Electronics Forum | Mon Oct 14 17:28:08 EDT 2002 | msimkin
Russ, Thanks for the feedback. Yeh, we are placing them in production using a full ball detect Yamaha placement machine, 5 thou square stencil. etc.etc. The only reason I raised this concern was from a rework point of veiw (actually, the board desi
Electronics Forum | Mon Oct 14 03:14:08 EDT 2002 | msimkin
Hi, Has anyone had expereince in the design or use of mini rework srtencils for uBGA applications? What was the deisgn guide lines used. I am looking to rework 0.7 & 0.65 mm uBGA parts with standard hot air, without split prism placement guides. It i
Electronics Forum | Mon Oct 14 09:31:46 EDT 2002 | russ
First off, are you planning on placing these parts with your placement machine since you mentioned that you do not have an alignment system for rework? I would be leery of handplacing a BGA into paste by steady hand and craned neck alignment. Seco
Electronics Forum | Mon Oct 14 17:59:45 EDT 2002 | russ
When I used the micro-stencils, We purchased the holder from the stencil manufacturer. As far as design we used 5mil stencils for uBGAs,6-7 mil for larger 63/37 balls, and 8 mil for CBGAs. Aperture openings used were slightly smaller than what we wo
Electronics Forum | Tue Feb 15 11:47:09 EST 2022 | dontfeedphils
Kapton or mylar.
Electronics Forum | Mon Feb 14 21:28:08 EST 2022 | dwl
What about katpon? One per use only, but it will self adhere to the PCB.
Electronics Forum | Mon Feb 14 21:31:08 EST 2022 | stephendo
And you can see at least a little through them. That can be a slight advantage as well.
Electronics Forum | Mon Feb 14 18:50:04 EST 2022 | emeto
Hello all, we have a laser machine in house(we bought it to cut foam) that looks pretty accurate. We are considering to start cutting our own repair stencils, so I am researching into the material side of it. Would you recommend what kind of materia
Electronics Forum | Tue Feb 15 18:03:42 EST 2022 | emeto
Thank you guys. So far we have Kapton and Mylar on our list. If you can come with more, will be appreciated. We will do the whole study after we have enough candidate materials and I will share with you results.
