Re: gEDA-bug: PCB: DRC does not correctly check pad clearance

[Kai-Martin Knaak <kmk@xxxxxxxxxxxx>]

Zafi Ramarosandratana wrote:

> I'm using PCB 20091103-02 on Ubuntu 10.4.
> 
> DRC does not find the following simple error.
> 
> I put an element (footprint: SO8) inside a polygon. One pad is defined as
>      Pad[-13500 -7500 -7000 -7500 2000 1000 3000 "1" "1" "square"]
> 
> It means that the distance between pad and copper is 5 mil.
> 
> I declare in the Design Rules Checking
>      Minimum copper spacing: 6 mil.
> 
> When running DRC, the checker finds no violation. It only prompt
> errors when DRC minimum copper spacing is set to 10 mil.

I can confirm for fairly recent versions of pcb and pcb+gl. 
In your example, DRC starts to complain at 7.1 mil. That is, 2 mil 
too late. The discrepancy grows as the clearance grows. With an 
11 mil gap I had to ask for 14.1 mil minimum distance to receive
DRC errors.

Please file a bug report at launchpad:
	https://bugs.launchpad.net/pcb/+filebug

---<)kaimartin(>---
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Kai-Martin Knaak
Email: kmk@xxxxxxxxxxxxxxx
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