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September 2009

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Subject:	Re: drill tolerance
From:	"McGlaughlin, Jeffrey A" <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Wed, 30 Sep 2009 12:51:35 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (46 lines)

Tracy -

Try the Machinists' Handbook for drilling tolerances. For general purposes +/-3mil for holes less than 125mil and +/-5mil for holes greater than 125mil will work.  Make sure you indicate whether you are specifying finished hole or drilled hole condition.


Jeffrey A McGlaughlin, CID
Engineering Designer
Battelle
505 King Ave
Columbus Ohio 43201-2693
Phone (614)424-7582

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tracy Norton
Sent: Wednesday, September 30, 2009 12:36 PM
To: [log in to unmask]
Subject: [DC] drill tolerance

I just got caught in an embarrassing situation. A client pointed out 
that I don't have drill tolerance specified on my fab notes, and wants 
it added AND referred to the specific IPC standard
I looked back at all my work as far back as to '98...and there's no 
drill dia tolerance callout!
All I need is pointed to specific standard so I can research it and add 
to notes
Thanks!
Tracy Norton

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