Electronics Forum | Fri Feb 21 11:33:47 EST 2003 | Jaime
Call your glue manufacturer. It sounds to me that the epoxy is not curing properly. You should also test for shear strenght. How many pounds of pressure does it take to "pop" a cured component after it comes out of the oven? What type of oven do you
Electronics Forum | Sun Feb 23 15:20:26 EST 2003 | davef
We section no bare boards at incoming. If we have a problem that needs investigation, our suppliers do the sectioning for us. If we didn't trust their analysis, we'd: * Get a new supplier. [There is tons of capacity in this industry.] * Use an ind
Electronics Forum | Sun Feb 23 14:51:02 EST 2003 | davef
Without being clear on whether you're talking about: * Standard air knives at the back-end of your in-line cleaner ... OR * Hand held or similar nozzle. Standard air knives: This causes no problem with ESD because the relative humidity is so high t
Electronics Forum | Tue Mar 04 18:38:12 EST 2003 | ruggi
Most of what we do (across 800+ varieties) is bottom side first. In general, there really aren't any problems as long as our Customers follow the .25g/cm wetted lead perimeter spec for weight (which many don't), and don't mount tall components on th
Electronics Forum | Sat Mar 08 02:43:16 EST 2003 | Frank
We are trying to implement AOI into the mix. One PE wants it Pre-Reflow, to catch and fix the PnP screw ups and the other PE wants it Post-Reflow, because the oven will fix quite a bit of placement offsets and mainly to catch any problems that the R
Electronics Forum | Thu Mar 13 15:13:17 EST 2003 | ruggi
That's a good idea...and to add on to it, you could wash after the wave, too--it really doesn't matter. A question about this though--unless your Customer specifically requires "clean", no-clean flux whether it's ugly or not, is permitted by IPC,
Electronics Forum | Thu Apr 03 09:27:04 EST 2003 | davef
First, welcome to SMTnet. On your question, are you talking about control charts? If so, here's some background on control charts http://deming.eng.clemson.edu/pub/tutorials/qctools/ccmain1.htm What are you plotting: * Independant variables? * De
Electronics Forum | Fri Apr 11 11:26:09 EDT 2003 | Brian W.
Cracked capacitors usually are not found at ICT. Unless the cap is completely cracked, the capacitance may not change much, and the usual failure mode is a leakage current. This is usually only seen in ESS type testing, when temperature and humidit
Electronics Forum | Sat Apr 19 10:45:43 EDT 2003 | Joe
Yngwie, In a previous life, I used a mixer made by Malcolm and was very happy with it. We used Alpha 609 WS paste and experienced no separation problems. The Malcolm equipment agitated the material in a non-concentric motion which tends to "fold
Electronics Forum | Wed Apr 16 13:19:13 EDT 2003 | Takfire
Thanks Russ! The origianal complaint from the customer was in regards to what appeared as "bumpy" appearance and "holes" in the solder fillet. This problem was originally presented as an appearance issue only. Further investigation by our DPA lab r
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