Electronics Forum: distortion (Page 1 of 5)

Fiducial Shapes---

Electronics Forum | Sat Dec 14 02:51:24 EST 2002 | MA/NY DDave

Hi Thanks for this info. Hope someone new also enters. Funny I just picked up an article, too small, that writes that dots on some known pattern are used to measure distortion and then it shows distortion for square shapes (barrel and pincushion d

DPMO calc and Overall Manufacturing Index (OMI) calculations

Electronics Forum | Tue Aug 28 12:05:42 EDT 2001 | mparker

The advantage of DPMO is that the numbers used are PPM, (Part Per Million), rather than percentage. Percentage can distort, depending on volume. For instance, 100 units processed, 25 defects found = 75 percent yield. 4 units processed, 1 defect found

Juki KE-2050 and SMT XXS

Electronics Forum | Thu Jul 01 16:02:45 EDT 2021 | willkillum

Greetings. Make sure the calibration/homing chip is still with the machine and not lost, although you can buy a replacement from Juki for a not-so-nominal fee. Also, have the seller power it up and bring up the Laser image display/edge check. If ther

fiducial cleaners

Electronics Forum | Thu May 10 08:56:38 EDT 2001 | stefwitt

I think the main purpose of cleaning a fiducial is not to make them nice and shine, but to get a haze on them. In particular dome shaped fiducials create too much reflection from the light source and distort the image. The eraser pencil is a bandage,

Influence of dip-fluxing on flip-chip accuracy

Electronics Forum | Sun May 31 16:07:25 EDT 1998 | Alain De Bock

Is there anyone who knows what the influence is of the dip-fluxing process on the placement accuracy of a flip-chip. If you perform dip-fluxing after component alignment, the component may be displaced on the nozzle; if you perform component alignmen


Electronics Forum | Wed Aug 21 10:26:08 EDT 2002 | stownsend

We are using OSP coated boards and no-clean solder paste. In a few instances, we are seeing increased distortion in an audio circuit. Has anybody seen or heard of surface insulation resistance (SIR) decreasing after reflow on OSP boards? Is it possib

Nylon connectors in reflow

Electronics Forum | Mon Aug 25 22:14:34 EDT 2003 | davef

You need a nylon with a heat deflection temperature [heat distortion temperature] - 0.45MPa ( C ) similar to your reflow peak. The HDT of the nylon in your connector is probably ~200*C. For more, look here http://www.tycoelectronics.com/environment

Double side BGA mounting.

Electronics Forum | Tue Oct 03 13:08:39 EDT 2006 | Moby

This is an issue that we are seeing a lot! It used to be that the primary-side (component-side...top-side) had most of the active components. It was simple: reflow bottom first. Now, we are seeing both sides of the assembly having the same amount of

Forum Spam

Electronics Forum | Mon Feb 12 10:27:33 EST 2007 | muse95

Tha type of stuff (distorted words, email address verification) possibly stops automatic computer generated spam, but as explained to me on another forum, even with those registration steps in place, there are real people out there that are paid for

QFN aligment issues

Electronics Forum | Mon Jul 02 16:05:54 EDT 2012 | stentech

using fids instead of pads I agree would be more accurate. However if the board and stencil do not register then nothing will align. We have started to fo many stencil to board matching due to board distortion either before or during production. We a

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