Electronics Forum | Mon Sep 25 16:14:16 EDT 2000 | LarryK
What do you all do to fix coplanarity on fine pitch QFPs? I know that the best thing would be to send them back to the vender, but what about the when you gotta use them? Straightening by hand seems to be so time comsuming. Any better ways? Larry
Electronics Forum | Mon Dec 20 07:58:02 EST 1999 | pascal MATHIEU
hello guys ; we are using a fine pitch component(0.65mm) on a thick copper PCB (Cu = 90�m) ; in this case we notice that we are in the process'limits , because the different supplier of the PCB are not able to ensure a good stability of it's process
Electronics Forum | Mon Oct 14 14:35:51 EDT 2013 | garym4569
Thanks for the replies. I have just ordered the IPC Stencil Design Guidelines manual.
Electronics Forum | Fri Oct 18 11:19:29 EDT 2013 | cyber_wolf
Nano coating = Rain-X = Snake oil
Electronics Forum | Tue Oct 15 19:27:08 EDT 2013 | swag
See if you can get a sample of Dek's Nano Protek. We use it on all our fine pitch stencils. I'd say it's kind of like car wax for the aperture walls. They operators really like it a bug me every day to order more if we run out.
Electronics Forum | Mon Oct 14 10:53:28 EDT 2013 | emeto
0.5 if you use electroformed stencil or > 0.8 if you use laser cut. 2. Always use fresh paste 3. Uses the right printer parameters for your paste(for example Alpha likes fast release of the stencil from the board - in DEK this is called separation s
Electronics Forum | Mon Oct 14 14:11:39 EDT 2013 | island2013
Yes, I agree with Evtimov. It's more about aperature reduction and type than it is the type of machine. Aspect and and Area Ratio are very important. Take a look at this page I found on the internet http://www.qualiecocircuits.co.nz/stencil-techno
Electronics Forum | Wed Oct 16 10:05:36 EDT 2013 | markhoch
I heard it works well on Chrome Rims for your car too. Swag, I'm not at all suggesting that your operators have discovered this and this is why you keep running out and have to keep ordering it :-p
Electronics Forum | Thu Oct 17 16:19:04 EDT 2013 | island2013
I've used the Nano Protek product in the past and it is fantastic, worth every penny for those small aperatures. It's just like a wax and yes it works great on rims ;)
Electronics Forum | Fri Oct 18 09:27:53 EDT 2013 | dontfeedphils
I believe it's mostly worn off through cleaning solvents and the slight abrasion during the under stencil cleaning process. I couldn't say whether or not it's ever in a state that would allow it to transfer to the PCB though.
