We use those small copper strips to simulate a trace running under the
part.  By doing this, the height profile or glue application is the same
whether there is a trace through that area or not.  The dummy trace
provides process consistency.

Jon Moore
TRW

>>> SteveZeva <[log in to unmask]> 04/28/98 05:20pm >>>
Hi Steven,

     I remember that discussion, it was pretty enlightening. Along those
lines, I do have a question about something that I've seen on a few
boards in
the past...

     There's been boards I've run across where the designer added (or
left in)
a small strip of copper in between the pads on the bottomside locations. I
didn't know what they were at the time, but after learning a few things
about
the shorting issues that occur during wave, I think maybe those little
strips
of material were there to possibly prevent that.

     I know whenever I ran boards that had those features, I would have
to
decrease the amount of glue I was dispensing otherwise I would lift the
part
off the pads during cure. Has anybody else seen or heard of a design
practice
like that? Does it prevent the kind of shorts that have been discussed?

                             Just curious...

                            -Steve Gregory-

P.S. Thanks everybody on the suggestions about how to care for a
      conductive tiled floor, it was most appreciated!!

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