One drill file with  both (non plated and plated) type of holes is the 
     most widely used format.  Even if you decide to send two files your 
     board vendor will combine them in one file to fabricate the board.  
     The only exception to this rule is if you are drilling the non plated 
     through hole through a large copper area without providing any 
     clearance for this hole on outer layers.  In most cases this is not 
     true and the board fabricator drills all the holes during there first 
     drill operation.  The other problem with all plated through hole on 
     the board is that the fabricatoe needs at least 3 non plated through 
     hole to  pin the board during there final routing operation.  Use of 
     plated through hole for pinning may result in scratches in the barrell 
     of the holes used for pinning.  In nut shell you should use  non 
     plated holes in the design and you can supply only one drill file with 
     all holes( Plated and NPTH)


______________________________ Reply Separator _________________________________
Subject: Drill files for Plated/Unplated Holes
Author:  [log in to unmask] at corp
Date:    9/26/96 08:19 PM


John Laur wrote:
> What is preferred from the fabricators point of view: 
> 
> One drill files containing both plated and non-plated holes? 
>                            or
> Two drill files one plated the other non-plated?
     
On a related note, many design texts suggest using unplated .125 
tooling holes on every design, but our lead designer here wants 
to try to make ALL HOLES PLATED on our designs because he heard 
that it saves processing steps. When I asked a board vendor about 
it, he said it USED to be true that more steps were needed for 
designs with unplated holes, but not anymore. 
     
There are designs where I need unplated holes, no matter how much 
more difficult it is for the fab house, but other designs could 
go either way (no tooling holes on hand-assembled boards, for 
example). Does it really make a difference to the fabricators?
     
Also, I have never heard of sending two drill files... do people 
really do that?
     
confused by too many opinions and no facts...  Jack
     
(p.s. I hope nobody minds the carbon copy to the DesignerCouncil, 
since I'm sure they would be interested in your responses)
     
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