There is another problem with this rule If I am correct, it is indeed, a hole clearance. But true clearance will be about 3 mils less, more or less, because the holes are drilled oversize so that 1.5 mils of plating (1 oz) will bring it back to the specified size. That is a conductive reduction of the clearance. It can be even larger because fab houses drill within a range in order to meet specified hole tolerance.
In other words, if you specify 10 mils annulus, you actually get 8.5 mils *nominal* minus fab tolerances. Thin, too thin, usually. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
