Daan,
It's not your supplier but his supplier of laminate. Check out IPC-4101
Table 7 which gives the tolerances.
Rick Howieson
http://www.gt-corp.com

>-----Original Message-----
>From:  d. terstegge [SMTP:[log in to unmask]]
>Sent:  Wednesday, July 05, 2000 9:56 AM
>To:    [log in to unmask]
>Subject:       [TN] Tolerance on board thickness
>
>Hi Technet,
>
>It's quiet on Technet. Or is it just me ? Problems with the server again ?
>Compensation for all the double messages from a few weeks ago ?
>Anyway, I've got a small question :
>We've ordered a 4 layer FR4 board with a thickness specification of 1.6 +/-
>0.05 mm. The supplier says he can't build it with such narrow tolarances. The
>customer won't accept anything worse than this.
>What do you think, should the average fabhouse be able to build a board like
>this or is it completely unrealistic ?
>Hope to hear from you.
>
>Kind Regards,
>
>Daan Terstegge
>SMT Centre
>Signaal Communications
>Unclassified mail
>Personal Website: http://surf.to/smtinfo
>
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