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Date: Thu, 11 Nov 2021 21:32:30 +0100
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Subject: Re: [geda-user] Removing solder mask from pads?
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Am 10.11.21 um 07:09 schrieb conover AT rahul DOT net (John Conover) [via geda-user AT delorie DOT com]:
>
> How do you remove the solder mask from the footprint of the following
> two layer SMA edge connector?
>
>      Element["" "" "" "" 423.04mil 281.42mil 0 0 0 100 ""]
>      (
>          Pad[-152.52mil 80.71mil -152.52mil -80.71mil 120.00mil 20 3 "1" "1" "onsolder,square"]
>          Pad[0.00mil 80.71mil 0.00mil -80.71mil 120.00mil 20 3 "2" "2" "onsolder,square"]
>          Pad[152.52mil 80.71mil 152.52mil -80.71mil 120.00mil 20 3 "3" "3" "onsolder,square"]
>          Pad[-152.52mil 80.71mil -152.52mil -80.71mil 120.00mil 20 3 "1" "1" "square"]
>          Pad[0.00mil 80.71mil 0.00mil -80.71mil 120.00mil 20 3 "2" "2" "square"]
>          Pad[152.52mil 80.71mil 152.52mil -80.71mil 120.00mil 20 3 "3" "3" "square"]
>      )
>
> Thanks,
>
>      John
>
>

The following should resolve the issue:

     Element["" "" "" "" 423.04mil 281.42mil 0 0 0 100 ""]
     (
         Pad[-152.52mil 80.71mil -152.52mil -80.71mil 120.00mil 20 130mil "1" "1" "onsolder,square"]
         Pad[0.00mil 80.71mil 0.00mil -80.71mil 120.00mil 20 130mil "2" "2" "onsolder,square"]
         Pad[152.52mil 80.71mil 152.52mil -80.71mil 120.00mil 20 130mil "3" "3" "onsolder,square"]
         Pad[-152.52mil 80.71mil -152.52mil -80.71mil 120.00mil 20 130mil "1" "1" "square"]
         Pad[0.00mil 80.71mil 0.00mil -80.71mil 120.00mil 20 130mil "2" "2" "square"]
         Pad[152.52mil 80.71mil 152.52mil -80.71mil 120.00mil 20 130mil "3" "3" "square"]
     )


The seventh value inside of Pad[  ] is defining the shorter side of a rectangle around the pad, which has no solder mask inside. In your case it was 3. Without a unit, 3 would result in 0.03mil, so pretty small. You could change the value to something like 130mil and the pad will be free of solder mask (for reference: the pad width is 120mil). You should also probably change the clearance around the pad, it's currently 20 so 0.2mil, however you'd only need to do this if you have a copper filled area on one of either the top or bottom layer (only used for that). However the clearance value is not the sidelength of a rectangle, it's the space on each side combined.

If you need more information on what each value does, feel free to ask.

I hope this helped.