From the board designers' perspective, I don't know of any application where
this kind of tolerance is required.

Seth Goodman
Goodman & Associates
7687 Leta Way
Verona, WI 53593
Tel (608)833-9933
Fax (608)833-9966

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Hugh Scott Miller
Sent: Thursday, December 03, 1998 11:10 AM
To: [log in to unmask]
Subject: [TN] Hole Tolerance of +/- .001"


Happy Holidays Technetters,

A recent project has entered our shop from a customer that is demanding
that all finished hole tolerances be held to +/- .001".  I pose the
following questions to the esteemed Technet panel:

a.  Are hole tolerances of +/- .001" realistic?
b.  How could a board shop with conventional drilling technology
in-house adjust its process to accommodate this request?
c.  What type of advanced hole formation  technology (laser, plasma
etching, etc.) could be applied to meet this requirement?
d.  Can a component manufacturer produce components with leads that are
within this tolerance?

Any and all suggestions would be greatly appreciated.

Regards

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