Hi folks,

I'm investigating the feasibility of implementing SPC on cleaning operations
and was wondering what the rest of you are doing, if anything.

What types of SPC activities, if any, are you doing on your cleaning
operations?  Have any of you tried SPC on cleaning operations?  If so, what
kind of results did you have?  Did you find it worth while?

What measurements would be useful for monitoring process drift so that you
can correct the process before it starts producing less than clean boards?

For SPC activities, we've kicked around the possibility of monitoring board
cleanliness at the end of the cleaning operation, measuring solvent/fluid
quality, monitoring various machine parameters.

We have two major pieces of cleaning equipment used to clean RMA flux from
CCAs - a co-solvent vapor degreaser, and a semi-aqueous in-line cleaner.  We
currently do a cleanliness test (Omegameter or Ionograph) on each lot of
boards.  We also record various gage readings on the in-line cleaner on a
daily basis.

Thanks for any light you can shed on this issue.

Kathie Lambert
Process Engineer
Northrop Grumman
Baltimore, MD
410-765-9746

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