Problem:
Partially plugged or tented via holes will not fill without vacuum..
Fabricators can do the cross section before this stage. Coupons are also
delivered without plugging.
For failure analysis of assemblies or delivered circuits , filling plugged
holes is a challenge.
For accurate measuring of platings  reaching the center of the holes is
required.
If you look for other defects, a small deviation will not be important- you
see it where it is. Horizontal cross sections : my nightmare.
Gaby
----- Original Message -----
From: "Russell Burdick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 07, 2005 4:45 PM
Subject: Re: [TN] Microsection


> Franklin,
>
> I will try to help. I have been let go from most recent board house lately
> and don't check in everyday.
>
> I don't know about controlled depth grinding/polishing.
>
> To help hitting the centers of holes you can have the cam guys add a
> plated
> trace on the centers of the line of coupon holes. Make it about 5 mils
> wide.
> When you are down to the 600 or 1200 grit paper/cloth you should see the
> plated line appear.Then put the coupon on the scopes to measure the diam
> of
> the hole and decide if more is needed on the polisher.
>
> For small holes we used to mix the mounting compound a little thin and
> poured from one side to encourage flow into those holes. When centers of
> holes are not supported by compound the metals are smeared and folded and
> useless for interpretation.
>
> You must also remember to keep the coupons identified correctly in the
> coupon. One way is to place a small piece of paper on the pins after or
> before the coupons are added to keep things straight.
>
> Depending on the total quantity of coupons you anticipate polishing, $2500
> -$4500 seems a decent price for the information/confirmation you will be
> able to acquire.
>
> Courtney Grimes is at Sturbridge Metallurgical in Mass. My last company
> purchased a used struers Abrapol from him. It could polish 6 mounts at a
> time, needed to swap paper to change to finer grits. It was significantly
> more money than the quote you received.
>
> As always I hope this helps.
>
> Russ Burdick, 508-481-0271
> free-lance process/manufacturing engineer, located now in the metro-west
> area of Boston.
>
> ps-apologies for the shameless plug
>
>
>
>
>
>>From: Franklin D Asbell <[log in to unmask]>
>>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Franklin D
>>Asbell <[log in to unmask]>
>>To: [log in to unmask]
>>Subject: Re: [TN] Microsection
>>Date: Fri, 7 Oct 2005 06:02:38 -0500
>>
>>(chuckle)
>>
>>Yes, can you believe it... got no response at all, now Steve, they jumped
>>all over his request, I'm thinking it has to do with his website and he
>>allowing people to post pictures, and so people want to keep him
>>happy...(laughing as people wonder how serious I am) luckily I'm past that
>>point where I would take it personal, but years ago....hmmm, well anyway.
>>
>>What I'm looking for is a device to grind/polishing a single mount (3 pc
>>board coupons in a single puck) by hand.
>>
>>In days past I could do a somewhat decent job, with todays smaller holes,
>>even down past 10 to 8 and even 6 I find it difficult to hit the center of
>>the hole +/- 10%.
>>
>>Beuhler makes what they call the PC-Met jr, selling cost $2500 for the kit
>>which is crazy as they sell the complete kit for 6 mounts at $4500.
>>
>>So I'm looking for a used unit, or one from another source (not even sure
>>who else might make one, perhaps Struers)
>>
>>So that's my need today...any suggestions would be wonderful.
>>
>>Franklin
>>
>>-----Original Message-----
>>From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
>>(KC/EMW)
>>Sent: Friday, October 07, 2005 4:59 AM
>>To: [log in to unmask]
>>Subject: [TN] Microsection
>>
>>What was your q, Franklin?
>>Microsection of what? Braincells or income or tomatoes? Did you really get
>>zero answers?
>>So many analysts at TN and no help...hm...you may have t cry higher, many
>>of
>>us are old and halfdeaf and the battery might been at low level, and the
>>glasses uncleansed since weeks.
>>cherries
>>Ingemar Hernefjord
>>Ericsson Microwave Systems
>>PS. I enjoy some techy topics while the renaissance is going on...he-he
>>
>>
>>-----Original Message-----
>>From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin Asbell
>>Sent: den 6 oktober 2005 23:54
>>To: [log in to unmask]
>>Subject: Re: [TN] <List>Re: [TN] New Old Topic
>>
>>
>>(nodding)
>>
>>And I asked a question twice in the past week about manual microsection
>>equipment...does anyone respond to me? Noooooo, but they jump all over
>>Steve's microsection question....jeeesh...I'm still polishing single-puck
>>mounts by hand and my fingertips hurt...and my head still hurts.
>>
>>But on the bright side the temperature here in Dallas is 30 degrees cooler
>>today than yesterday...whew...Fall has arrived.
>>
>>Franklin
>>
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