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gEDA-user: Soldermask clearance



I am wanting to change the soldermask clearance for all the parts on a board to 6 mils. I would like to write a script to do this for me. I have tried googling, but I can't find much.

From "Footprint creation for the o p e n - s o u r c e layout program "PCB"", I see:

Pad [x1 y1 x2 y2 thickness clearance mask name pad_number flags]


If I replace the original pad:
Pad[-900 2400 900 2400 2400 2000 3000 "1" "1" 0x00000100]
with
Pad[-900 2400 900 2400 2400 2000 6000 "1" "1" 0x00000100]
I get way more than 6 mils clearance. How can I calculate the number to uses for silk clearance? What does that number mean? I am using pcb20050127.


The fact that the file is text is nice. I just changed the size of 200 vias in about 30 seconds with search and replace in emacs.

--
Darrell Harmon
100x100mm SBC running GNU/Linux:
http://dlharmon.com/sbc.html