Cross Sections) ... pertains to boards that were cross sectioned after t
Electronics Forum | Thu Aug 23 10:54:41 EDT 2001 | Hussman
I've always asked the board house to send me the Gerber data they used to make the board. I've found that things got moved for reasons unknown to either of us (e-mail gremlins?). 9 times out of 10 I take this Gerber and have my stencil manufacturer
Electronics Forum | Thu Aug 23 15:38:58 EDT 2001 | mparker
Bingo - the mylar is the problem. Ask the fab vendor what storage and humidity controls they use on the photo tools. The films can changed geometry from day to day depending on the ambient environment. What controls are used during production? The ra
Electronics Forum | Tue Oct 26 17:25:11 EDT 2004 | davef
In every part of the dive, assume the proper position, keep toes pointed always, relax hands but keep pointed, stretch arms, make sure legs are together during takeoff and the dive, hands have to touch the top of the toes in a pike position, moving t
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