David, 

Typical note we use for manufacturability reasons is 

 .06 Min Radius on all inside corners... 

However... that does not mean that someone can't make a sharp corner for
you... it just means we save money on our boards by not designing in sharp
inside corners... 

In the old days we used a corner notcher shear to do sharp corners.. there
are also NC nibblers out there that are used for sheet metal that could
punch out a sharp inside corner... but I have not tried that for  various
reasons... best way to deal with it is not to design them in... 

Perhaps you relieve the corner with a drilled hole in the exact corner and
then route up to it with a standard .125 inch dia router bit... allowing it
to not actually contact the pin point corner of whatever you are mating with
it? 

Why do you need a sharp inside corner?

Bill
 

-----Original Message-----
From: David Baldwin [mailto:[log in to unmask]] 
Sent: Thursday, August 02, 2007 3:46 PM
To: [log in to unmask]
Subject: [DC] Typical Routing Bit Size - Critical Corner

DC Members:

I am designing a board that has a critical inside corner.  Can anyone 
tell me what the typical minimum routing bit that a board shop 
uses?  I need a perfect corner so I believe we will need to overshoot 
the routing to eliminate the radius, but I need to keep it at a minimum.

Thanks in advance for your input.

David Baldwin C.I.D.+

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