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Date: Mon, 30 Jan 2012 07:38:01 +1100
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Subject: Re: [geda-user] PCB unable to set grid increment finer than 0.0254mm
From: Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>
To: geda-user AT delorie DOT com
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Reply-To: geda-user AT delorie DOT com
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Precedence: bulk

There's only a limited selection of grid sizes available from the
menu.  To select a non standard grid you have three options:

1. Use 'g' and 'shift-g' key to increase / decrease grid spacing in 5
milli-inch steps
2. Change the grid sizes available in the menu - it's just a matter of
editing the text file "gpcb-menu.res"
Look at the Message Log window after start up to see the location of this file.
3. Change the grid size setting inside your .pcb file.  Open it in a
text editor change the grid size on the lines that read like this:

Grid[157.480315 0.0000 0.0080mm 1]

Attribute("PCB::grid::unit" "mm")
Attribute("PCB::grid::size" "0.04mm")

IIRC the first line is just legacy support, you should be able to get
away with just changing the "Attribute" lines.

-- 
Stephen Ecob
Silicon On Inspiration
Sydney Australia
www.sioi.com.au