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April 1998

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Subject:
From:
Trevor Bonfield <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 30 Apr 1998 09:23:31 +0100
Content-Type:
text/plain
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text/plain (42 lines)
Hi Steve,
Those copper strips may have been dummy traces, put there so you can
use the same quantity of glue on those parts that have traces running
between their pads and those parts that do not.
Trevor

On 28 April, Steve Gregory wrote:
>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-

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