Electronics Forum: what (Page 1040 of 1843)

Re: Reflow Oven Evaluation Using Cpk

Electronics Forum | Thu Mar 19 11:44:00 EST 1998 | Earl Moon

| | Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | | 1. C

Placement Program Control

Electronics Forum | Mon Aug 06 09:08:55 EDT 2001 | wbu

Dave, so what�s a good program anyhow? What about the setup configuration ? ... and who�s gonna say that your so optimized program will run after month and month while your equipment has gone through several aging and whatever processes? So we all

B.I.C. SMT Process Controls

Electronics Forum | Wed Aug 08 10:58:29 EDT 2001 | delnosa

Understand your advise, but don't know if you've dealt with Asian (Taiwan, China, Malaysia, etc.) motherboard suppliers in the past. They have some of the most technically advanced equipment and some of the most challenging products to produce, but

Why is NC the prefer process for BGA mounting? why not WS?

Electronics Forum | Wed Aug 22 14:57:47 EDT 2001 | mparker

Lookit here, Mugwump, The SMT community at large is composed of a vast array of expeiences, some barely with SMT 101 behind them to others who have probably already forgotten more than you'll ever learn. Without direct, personal contact of any

Board support issues

Electronics Forum | Tue Sep 18 13:09:21 EDT 2001 | jschake

Hey, where's the 0201s? Just kidding. Off the top of my head, I do not recall seeing results of such a test. Nonetheless, I�ll consult with my peers and let you know if we come up with something that could assist you. That said, with a few more d

Excess Flux in uBGA rework

Electronics Forum | Tue Sep 25 12:50:13 EDT 2001 | mparker

Since you are mostly concerned about the flux and suspect an application issue, you need to do a few things to validate whats going on. 1. Forget about speed of processing, length of time to do the job. Focus on accuracy first, then speed. with that

blocking off stencil apertures with tape

Electronics Forum | Wed Oct 10 20:35:17 EDT 2001 | djarvis

Stephen, I don't understand this at all mate. 1. If you don't place a QFP and get bridging across the bare pads, you were gonna get absolutely horrendous bridging if you did put one down. That points to poor printer set up or stencil design or both

Paste Dispensing

Electronics Forum | Thu Jan 10 06:41:43 EST 2002 | Dreamsniper

Okay, I've read about the pros and cons about solder paste dispensing. Now, I have a Camalot 3800 and I want to experiment about dispensing solder paste. I have a needle gauge of 25GA, 23 and 22. My pcb components are; RC 0603-1812, Size B, C and D

lead substrate materials

Electronics Forum | Wed Jan 30 17:44:38 EST 2002 | davef

The gold is compatible with your solder. Gold will dissolve in your solder very quickly. Assuming you have a fairly large [~ couple hundred pounds] solder pot, the gold will not, over the short term, affect the performance of the pot. The issue is

Process control, SMT inspection and rework

Electronics Forum | Wed Apr 10 10:32:39 EDT 2002 | slthomas

Ask your compadres how you can control a process when it's output has already been completed? If you do second side assembly before you inspect the first side, you can't possibly apply real time corrective action. I know what I'm talking about in t


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