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October 2005

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Tue, 4 Oct 2005 10:39:40 -0400
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text/plain
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But I remember in a Superman comic from my youth that Superman was able to fly across the state line and capture a criminal who shot at a penny Superman spun into the air.  Why? Because defacing coins of the US Mint is a federal offence.
Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin Asbell
Sent: October 4, 2005 9:57 AM
To: [log in to unmask]
Subject: Re: [TN] Microsectioning equipment...


Sounds like a near complete list, just a few thoughts

What size samples will you be collecting/inspecting? Last check I made
Struers made (older style) larger mount cups than Buehler, but the Buehler
system was easier to use. The Struers wheels are easier to swap than
Buehler, but the Struers mount head was easier to swap.

You note polishing wheels but not paper, depending upon the clarity you may
need as many as 5 or 6 different types of sandpaper and cloths. 180, 220,
320, 600, 1200, polishing cloth, mylar are what we use regularly, we have a
few grits between some of those we use on occasion.

Etchant is a necessity if you are wanting to few demarcation of differing
base metals. I'm assuming you will use a cold mount process, there is really
no big difference between the different mixes, Buehler's Sampl-Kwik is a
good mix.

I like the Struers polishing head set-up, to go from course to fine grinding
you unloosen three nuts, twist the head, tighten and you're good to go, the
Buehler system (not sure of their Nelson-Zimmer system is any different) you
have to remove the head from the machine and flip the head itself.

And lastly, you need to purchase a whole boatload of patience and
practice...

Good luck, and Steve, when the urge to microsection a coin from your pocket
hits, go with it, everyone involved in microsections has done so at one
point or another...(grin)

Franklin




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, October 04, 2005 8:25 AM
To: [log in to unmask]
Subject: [TN] Microsectioning equipment...

Morning Everybody!

As some of you might have read in my past posts, I don't have much
capability (read: none) for microsectioning PCB's in-house, other than
a Dremel tool and a desire to try and see things.

Things look like they will possibly be changing in the future as far as
our microsectiong needs...we will need to have at least a basic capability
in-house to do a decent microsection. One of the things besides PCB
sections
that we will be looking at, is to be able to verify void-free underfill.

I'd like to ask those of you that do microsections all the time for a
favor. If
you had to set-up a basic capability from scratch, what would be the
minimum
things that you like to have. I can fumble around and eventually get
everything
I need, but I thought; "Why re-invent the wheel?" So I thought I would ask
you all...

Just off the top of my head, these are some of the basic things of what I
think I
should have:

1. Diamond saw
2. Series of grinding/polishing wheels
3. Potting molds
4. Potting materials
5. High magnification microscope
6. ?

If there are things that you would add to the list, please add them for me.
If there
are certain vendors of the things on the list that you feel are better than
others,
go ahead and list them as well. If you feel that you should respond
off-line on
those items, do that as well.

I'm not trying to set-up a full blown failure analysis lab, just something
that will give
us the capability to spot some of the obvious problems from a microsection.

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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