It might matter in what sequence it is drawn. Especially
the printtool requires the layers in a particular sequence,
namely multilayer on top.
How to control the sequence ? I don't know.

Rene


Andrew Ircha wrote:

> Hi Doug,
> 
> That's very helpful. Let me pitch this to you...
> 
> I'd say the 0 width cross hair means, as you say, a direct connection
> (merge) into the plane. I'd say 45 degree rotation determines whether
> the cross-hair is + (90 degrees) or X (45 degrees).
> 
> I think the reason this doesn't work is that the inside and outside
> diameters overlap, and the cross hair is zero.
> 
> Owing to repeated re-generation of Gerbers (and some tweaking in
> between) I know have a file with the following two aperature macros:
> 
> %AMTHD193*
> 7,0,0,2.800,2.300,0.250,45*
> %
> %ADD193THD193*%
> %AMTHD194*
> 7,0,0,2.016,2.016,0.000,45*
> %
> 
> So D193 works (it's 2.8-2.3 = 0.5mm), but D194 doesn't work because the
> line is 0mm thick with 0mm crosshair.
> 
> I think I understand now why the aperatures aren't being read by GCPREVU
> and my board house. So, what is Protel doing? Have I set up two
> contradictory rules - if so, why does it appear ok in the PCB editor,
> and why do Gerbers imported into Protel appear ok?
> 
> 


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