> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Olin Lathrop
> Sent: Wednesday, November 23, 2005 9:21 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Notched PCBs
> 
> gacrowell@micron.com wrote:
> > That's neat.  I like it very much.  You are limited to fairly large
> > holes though, right?  .062" or so?  Will they do smaller diameter
> > milling?
> 
> The routed channel I showed is .045" wide.
> 
> > One slight alternative I might suggest is to make the pad 
> with no drill
> > at all, rather define the 'drill' as a plated slot that 
> extends from the
> > center of the pad to beyond the board edge.  The board 
> milling then just
> > cuts straight across the slot without deviating into the 
> slot.  That way
> > the entire slot will be plated and there's no worry of edge milling
> > tolerance damaging the plaiting in the 'hole' area.  That 
> would however,
> > leave plated material at the board edge (which may/may not 
> be an issue,
> > depending on application), but you could eliminate that by 
> deviating the
> > board edge mill slightly into the slot, beveling the corners.
> 
> I don't see how "the entire slot will be plated" in this 
> case.  The routing
> is done after plating and etching, so anything routed will 
> not be plated
> between layers.  

Route the slots during the drill operation.  Plated slots are common,
but some fabricators might not like to do it.  As I said, I like what
you've got; just a suggestion.

Gary Crowell CID+
Micron Technology

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