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February 1997

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Subject:
Blind vias & fine lines
From:
[log in to unmask] ([log in to unmask])
Date:
Tue, 11 Feb 1997 22:41:54 -0800
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Techneters,
		Can anyone help? I am having two problem areas:

	1) Blind via holes 16 mil diameter 16 mil deep contacting with 4 
inner layers. I cannot always plate copper into all holes. If I do copper 
plate them I cannot tin plate all the holes. I have vibrators on the 
cathode movement frame and a giant to clout the fight bars with a 2 pound 
hammer. Is there anything else I can do?!?

	2) Circuits with 2 mil track and gaps. The finish required is 
electroless nickel/immersion gold. How can this be done without causing 
the tracks to short with nickel spikes?

		Thanks in advance,
			Roger Hammond

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