Full Site - : johnw (Page 7 of 20)

Re: glue strangeness

Electronics Forum | Tue Sep 07 12:51:02 EDT 1999 | Brad Kendall

| | We are assembling double side pcs reflowing (smt) on top and by wave on bottom. | | After first step (smt) we dispense glue on the bottom side putting one or two glue dots under small components and we cure in oven before wave. | | After wave so

Re: screening adhesives

Electronics Forum | Sat Aug 28 14:23:52 EDT 1999 | JohnW

| Hi There, | | Could anyone please give me some pointers on screen printing non-conductive adhesives or where I could find the information avaliable. Aspects such as printing parameters, ideal stencil design and a general overview. Do already have

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 15:47:25 EDT 1999 | JohnW

| | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | Most common reason is uneven hea

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 16:42:32 EDT 1999 | Dave

| | | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | | | Most common reason is

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 21:44:03 EDT 1999 | Jason Tomlinson

| | | | | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | | | | | | | Any help would be appreciated. Thanks. | | | | | | | | | | | Most common reason is

Re: No-clean stencil apertures

Electronics Forum | Wed Aug 25 15:51:58 EDT 1999 | JohnW

| Does anyone have any information on stencil aperture/pad ratios for noclean solder paste. In the past I have experienced severe solder ball problems when using the same size apertures from aqueous products as I do with the No-clean products. Cons

Re: No-clean stencil apertures

Electronics Forum | Wed Aug 25 17:09:53 EDT 1999 | Earl Moon

| | Does anyone have any information on stencil aperture/pad ratios for noclean solder paste. In the past I have experienced severe solder ball problems when using the same size apertures from aqueous products as I do with the No-clean products. Co

Re: Reflow oven for solder side components??

Electronics Forum | Wed Aug 11 15:48:54 EDT 1999 | JohnW

| We are using a mixed technology process with mostly through-hole parts plus some SMT IC's on the component side and some passive SMT parts on the solder side. We do not have a proper wave soldering machine for doing solder side SMT (double wave or

Re: solder mask

Electronics Forum | Mon Aug 09 16:15:30 EDT 1999 | JohnW

| I am having cleaning problems when processing PCB's which have | TAIYO solder mask on them. After processing, hand soldering and | cleaning, a sticky residue is remains, resulting in a cosmetically poor finish with tide marks etc. Other soldermasks

Re: solder mask

Electronics Forum | Mon Aug 09 18:03:28 EDT 1999 | Earl Moon

| | I am having cleaning problems when processing PCB's which have | | TAIYO solder mask on them. After processing, hand soldering and | | cleaning, a sticky residue is remains, resulting in a cosmetically poor finish with tide marks etc. Other solde


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