Electronics Forum | Wed Mar 02 06:15:56 EST 2005 | adlsmt
Russ, are you using any reduction on your stencil aperatures? How much for what type of parts? We seem to have to many problems with resistor network aperatures clogging. How well does this paste release from small aperatures?
Electronics Forum | Wed Mar 02 08:53:58 EST 2005 | jdengler
I like Alpha Metals OM-5100. Very long stencil life with good results. Jerry
Electronics Forum | Wed Mar 02 09:19:33 EST 2005 | Indy
we use SENJU M705. type3 solder paste. Has a good shelf life.
Electronics Forum | Wed Mar 02 11:00:27 EST 2005 | prabhu_jude
But our requirement is that the conditioning unit has to be kept at a distance from the sensor. Is there any compensation circuit available to reduce the noise effect?
Electronics Forum | Wed Mar 02 13:13:55 EST 2005 | Dilbert
You can contact the manufacturer of the sensor, I don't think they would have anything but they may be able to give you some advice. Can you route the cable a different path away from other cables or objects creating noise?
Electronics Forum | Wed Mar 09 04:21:16 EST 2005 | Rob
We have a couple of presses we use for cutting adhesive backers & depanelising flex's etc. You can usually get away with steel rule dies which cost a couple of hundred dollars instead of hard tooling.
Electronics Forum | Wed Mar 02 09:28:02 EST 2005 | bobsavenger
I am looking for images of solder paste defects like Past stringing, paste gorging and dog ears. I would also like to have the avi file to show how tombstoning happens in the reflow oven. Thanks Bob
Electronics Forum | Wed Mar 02 16:48:03 EST 2005 | davef
Try: * SMT-In-Focus SMT Failure Library http://www.smtinfocus.com/smt_failure_list.html * Bob Willis Defect Browser http://www.smtinfo.net/Db/_Bob%20Willis%20Defect%20Browser.html
Electronics Forum | Thu Mar 03 09:29:12 EST 2005 | jdengler
This sounds like you are using a straight ramp profile. For this type of an assembly you may need to use a soak type profile. Most solder paste providers show you both types of profiles that work best with that paste. I would try using that profil
Electronics Forum | Thu Mar 03 10:59:37 EST 2005 | Rob
Also try boosting the bottom zones up to get extra heat in. Now try this at lead free temperatures & watch them go pop as the air inside expands & vents at the base. O to be in America & be free of our wonderful european decision makers.
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