Electronics Forum: mpm sp 20 (Page 1 of 28)

20 mil qfp bridging

Electronics Forum | Thu Aug 12 18:43:49 EDT 1999 | Wayne S.

Hello Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening 100 durometer blade. Getting "tails" on deposits. Trie

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 20:17:12 EDT 1999 | Kelly Morris

| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi

Re: 20 mil qfp bridging

Electronics Forum | Fri Aug 13 12:52:17 EDT 1999 | Steve Schrader

| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi

Re: 20 mil qfp bridging

Electronics Forum | Tue Aug 17 10:41:13 EDT 1999 | Steve A

Wayne, Sounds like a gasketing problem. When the horizontal apertures are bleeding but not the vertical apertures. Could be poor underside support, HASL miniscus issues, masking or plugging issues, but what many people do not account for is that t

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 22:38:44 EDT 1999 | Dave F

| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 20:31:57 EDT 1999 | Kelly Morris

| | Hello | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | 100 durometer blade. Getting "tails" o

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 20:48:05 EDT 1999 | JAX

| | | Hello | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | 100 durometer blade. Getting "

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 21:08:39 EDT 1999 | ScottM

| | | | Hello | | | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | | 100 durometer blade. G

Re: 20 mil qfp bridging

Electronics Forum | Fri Aug 13 13:50:53 EDT 1999 | Brian Wycoff

| | | | | | Hello | | | | | | | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | | | | 100 du

Re: 20 mil qfp bridging

Electronics Forum | Fri Aug 13 13:47:52 EDT 1999 | Brian Wycoff

| | | | | Hello | | | | | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | | | 100 durometer

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