Franklin,

My experience is that a 0.006" drill is way past most shop's experience
unless they specialize in packaging substrates. Think of how thin the
shank is when you cut back the cutting surfaces! Very very fragile drill.
Very very difficult to remove much material out the flutes while drilling.
And then, very very difficult to plate that hole. I don't know how you
find yourself needing a 0.006" through hole; when we need a 0.006" hole we
design it as a blind via. It would normally be a laser formed blind if the
target depth isn't too deep; if it needs to go fairly deep into the board,
then we design that section as a sublamination. It costs to do it that way
- but it works and that way the holes get plated reliably. The other
benefit of making the section as a sublam is that you can fill the blind
holes with resin then cap and plate them - making for a very accommodating
via-in-pad design.

Valerie





Franklin D Asbell <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/05/2005 03:03 PM
Please respond to TechNet E-Mail Forum; Please respond to Franklin D
Asbell


        To:     [log in to unmask]
        cc:
        Subject:        Re: [TN] New Topic


A good question and I am not suggesting we divulge trade secrets but for
example, we are currently producing solder mask dams down to 1 mil with .5
clearance. This not only involves controlling the solder mask exposure and
developing precisely but also drill/image registration as these are for
DUT
pads of 3 mils. This is where technology is taking us today. Now
continuing
this example, I need to know how to drill a 6 mil via-in-pad (as features
prevent laser drill as an option) and our supplier say's the best they can
get us to is 8 mils. Would you share some knowledge for other knowledge?
How
many assembler and end user participants in TechNet can answer the 6 mil
drill question?

And for those of you taking notes, these are hypotheticals (except we can
indeed provide 1 mil solder mask dams).

I don't ask very many fabrication questions on TechNet anymore as I rarely
receive a response. Is this because they don't know? Are the questions
beyond the capabilities of the majority of TechNet? Or the right people
are
not seeing the question? I believe the latter.

Just more things to ponder...

Franklin



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim Henderson
Sent: Wednesday, October 05, 2005 12:29 PM
To: [log in to unmask]
Subject: Re: [TN] New Topic

With the auction of a United States PCB fab shop happening on a weekly
basis, I wonder how much information a shop is willing to share can be
attributed to the lack of questions or answers for that matter we are
seeing
here.  (Trade secrets stuff)

Jim Henderson
Colonial Circuits, Inc.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Whittaker, Dewey
(AZ75)
Sent: Wednesday, October 05, 2005 12:05 PM
To: [log in to unmask]
Subject: Re: [TN] New Topic


There have been some real whoppers told already on this forum. I don't
know if we want to encourage the participation of additional
fabricators.
Dewey


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin Asbell
Sent: Wednesday, October 05, 2005 9:00 AM
To: [log in to unmask]
Subject: [TN] New Topic

How can we increase the participation of pcb fabricators to the TechNet
forum?

Franklin

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