Your right.  I keep forgetting that a pad on a plane layer is a void, so 
that would be included in the clearnace.

Thanks,
Dave



At 04:20 PM 4/19/02 -0700, you wrote:
>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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