57 placement tolerance ipc spec results

Electronics Forum: placement tolerance ipc spec (Page 1 of 6)

Re: What is spec on stretch????

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"

Re: What is spec on stretch????

Electronics Forum | Mon Apr 19 10:14:12 EDT 1999 | Justin Medernach

| | | 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 .0

BGA placement accuracy

Electronics Forum | Wed Aug 22 10:57:59 EDT 2001 | wbu

Hi Steven, BGA�s are known for their ability to self align and from own experiance they do. There�s enough documentation on this one available (...don�t have the links present like Dave but I�m sure he will give you enough to spend some evenings rea

Accuracy of placement +/-100um @ 5 sigma

Electronics Forum | Mon Nov 24 02:48:33 EST 2003 | Process Engineer

I am not sure where Frank got his numbers but here is what Sigma really means. 1 Sigma is one Standard Deviation, 2 Sigma is two Standard Deviations...(anyone take a Stats class in college?) I am not going to bore you with all the stat-mumbo-gumbo

PCB Thickness tolerances

Electronics Forum | Mon Jan 29 17:45:35 EST 2001 | clem

The general guideline for most PCB manufacturers for PCB thickness tolerance is +/- 10%. Is this documented in an IPC spec? If so which one? Thanks Dave

PCB Thickness and Score Depth Standards?

Electronics Forum | Fri May 24 17:35:59 EDT 2024 | dontfeedphils

A couple questions for everyone: 1) is there an industry spec that calls out v-score depth requirements? If so, what spec is that and what are the values? I've always heard 1/3 of the depth of the PCB on each side, but I'm not sure if that's a rul

V-scoring design and equipment questions

Electronics Forum | Tue Jun 13 08:33:11 EDT 2006 | davef

IPC-2222, 5.3.1 defines the parameters of making scoring cuts and the tolerance of the cuts, but does not specify the cuts. Our spec for 0.062" thick FR-4 boards is: 0.018-0.024"

IPC Spec for PTH Hole Size Tolerance

Electronics Forum | Wed Apr 10 11:46:28 EDT 2002 | mlovett

I would like to know the Stated Specification for PTH size tolerances. Or is there a generalised acceptable limit?. We have some PCB's with hole sizes that I consider to be way off what I would deem acceptable, ie Finished hole size should be 0.89mm

IPC Spec for PTH Hole Size Tolerance

Electronics Forum | Wed Apr 10 22:23:48 EDT 2002 | davef

IPC-6012A, 3.4.1 has words to the effect of: Hole size tolerance and hole pattern accuracy shall be as specified in the procurement documentation. Our fab says: Standard Drill Sizes Drill Number ||Hole Size ||Finished Hole Size 70 ||0.028" ||0.02