Re: gEDA-user: Polygon islands in PCB

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Sun, 2008-08-31 at 00:27 +0000, Kai-Martin Knaak wrote:

> pcb will tolerate a linewidth set to to zero. A few months back I did 
> zero width pads with large clearance to expose some copper text. The fab 
> did not complain and the mask contained holes as expected.

Copper text (with mask) is cool - something it would be nice for PCB to
support.

(By this, I think I mean the same as KMK - the copper is solid, but the
mask is cut away with the lettering).

An undergraduate designed a board for a PWM inverter on a lab course I
was demoing, and he used this technique with Altium. Very cool I
thought, and have used it myself since. (Our in-house process has no
slik, but can do mask).

It would be nice for PCB to support text on mask layers (when the
arbitrary mask-layer contents work is done).

In my case, I didn't care about the solder-paste stencil getting the
text too. I just traced over the text I wanted with pads, called them
all "1" and saved as a footprint. I explicitly wired a dummy component
with the footprint matching into schematic's ground plane.

As it happened, the fab appears to have removed the text from the
solder-mask before producing it.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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