Electronics Forum | Sun Apr 25 11:05:58 EDT 2010 | davef
Try: * Statistical Process Control for SMT; Dr. William Messina; Datasleuths; ISBN: 0967503396; 1999 * http://www.google.com/search?q=calculate+cp+cpk&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGLL_en___US374
Electronics Forum | Fri May 07 13:28:13 EDT 2010 | tonaxel
Hello SR.Tech, yes, the general positions from 1 to 16 are ok. I also changed the pressure of the spring what is on the achsis for the tape transport wheels. This helped a lot for the most wheels but not for all. I will try it again. Maybee the pres
Electronics Forum | Mon May 24 12:05:53 EDT 2010 | deanm
Did you try Techspray Wondermask W? It is water soluble and can probably be transferred from the bottle to an EFD type syringe for dispensing (we use the P and the PL that way). As far as if it will swell through the reflow, I don't know. We don't us
Electronics Forum | Mon May 24 19:43:46 EDT 2010 | jry74
Can anyone share some good practices to reduce FOD in the conformal coat area? I am new and trying to get my hands around a serious FOD issue. We get red, black, blue, and white fibers that gets trapped in our conformal coat, causing a lot of scopi
Electronics Forum | Sat Jun 05 14:20:10 EDT 2010 | davef
It's a common problem. Try using a different needle diameter. Paste type||Suggested needle size II||21 or larger III||23 or larger IV||25 or larger V||27 or larger VI||30 or larger Additionally, improper clearance between the auger pump screw and t
Electronics Forum | Wed Jun 30 19:31:40 EDT 2010 | jry74
Tim, try and incorporate an inline wash system. We use one with a surfactant and it cleans the "NO CLEAN" fluxes well. If you dont have an inline system, you can manual clean the boards with an surfactant and IPA. You can also do an ionic contamin
Electronics Forum | Fri Jun 25 15:04:39 EDT 2010 | siddharth
Thanks for you suggestions, guys. davef, I am gonna get with my PCB suppliers and talk to them about copper balancing and checking the Tg of the materials they use. SC, I am working towards designing wave pallets for my boards and try your suggesti
Electronics Forum | Mon Jun 21 21:02:27 EDT 2010 | tpvnew
Dear experts, I am new in this field, I try to figure out an SMT line’s capacity, but, it looks the capacity varying from a lot of factors, such as, number of component, layout of component, size of PCB… I am wondering if there is a simple but accura
Electronics Forum | Wed Jun 23 01:37:38 EDT 2010 | tpvnew
Thanks for the input and advise. Yes, indeed, for single or just few products, to get the lowest ones should be no problem. However, I am facing so many products in the line, and the mix is changed all the time, it is difficult (for me, at least) to
Electronics Forum | Sat Jun 26 02:32:32 EDT 2010 | prinsisgarcee
how do i calculate false call rate? i got this equation = [over reject / (total solder joints + components) ] * 1000000 and i got a table which shows data like number of solder joints, components on panel, and number of false call, and the false
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