Electronics Forum | Mon Dec 06 13:32:47 EST 1999 | Bob Smith
CPk is a measure of the process variance with respect to the acceptable upper and lower limits. In your case it would be the accuracy of placement. The exact position of a chip ideally would be dead centre on the pads however in real life that positi
Electronics Forum | Thu Nov 18 19:45:26 EST 1999 | Deon Nungaray
Deon Response: Hello Will, Yes, you can reflow a double sided board using 63/37 solder paste on both sides. There are some limitations as far as the mass of the components to reflow the second time. If you have doubts or are concerned that a compone
Electronics Forum | Thu Nov 25 20:28:43 EST 1999 | cklau
hello, One way to prevent copper land delamination is to applied Anchoring spurs also referred to as "tie-down tabs" or "rabbit ears".These are a metal projection around a land.This features is fully captured by the cover lay (cover coat) that is n
Electronics Forum | Fri Nov 12 13:05:36 EST 1999 | Brian W.
As a CM, I have had customers stack components as a temporary measure of incorporating an ECO. Most of the time, it includes using an adhesive to secure the component. Cost of material already in-house is the major factor when this occurs. Even th
Electronics Forum | Wed Nov 03 10:30:27 EST 1999 | John Thorup
Hi Anthony I'm not sure I understand your question. Do you mean move to a better or more precise placement or to an error or bad position? I'm not aware of any calculation that can predict movement since it is based on so many factors like component
Electronics Forum | Wed Nov 03 20:02:44 EST 1999 | Anthony Winston
Well John here is the situation: I need to place an infrared transistor (optical element) with a tolerance of +/-.003", this is not a problem. A lens is positioned over the optical element and snapped to the PCB via three holes that have a toleran
Electronics Forum | Tue Nov 02 03:39:09 EST 1999 | cklau
FABmaster gold version can read many kinds of CAD data i.e Zuken CADSTAR , PADS ,Mentor Graphics, Cadence and etc and the best place that could find great information for manufacturing is thru the CAD data.FABmaster actually act as a multiple i/o for
Electronics Forum | Tue Oct 19 09:12:33 EDT 1999 | John O'Brien
Why use labels? They are expensive, fall off, get mangled, etc. If you directly mark the boards, you'll probably save money, enhance traceability, etc. One major contract manufacturer projects payback at 7 months just eliminating label cost and goin
Electronics Forum | Tue Oct 19 15:16:38 EDT 1999 | Frank Stryker
The CCGA is like a BGA except that the columns are more square looking and there are many more of them. They are made of lead so they are very fragile. They are very expensive. There is a special cleaning process they have to go through once it has b
Electronics Forum | Mon Oct 11 13:17:36 EDT 1999 | Dave F
| A board shop rep contacted me about a process were solder paste is applied to the board as part of their mfg. process thereby eliminating the need for paste application at the assembler. This is a new one I have never heard of, but am willing to si
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