correct me if i am wrong.  I recall an on  line calculator from pcb  
vendor provide the line/spacing....
      jk
On Sep 22, 2014, at 2:50 PM, Victor Hernandez wrote:

> Fellow TechNetters:
>
>    I did not receive a reply so I posted my inquiry again.   It's  
> Monday so things might be slow!  I did review IPC-2221B Table 6-1    
> Electrical; Conductor Spacing.   I guess if I have drill  
> misregistration, as long as it doesn't come closer than 2 mils,  
> it's OK!   I needs comments and/or suggestions.   This inquiry is  
> on a cross section method.  I will plan to do a flat section later.
>
> Victor,
>
> From: Hernandez, Victor G
> Sent: Monday, September 22, 2014 9:11 AM
> To: TechNet E-Mail Forum ([log in to unmask])
> Cc: Hernandez, Victor G
> Subject: Electrical Spacing, Clearance to PTH copper barrel, IPC-6012C
>
> Fellow TechNetters;
>
>    I am searching for info on electrical spacing requirements  
> between an internal conductor/Land to PTH copper barrel distance.    
> In my case it can be either drill process misregistration and/or  
> internal core misregistration.  In either case what is the closest  
> distance that a conductor/land can be to the PTH copper barrel.
>
> Victor,
>
>
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