Electronics Forum | Wed Aug 07 17:55:33 EDT 2019 | slthomas
You should be well within area and aspect ration guidelines with that. Are you printing and placing close to center on the pads? Sometimes operators will "bump" the parts to center them on the pads if they're not placed correctly, and if they've bee
Electronics Forum | Fri May 10 09:07:42 EDT 2002 | xrayhipp
Does anyone know a surefire way to print micro-vias which are centered on BGA pads and also reduces solder ballooning? Would you design a process around two stencils? -- one for the vias themselves and one for the pads. Could you fill all of the vi
Electronics Forum | Mon Jun 07 16:45:57 EDT 1999 | Dave F
| I was wondering what measurements are used to define pitch? | Frank: John's correct with the most common definition, but there can be others, depending on your perspective. TTYL Dave F Pitch. The center-to-center spacing between the (1) leads
Electronics Forum | Mon Oct 31 08:29:51 EST 2005 | chunks
Shifting? Please describe the "Shifting". I.E. is it centering, sliding to cause shorts..... Most 208s will self center. If it's causing shorts, first check your print to make sure it is on the pads. Next check placement. Another area to check
Electronics Forum | Thu Oct 30 00:12:13 EST 2003 | Grant Petty
Hi, Another option we have used here in house is to remove the unwanted BGA balls with solder wick, and then to manually place them on the PCB foot print. This eliminates the pick and place machine's optical centering freaking out because the balls
Electronics Forum | Mon Jun 07 20:06:45 EDT 1999 | Frank
Thanks for the clarification! So in generic settings what are the normally the components with the smallest pitch? Will a machine with 20 mil capability handle almost anything? | | I was wondering what measurements are used to define pitch? | | |
Electronics Forum | Thu Sep 28 16:17:01 EDT 2000 | C.K.
We've got a new machine here called the "Automated Voice-Activated Printed Circuit Board Assembly Center." Basically, the way it works is you upload all of the information to this machine (your BOM, CAD Data etc.), and then after it's programmed, yo
Electronics Forum | Fri Sep 29 11:01:20 EDT 2000 | C.K.
We've got a new machine here called the "Automated Voice-Activated Printed Circuit Board Assembly Center." Basically, the way it works is you upload all of the information to this machine (your BOM, CAD Data, type of solder, etc.), and then after it
Electronics Forum | Fri Jul 13 19:35:02 EDT 2007 | hegemon
We have had good success doing pb Free QFN work. Typically for the center pad we use ~68% coverage with 1:1 ratio on the perimeter pad. For the 68% coverage we have tried cross hatch pattern, diagonal stripes, dot series, and most successfully a clo
Electronics Forum | Sat May 06 08:00:52 EDT 2000 | Dave F
Rashad: Very evocative title for the thread. There is tons of stuff on the net on board fab. For instance: * Earl Moon wrote some outstanding articles on fab in the SMTnet newsletter ..., before they chased him away. Earl (that ol' fart) know m
