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need bare copper

e14candies

I defined a reactangle  & also a rather strange shape polygon on layer 1

(with 100 mils clearance.  They both show up as red, just fine.  However,

since these are heat sinks, I do not want them to be covered with anything

such as soldermask..I want bare coipper here (or perhaps with solder

reflow. How do you specify this when drawing the polygon or rectanlge?

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Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

 

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  • Draw the same shape on a 'stop' layer,

     

    ..is there an easy way to copy this exactly on the mentioned layer...my

    polygon has many vertices.

    Also, the filled polygon has a much different "shape" than the drawn

    polygon due to the electrical clearance to adjacent traces, pads, vias,

    etc.  I only want bare copper for the filled (copper) area, not the total

    polygon border.   

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

  • in reply to e14candies

    On 04/21/2013 04:23 PM, Hoyt wrote:

    Draw the same shape on a 'stop' layer,

     

    ...is there an easy way to copy this exactly on the mentioned layer...my

    polygon has many vertices.

      Also, the filled polygon has a much different "shape" than the drawn

    polygon due to the electrical clearance to adjacent traces, pads, vias,

    etc.  I only want bare copper for the filled (copper) area, not the total

    polygon border.

     

    Consider that bare copper has low emissivity

    http://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html

    Having the mask over the copper will increase emissivity.

    So only remove the mask where you have the heatsink touching the board.

    Paul R.

     

     

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