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December 2002

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Subject:
From:
John Foster <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 6 Dec 2002 09:04:29 -0800
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Thank you to everyone who replied to my question about resolution.

John Foster

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve MacDonald
Sent: Thursday, December 05, 2002 7:02 AM
To: [log in to unmask]
Subject: Re: [TN] Question about resolution


Hi John.

We build down to 5 mil space and trace, sometimes a bit tighter, and accept
that we can lose 1-2 mils at imaging, 1-2 mils at drilling, and some at
press, and then there's the mysterious mil loss that randomly plagues you
without warning. (Justifying my job, by the way)  If you did the math we
went past 5 mils about 3/4 of the way through the first sentence.  1/10th of
a mil can and is important, but at that point its moslty experience with
your equipment, luck, and some Disney magic. (For us anyway) So it depends
on the technology, but as a blanket--baseline, don't go tighter than 2
decimals for mm and 4 for mils, unless your customers expect to see it. (At
that point ts merely for their benefit.)

Of course I may live in a cave. Anyone have something more specific?

Steve

----- Original Message -----
From: "John Foster" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 04, 2002 14:11
Subject: [TN] Question about resolution


> It seems that there are a lot of very experienced fabricators in this
forum.
> I have learned a great deal from reading the posts.
>
> I started laying out boards in 1998, it is not my chosen profession but is
> starting to become my chosen profession. I enjoy it very much.  When
> I started a old manufacturing engineer gave me a set of guidelines to
follow
> and something's I am still figuring out on my own. With that said here is
my
> question to the forum.
>
> Right now I am sending all my gerbers and drills out in millimeters in a
3,5
> 274x format.
>
> So that means I am calling out things at 1/100,000 of a millimeter. I know
> that this has
> to be way beyond etching tolerance and what a drill can hold on tolerance.
> This is kind
> of what I started with. I have begun to change all of my designs to a .05
> millimeter grid.
> But I still have some old legacy stuff from when I really didn't know what
I
> was doing.
>
> So my question is what is realistic. At how many decimal places in
> millimeters or mills
> does it become nonsensical and a waste of time for the guy or program that
> has to
> round everything off.
>
> What kind of tolerance can a modern drill hold?
> At what point does the photo plotter or direct imaging machine run out of
> gas?
>
> Once again I have learned a great deal from this forum and would
appreciate
> any kind of response
>
> Thank You
> John Foster
>
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