If you are likely in future to have to put a component on a currently
unpopulated location, then having a blob of adhesive there means that you
have to remove it first. That's additional work, but the risk of it
happening has to be compared against the work/cost of blanking off your
adhesve stencil. If the risk of future population is significant, better to
keep the adhesive off those locations. If there is no risk of it happening
and the boards are not going to be modified between now and the far side of
doom's day, putting a dot of adhesive there is a non-issue.
2 cents from my Friday beer money.
Peter
Steve Gregory <[log in to unmask]> 15/05/2003 12:28 AM
Sent by: TechNet <[log in to unmask]>
Please respond to "TechNet E-Mail Forum."; Please respond to SteveZeva
To: [log in to unmask]
cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
Subject: [TN] Adhesive where no component is loaded...
Hi All!
The fun never ends...
I've been involved in a rather heated (albeit silly, I think...) debate
with an inspector here, about adhesive being deposited where there is no
component loaded.
As you may surmise from my posts over the past few days, I stencil epoxy,
not dispense. For some reason, the issue has come up with one of my
inspectors here, requesting that I get something in writing from our
customer saying that it's okay to have epoxy deposits at locations where
there is no component loaded. I told her that I wasn't going to do it
because I didn't want to look silly asking our customer if it was okay to
have a glue dot at a location that's not loaded.
Her reasoning is that we're putting something on the board that's not being
called out on the bill of material. My response is that the epoxy isn't
called out anyway, but we have to use it to be able to process this board
that has PTH and SMT on the bottom. "But there's no component there, so
there shouldn't be any glue there." was her response. "But it doesn't make
any difference, it's a non-issue" I calmly replied.
We've been debating this for 2-days now, and I'm about at my wits end.
There's nothing in the -610 or the J-STD-001 that says it's defect, or that
it's forbidden to deposit epoxy where a component isn't loaded, and there's
nothing in the documentation from our customer to keep the unused areas
free from epoxy. I've already spent much more time on this issue than I
ever thought I would. Why this issue has popped-up now, I don't have a
clue. Me thinks it's much ado about nothing.
What is your take on this issue?
-Steve Gregory-
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