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 __________________________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. 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