Electronics Forum | Thu Feb 05 08:27:58 EST 2004 | pjc
We had a V-Tek TM30 manual taping machine using heat seal top tape. Had very good results- with skilled operator - to supply taped components to our 2x Fuji IP2 machines - no tape cropping. Stefan's points are somewhat valid, but you can have a succe
Electronics Forum | Tue Mar 09 20:08:08 EST 2004 | davef
Warping BGA are the usual cause of shorts in the corners and are usually caused by the reflow profile. BGA have a natural tendency to warp due to CTE and package thermal mismatch, as you have seen at rework. The PBGA will go from a bowl shape to an
Electronics Forum | Thu Apr 08 03:41:19 EDT 2004 | Ian White
I have worken in production lines where attrition rates were measured and acceptable limits were set using 3 classes of parts:- A=Expensive Parts IC's etc, B= medium cost parts Diodes, tants etc, C= low cost parts typically Chop Caps and R's. We set
Electronics Forum | Fri Apr 30 22:45:59 EDT 2004 | Bryan She
we can test the defects with multimeter after reflow ,before ICT.and if we replace this damaged parts with good ones.everthing is ok.I'm sure this part is damaged during reflow,but why not other 19 same parts of the 20 on each board?we attach a therm
Electronics Forum | Mon May 24 05:53:24 EDT 2004 | johnwnz
Here's an interesting fact, some pastes just don't wet as well as others!.. there I've said it and now people will complain but that's life. Some pastes are formulated to run in air, some in N2, soem are specifically designed to be more aggressive fo
Electronics Forum | Fri Jul 23 09:12:34 EDT 2004 | davef
We have run not AgPd [that we know of]. We can comment on PdNi. [But you're probably have Ni under the AgPd] In general, palladium solution rate is much slower than other sacrificial finish materials that we use for the purpose. The key then is to
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 | Wed Dec 15 00:18:01 EST 2004 | vinitverma
Hi Serge, If you are really looking at a new machine, why not try Assembleon AX-3 configured for 45K cph (rated speed, 30K IPC9850 speed). This machine can be future upgraded upto 90K cph (rated speed, 60Kcph IPC 9850 speed). You get placement force
Electronics Forum | Thu May 05 09:50:29 EDT 2005 | patrickbruneel
Hi Hannu, You just gave a very realistic and practical view of the lead-free dilemma. The main reason that your coil coating doesn't get removed is because of the inability of lead free alloys to wet the surface and conduct the heat. Higher temperat
Electronics Forum | Mon Jun 20 10:59:18 EDT 2005 | Jason Fullerton
Extra cooling is better (Alpha recommends -3 to -7 degC/sec) for cosmetics. Less chance of s o called 'cooling lines' that look similar to 'cold' tin-lead joints. (Seems a bit steep to me - I worry about the risk of cracking ceramic caps.) Might be
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