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Hi Bob,
Thank you for the response. I have looked over IPC 2221 and can only find
the location tolerance for Class A,B or C PCB's, (table 9.3). Can I ask
you where in 2221 you found the information for second stage drill
tolerance?
Thanks again.
Tom
Tom Burek, CID+
VEHICULAR INSTRUMENTATION SYSTEMS BUSINESS UNIT
INSTRUMENTATION AND SPECIALTY CONTROLS DIVISION
287 27 Road | Grand Junction, CO 81503 | http://ametekvis.com
Phone: 970.257-2486 email: [log in to unmask]
From: "Bob Hammond" <[log in to unmask]>
To: "'TechNet E-Mail Forum'" <[log in to unmask]>, "'Tom Burek'"
<[log in to unmask]>
Cc: "'Joseph Ciukaj'" <[log in to unmask]>
Date: 06/20/2012 05:47 PM
Subject: RE: [TN] Standard fabrication drill tolerances
Hi Tom:
I believe the following comments will answer your questions. Our answers
are
based on the IPC Class 2 Specs (axial tolerance):
1st Stage (PRIMARY IMAGE) location tolerance for drilled unplated hole is
+/- .003 inch per the IPC 2221 spec.
2nd Stage (PRIMARY to Secondary) location tolerance for drilled unplated
hole is +/- .005 inch per the IPC 2221 spec.
Please do not hesitate to contact me if I can be of further assistance.
Bob Hammond- QC Manager
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Burek
Sent: Tuesday, June 19, 2012 2:20 PM
To: [log in to unmask]
Subject: [TN] Standard fabrication drill tolerances
Hi,
These questions are directed primarily at the PCB fabrication
professionals
out there, but any input is welcome.
What is the standard location tolerance for a first stage drilled hole,
(unplated)?
What is the standard location tolerance for a second stage drilled hole
(unplated)?
Lets assume IPC Class 2.
I tried looking through IPC 6012 and IPC-2221 but cold not find any
indication of what first stage drilled holes or second stage drilled
holes.
Where can I find any industry documentation used by the PCB fabricators to
identify this information?
Thank you in advance.
Tom Burek, CID+
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