The terminology for the clearance rule can be a bit confusing.

The clearance you are specifying is not an expansion to clear a pad, it is 
an expansion to clear the hole.

When you generate Gerbers, you do not get a pad with a clearance ring 
around it on the planes, you get a void around the hole.  A clearance of 
10mils would give you a 10 mil annulus around the hole.


At 03:01 PM 4/19/02 -0700, you wrote:

>Has anyone noticed that you get exactly half the clearance you specify on 
>a power plane clearance rule?  In other words to get a 10 mil ring around 
>a pad or via that does not connect to the plane, you have to specify a 
>clearance of 20 mills.
snip

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