Electronics Forum | Mon Nov 27 17:39:37 EST 2000 | Dave F
Daniel: In response to your questions: * Moisture level (wt%) that may cause delamination in PCB�s. - Certainly, it depends, but 100% moisture will not cause delamination of a PCB. [Now, heating that water is another question, isn�t it? ;-)] *
Electronics Forum | Mon Nov 20 04:39:19 EST 2000 | SV
Hello, I have to design a PCB for which the customer have the following temperature requirements: -55degC to +85degC operating temp. -61degC to +125degC storage temp. My question is: does the FR4 material meet this conditions? Which are the parame
Electronics Forum | Fri Nov 17 05:40:48 EST 2000 | Wolfgang Busko
Hi Dave, I think your approach is more than some others do as incoming inspection. We just look for - damage of any kind - measure the thickness - measure a critical aperture for the correct size (reduction) - look for smooth walls - do Earls "look
Electronics Forum | Mon Nov 27 17:23:56 EST 2000 | Dave F
Thanks guys. Following on Cal's point ... we ordered a recently released IPC guideline, seeking closure. 7525 - Stencil Design Guidelines This new document provides guides for the design and fabrication of stencils for solder paste and surface-mou
Electronics Forum | Thu Nov 16 14:22:48 EST 2000 | Kris
Howdy Y'all, I have seen a problem lately with getting the 0402 parts out of the tape and onto a PCB. We are using Universal HSPs with 8 X 2mm feeders in good condition. The components are manufactured by Rohm. The tape and components appear to b
Electronics Forum | Fri Nov 17 00:27:30 EST 2000 | DL
Kris, I gather from your description that the component can not be picked consistently. Meaning that the machine can place the component. How does the component place? Is the placement text book? Take a good look to see if the component isn't being
Electronics Forum | Mon Nov 27 17:59:56 EST 2000 | Dave F
Sounds like "place" problem doenit? As best as I can tell [ever notice how the trail get fuzzy pretty fast, when someone starts asking probing questions], we received someone caps manufactured by someone other than Rolm through a distributor. The p
Electronics Forum | Thu Nov 16 09:53:42 EST 2000 | JAX
If you have the individual times for each machine you should be done. Simply find which is your bottle-neck for each day and use that info. You can probably write a seperate program to do this step also, I assume you are viewing all the down time inf
Electronics Forum | Wed Nov 15 10:26:54 EST 2000 | Rkevin
I'm looking for what I call Mylar, for lack of a better name. We used it at Digital/Compaq to help us knead paste and also to check alignment of prints without actually applying any paste to the module. It was about 4-5 mils thick, clear and came in
Electronics Forum | Wed Nov 15 10:24:23 EST 2000 | Rkevin
I'm looking for what I call Mylar, for lack of a better name. We used it at Digital/Compaq to help us knead paste and also to check alignment of prints without actually applying any paste to the module. It was about 4-5 mils thick, clear and came in
