Technically, If there is no tolerance specified and no governing spec called
out in the notes .... you have a zero tolerance part.
 Frankly, the designer should review the drawing and specify a tolerance. If
there is a general tolerance called out by decimal places in the title block
it would take precedence if there was no tolerance called out on the
dimension...
 As a designer, I always appreciate a telephone call if there is anything on
the drawing that doesn't make sense.... I don't like to admit it... but
haste can do some strange things....
 If I were you, I would call....it's better than making assumptions. He/she
may have a need for tight tolerance or may not care... but let the designer
make the decision...

- Bill Brooks


-----Original Message-----
From: Bill Decray [mailto:[log in to unmask]]
Sent: Wednesday, September 20, 2000 4:20 AM
To: [log in to unmask]
Subject: [TN] finished thickness


Hello Fellow Tech net Friends

Question: If a finished thickness of a multi-layer board is stated on a
drawing but there is no tolerance what is the IPC standard
and were can I find that spec.  I was to understand that the tolerance was
+/- 10% of the finished thickness.

William W. DeCray III
Waytec Electronics Corp
Sales Engineer
PHONE:(804) 237-6391 ext 115
FAX:    (804) 237-1324
E-mail:<[log in to unmask]>
Web <http://www.waytec.com>
FTP <ftp://ftp.waytec.com>

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