Electronics Forum: stencil (Page 302 of 540)

Solder void underneath the mosfet

Electronics Forum | Thu Mar 25 12:34:26 EDT 2010 | bgaguy

the voids will cause a long term relability problem as the part will not be correctly heatsinked. Change your stencil aperature to a "+" sign 15-20 mils wide in the center of the pad. ___________ : : : : :---- ----: : : :__

MPM Accuflex problems and errors

Electronics Forum | Tue Mar 30 06:27:22 EDT 2010 | ristikas

It happens on the middle of the stecil cleaning. The camera and the cleaner will stay under stencil in half way back. Then machine asking the initate the motors. If to press initate then the pcb stopper will hit the rails. Usually we move camera and

Stencil Cleaning

Electronics Forum | Tue Mar 30 19:39:15 EDT 2010 | dekhead

You don't say what type of / source of cleaning paper... there are many and some are certainly more prone to leave fibers behind.

Stencil Cleaning

Electronics Forum | Mon Apr 05 10:26:10 EDT 2010 | swag

We have used different suppliers including direct from MpM and from a couple other sources who sell comsumables. Do you have a recommendation?

Stencil Cleaning

Electronics Forum | Tue Apr 06 00:18:07 EDT 2010 | dekhead

I have always had success using the Dupont sontara material... many suppliers offer. Recently have two customers of mine who swear by the results using the Aquavator for lint free and cleaning result without solvents. http://www.dekhead.com

Fine Pitch Printing Issues

Electronics Forum | Thu May 20 16:30:50 EDT 2010 | mikesewell

I believe industry standard is 1/2 pitch for fine pitch devices. If your part is 20 mil pitch, apts would be 10 mil wide. This should gasket fine to the pcb pad and with a 5 mil stencil should print well.

Fine Pitch Printing Issues

Electronics Forum | Tue May 25 17:04:34 EDT 2010 | remullis

Yes, I use Indium Mesh 3. I have a re-cut stencil on the way. Thanks for the input!

Jetprint solder on PCB boards

Electronics Forum | Thu May 27 10:10:54 EDT 2010 | cyber_wolf

Ask yourself what advantage do you gain from a 200+K jet printer ? I'm thinking you could buy 1000+ stencils with 200K

Tombstoneing LEDs

Electronics Forum | Thu Aug 05 09:21:45 EDT 2010 | doug_johnson

I am havein a lot of trouble with KINGBRIGHT LEDs tombstoning in the reflow oven. It is a PLCC2 package. The stencil apatures are home plated. Can anyone help me

Fiducial Recognition

Electronics Forum | Wed Aug 18 08:54:07 EDT 2010 | jmw

Pads typically have paste on them. Unless you have some parts that arnt placed and you can wipe off the paste or tape off the holes in the stencil. Not a good option.

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