Electronics Forum | Wed Apr 09 15:05:45 EDT 2003 | russ
Probably of no help but here it is anyway This is a tuff one. Attrition is due to many factors. You have machine rejects (visual fail, no pick), feeder set-up loss each time a reel is removed you lose X number of parts depending on feeder design (w
Electronics Forum | Wed Jun 25 18:17:48 EDT 2003 | Brian W.
Water soluble pastes generally work best with a ramp-to-spike reflow profile. Check your paste manufacturer's recommended profile. There are many factors that impact your profile; board thickness, component density, buried thermal masses, board si
Electronics Forum | Mon Nov 03 12:15:12 EST 2003 | fmonette
Hi John, There are different types of cabinets available with desiccants or Nitrogen/dry air. The best choice depends on many factors in your production environment. The most important consideration for level 4 components, is to make sure that your
Electronics Forum | Tue Jan 13 23:44:23 EST 2004 | fastek
If I may clarify something as to not give the wrong idea. As a used equipment dealer my focus is on the cost of ownership only for myself and the buyer at the entry point. I was assuming (perhaps incorrectly) from the gentleman's statement that the m
Electronics Forum | Thu May 06 13:19:57 EDT 2004 | fmonette
Hi Rob, You might want to consider changing your current procedure. Components classified MSL 4 have only a 72 hours floor life at 30C/60%RH. Even if you consider the de-rating factor (table 7-1 in J-STD-033A), at 50% this maximum exposure time wil
Electronics Forum | Sun Jun 27 10:48:46 EDT 2004 | crios
I am a Quality Engineer which went from an Automotive QS9000 company manufacturing ceramic hybrid boards and now I am with a ISO PC mfg. company dealing with PCBA boards. I've been assigned a task in determining the contributing factor to high contam
Electronics Forum | Fri Aug 13 09:49:57 EDT 2004 | russ
What are you measuring? Actual placement speed vs. rated speed? Machine down time? A lot of this depends on your type of enviroment. If you build high mix/low quantity/prototype your numbers will be very low and will vary depending on the complex
Electronics Forum | Fri Aug 27 00:26:14 EDT 2004 | charly
hi, encounter few cases PCB was delam after reflow, and the supplier was refuse that this is a PCB manufacturing defect as the fallout is low within one lot. the cost for this scrap is high after PCBA level, my query here are 1) is there any way
Electronics Forum | Tue Nov 02 05:28:24 EST 2004 | rlackey
Hi Chunks, That would be due to Mr Dumont asking for recommendations on types of ovens! Yes, I agree paste is a major factor, as is type of board (size, construction, palletisation, heat requirements etc), but also real experiences from users help
Electronics Forum | Tue Nov 09 16:24:53 EST 2004 | davef
Your board fabricator is: * Correct that +-20% is the tolerance of the IPC specification * A moroon for not correcting the artwork to compensate for etch factors Find a new supplier. Baring that, if the SMT pad width is critical, you can specify th
