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Subject:	Re: PWB Fab Note Question - Diameter True Position
From:	"Crepeau, Phil" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Fri, 7 Dec 2001 13:03:34 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (53 lines)

hi,

true position can be expressed as a radius or a diameter.  possibly this is what your dimension is telling you.

phil

-----Original Message-----
From: Scott Kauling [mailto:[log in to unmask]]
Sent: Friday, December 07, 2001 12:01 PM
To: [log in to unmask]
Subject: [TN] PWB Fab Note Question - Diameter True Position


In IPC 2221 section 9.2.2 describes hole location tolerance, it is
expressed as "diameter about true position".  IPC T-50 defines "true
position", not diameter about true position.

My questions are:

        1. How does the diameter about come into play with the true position?

        2. What tolerance of diameter about true position do you specify on your
fab prints

        3. What is the typical capability of diameter about true position that PWB
fabricators hold?

Thanks in advance for your input.

Have a good weekend!

Scott Kauling

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