Hey guys,
Got a weird one here. I'm doing a four-layer board (basically finished) and I've been tweaking up the power planes and things in the final check. I noticed something that seems very odd. In the Rules, I have the default "20 mils" set for Plane Clearance. Around all of my smaller holes (e.g. 20 mil vias), when viewing the power planes, the clearance pullbacks on the power planes are just fine. When I look at some larger mounting holes, though, such as 120 mil for DB-25 connector stress reliefs, the clearances (though still set 20 mils) are hardly even visible! The larger the hole gets, the thinner the clearance around it - it's like the clearance is NOT proportionally scaling to the hole size!
If I temporarily change the Plane Clearance rule to, say, 50 mils, all of the smaller holes get extremely overkill clearances (obviously) but then at least a thin line appears around the larger holes.
I've had multi-layer boards manufactured before (under 99SE) using these same exact parts and clearance rules, and didn't have a problem with them, which is making me wonder if this is a Protel display problem, or if my board house caught it and pulled them back more. I'm about to generate a set of Gerbers to look at to see if this is a legitimate output problem, or just an on-screen display problem.
Anyone had this one happen before? Suggestions?
Regards,
-- Matt
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