Electronics Forum | Mon Nov 25 20:38:39 EST 2002 | davef
That's basically it. In a wonderful world, the oxides flow on top of the flux during heating through reflow. Obviously when compared to reflow soldering, you create much more dross with your wave by: * Pumping a large volume of very hot solder to h
Electronics Forum | Thu Dec 05 17:10:17 EST 2002 | EW
It is an interesting topic. This will tell you if they are cleaning the boards well(Di). We typically warn our fab houses if we see them head up or over 4 micrograms per square inch. On occasion we have seen upwards of 20, and "rejected" I think
Electronics Forum | Fri Dec 06 10:16:57 EST 2002 | davef
Bare board cleanliness is still primarily measured by resistivity of solvent extract (ROSE) using instruments such as Omegameters and Zero Ions. What is considered as "acceptable" cleanliness varies between specification and from company to company.
Electronics Forum | Thu Dec 19 13:10:49 EST 2002 | gramsey
Really? Where does it say that? I have had the opposite experience and 3.2.2 from the IPC-7525 states for square or rectangular apertures - "Having a radiused corner for all apertures can promote stencil cleaning". It actually recommends circular ape
Electronics Forum | Wed Dec 25 19:27:57 EST 2002 | MA/NY DDave
Hi Hope a few others give you applicable experience to your question. I never had a real long shut down, yet have experienced short shut down problems. I would run it in the best cleaner you have in your shop before you shut down for a long spell,
Electronics Forum | Fri Jan 03 10:55:57 EST 2003 | slthomas
I'm not sure what you mean by "standard auto valve stem". Ours use EFD pumps to dispense fluid. I think there used to be a sort of a drip system that attempted to wet the entire length of the paper all at once but have never seen one. Which system
Electronics Forum | Mon Jan 06 11:04:39 EST 2003 | slthomas
Bummer. Are you using the EPAC stuff that they recommend, or something else? We used IPA for a while, then changed to a run-of-the-mill stencil cleaning solvent (aliphatic hydrocarbon based, like the EPAC solvent) that's a lot cheaper and does the
Electronics Forum | Wed Jan 15 11:42:57 EST 2003 | burb1999
we have recently been trying silver composition on our pads with our PCB boards. I am wondering what if any characteristics are different from tin etc... I have found with profiling the board it to be about the same temps. but getting granular looki
Electronics Forum | Fri Jan 24 17:53:42 EST 2003 | razan3
Chipbonder is best applied with a stencil. Too bad on the dispenser purchase. Little hint, use a Kapton Stencil. You can have them laser cut and can get them as thick as you want. Another advantage is the ability to make shapes etc for cleaning
Electronics Forum | Wed Feb 05 11:31:40 EST 2003 | lloyd
The grease to use is DAPHNE EPONEX M No. 1 as you would expect it is made by an oriental company (IDEMITSU KOSAN). Sanyo recommend that this procedure should only be carried out by trained personnel, so it may be worth giving them a ring before you s
