Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Gian.D

#10757

viscosity measurements | 6 July, 1999

who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? Thanks a lot. g. d'andrea

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#10758

Re: viscosity measurements | 7 July, 1999

| who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? | Thanks a lot. | g. d'andrea | People write books on SMT process control. What's your problem?

I think proper shelf life control of solder paste is more effective and less expensive than viscosity measurement taking and SPC charting. If you must try Malcom.

Good luck

Dave F

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Scott

#10759

Re: viscosity measurements | 10 July, 1999

| who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? | Thanks a lot. | g. d'andrea | The last place I worked used a viscosity meter, funny how little was rejected and how much more had problems. Buy only enough to keep you stocked for less than a month, follow the vendor's recommendations (all of them) and keep an eye on the print characteristics over the day and you'll be fine. Report anything "funny" to the vendor and they'll help you. Don't try to streach your paste out, tossing $10 worth of paste is cheap compared to the alternative...

Scott

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