Electronics Forum | Mon Feb 21 11:22:21 EST 2000 | K. Ckak
Hi Kurt, I agree with Dave F. I had exact same problem with PBGA placement. We requested our PCB vendor to plug/tent via (button printing) after HASL with SR1000 which worked well in the long run. There are couple of failure modes associated wit
Electronics Forum | Tue Feb 15 19:54:48 EST 2000 | Clarissa Ortner
I am supposed to heatsink a Temp sensor with leads .9-1.1mm(.035--43"). I have found on our engineering units that the smallest heat sink I have found commercially is still too heavy for the leads and unless the operators use exxxxtreme care the wei
Electronics Forum | Tue Feb 15 18:03:56 EST 2000 | JAX
Dane, I'll give you a quick guess before I log off; The reason you are seeing problems with dome shaped fiducials is probably because the machines in question do not use grey scale recognition. They asign either black or white( not 256 shades of grey
Electronics Forum | Wed Feb 16 05:09:30 EST 2000 | Dean
You might try a no HASL spec on your fids...but shelf life may hamper copper quality. Not a pleasant situation...opertors tend to polish the fids with erasers to compensate but this leads to eraser "bits" in your equipment and your solder! Maby op
Electronics Forum | Wed Feb 16 05:58:12 EST 2000 | Wolfgang Busko
Hi Dane, if with "dome" is meant the irregularity of a HASL finish than we had a lot of problems especially like Dean mentioned with finepitch parts and circular fids. It ended up with cleaning the fids with erasers before using the boards. Later we
Electronics Forum | Tue Feb 15 14:35:41 EST 2000 | Balas
hi I am designing a test vehicle with a range of components on it(pbga, cbga,fc, mbga, and qfps). My concern is that I would like to use a single stencil for solder deposition and not a stepped stencil. That would require me to have aperture design a
Electronics Forum | Tue Feb 15 14:25:08 EST 2000 | Sergey
Dear Sirs Good business day! I need the following feeders for CSM60 machine: - Stick feeders: 1. 20 mm x 1 2. 13 mm x 3 3. 8mm x 7 - Tape feeders: 1. 16 mm, 9" x 7 you seems to be have not this 2. 24 mm, 9" x 3 3. 32mm, 9" x 1 - Manual tray feeder
Electronics Forum | Mon Feb 14 12:39:41 EST 2000 | Dave F
Francois: Sound like a messy process to me. Choice #1: Put only SMT parts on the primary side Choice #2: Put only SMT parts on the primary and secondary sides Choice #3: Put only SMT and PTH parts on the primary side Choice #4: Put only SMT and
Electronics Forum | Tue Feb 15 13:16:02 EST 2000 | Rob Fischer
Don't feel alone. Many assemblers have the same problem but aren't fortunate enough to have say in the design of the board. They're either have a capital invedtment in a selective solder machine or pallets designed to mask bottom-side SMD. The pal
Electronics Forum | Thu Feb 17 10:14:40 EST 2000 | Jim N
We bulid many boards with fine pitch on solder side and then wave. We use a wave fixture that is custom for each board. The fixture covers the SMT components and only exposes the PTH lead during the wave process. It requires about .070 to .100" clear
