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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 1 Oct 1998 10:54:11 EDT |
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Good Day All!
I was asked a question by the GM the other day about X-ray that maybe I
can get some input on. The higher ups have been thinking about whether or not
we need to purchase an x-ray machine. We do have sources here in Silicon
Valley to take assemblies for x-ray...at anywhere from around $75.00 a board,
up to what's called "minimum lot charges" of $750.00 by vendors that want long
term contracts with you.
We're a start-up contract assembly company, and just like any start-up we
need to be pretty frugal until we get ourselves established. As most of you
are aware, BGA's are becoming pretty commonplace, micro-BGA use seems to be
rocketing...at least on the new designs I'm seeing. So that does create a need
for x-ray, and I might add, as a process verification tool, not a process
control tool.
The GM asked me a how often would I use the x-ray if we had one, and with
the assumption that we've got our processes under control and are able to set
a job up repeatably..."Good question..." I told him. He told me to think about
it and give him my answer sometime this afternoon.
So my question is, those of you that are rich enough to have x-ray, how
do you utilize it? Random sampling plans? Or is it's use triggered by
something else? I know I would use it during the intial set-up of a process,
but I'm not really sure how I would use it on mature processes. If I'm doing
my job right, I've got the process that I verified during the initial set-up
under control and being monitored, so why would I need xray?
Thanks in advance!!
-Steve Gregory-
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