Gregg Klawson wrote:
> 
> Is there an industry standard or rule of thumb when it comes to drilling
> accuracy and repeatability?  How close should 0.015 inch drilled holes be to
> where they want to be?  How consistent should the drilling be across a
> board?  Should all the outer layer lands get hit at about the same spot as
> one another?  Any enlightenment on this topic would be appreciated.
> 
> Thanks,
> Gregg
> _________________________________________________________
> Gregg Klawson                        tel: +1.508.880.1822
> GTE Government Systems Corp          fax: +1.508.880.4891
> Taunton, Massachusetts USA         email:  [log in to unmask]
> 
> ***************************************************************************
> * TechNet mail list is provided as a service by IPC using SmartList v3.05 *
> ***************************************************************************
> * To unsubscribe from this list at any time, send a message to:           *
> * [log in to unmask] with <subject: unsubscribe> and no text.        *
> ***************************************************************************
The holes should be drilled with in +- 0.002 inches of their loaction. 
The clearance hole diameter need to be considered also. The spacing 
between barrel and the inner plane ir critical from migartion view point. 
The minimum copper to copper distance should be > = 0.003 inches to 
minimize internal shorting probability.
-- 
Pratap Singh
Tel./Fax: 512-255-6820
e-mail: [log in to unmask]

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************