Hole to Hole location tolerances for features drilled in the same setup
(ie. Primary drilling) should be held to +/-.003".  We see many designs
that require +/-.002".  This will apply to component holes where via
locations become more variable as size is reduced.  Location tolerances
from setup to setup (ie. Primary to secondary drill will see the
accumulative tolerance - from a minimum of +/-.004" is managed well -
tooling, stack height, equipment, etc.

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: Scott Lefebvre [mailto:[log in to unmask]] 
Sent: Wednesday, May 04, 2005 6:10 PM
To: [log in to unmask]
Subject: [TN] Through hole drill accuracy

I have looked profusely at IPC-6012 for a specification I could not
find.  I need to know if there is a specification for PTH drill accuracy
and repeatability.  We have a press-fit connector we are having problems
with.  The component manufacturer tested one of our boards and said the
alignment is off 2 mils or more in some locations.  I could not find
what is the spec in IPC to reference to, could someone please point me
to the correct document I should look at.
 
Sincerely,
 
SCOTT L
 
 

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Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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the BODY (NOT the subject field): SIGNOFF Technet
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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