Hi Jim,

There is no such thing as zero tolerance but if I understand your message
correctly you need to hold 0.01mm over 14mm max. I have made a quick
calculation which shows this is less than 750ppm. On a 20" panel this would
equate to 14 thou" which is a big error. No problems meeting that tolerance
for any manufacturer.

However, if it is 0.01mm over 14" then that is 28ppm which is a different
ball game ie half a thou over 20". I doubt anyone could even photo plot to
that accuracy much less produce finished pcb's so I hope that is not what
you are seeking. If it is I would like to know why you need such a tight
tolerance.

Regards
Paul Gould
Teknacron Circuits Ltd

-----Original Message-----
From: William Keeton <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 20 January 1999 14:49
Subject: [TN] Need to obtain the best PWB manufacturer...


>Fellow Mavins,
>
>I am in need of locating the most accurate PWB shop I can find. I have a
need
>for a design that has zero shrink and stretch and can keep the artwork size
>variance to a minumum of .01mm. The board size will be 11X14 (X-Y).
>Any suggestions?
>
>Regards,
>Jim Keeton, Senior SMT Process Engineer
>EFW Inc.

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