You are right, but if for some reason you have a line down situation, and you have to suck it up to ship boards now, you could put Kapton tape on the bottom side of the stencil to block off the specific apertures. Now, if you have dozens of these, then you have your work cut out, and in frustration, you may end up taking the subject stencil and coining it over someone's head. Hmmm, good luck!
Howard Watson
SMT Manufacturing Engineer
AMETEK/Dixson
Grand Junction, CO
05/14/03 10:28 AM
Please respond to "TechNet E-Mail Forum."; Please respond to SteveZeva
To: [log in to unmask] cc:
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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