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Trim A Pad?

David Yackman
I have a PCB that must meet some odd mechanical requirements.  The PCB has one header and 3 spring-loaded pins.  Due to where these pins must be in relation to the board outline, one of the pin's footprint will overhang the edge of the board slightly.  I need to trim just a bit off the edge of the pin, but I haven't figured out how to do this.  There's no trim or cut feature that I could find that would allow me to trim the edge off of just one pad.  Can anybody tell me how to do this?
  • Rik Lee

     David,

     Look at the editpad boundary command (Tools > Pad > Boundary)

  • David Yackman
    Rik, I didn't find that option.  I guess I should've mentioned that I'm using OrCAD PCB Designer Professional 16.6... 
  • David Yackman
    I should also add that if I search the "documentation" I find a page describing how to use this feature, but it doesn't say which program I should use it in.  I have no option even close to what's shown in the help document.
  • steve

    The Pad boundary option is only avaliable in the Allegro license options. It's not there in OrCAD PCB but what you can do is use Tools - Padstack - Modify Design Padstack, then select the Pad. In the Options fold out menu make sure you select Instance so that this edit is only for this pad only (it will rename the padname to padname_1) then click on Edit and change the pad size accordingly in Pad Designer. Once complete use File - Update to Design and Exit and the pad will be replaced.

  • David Yackman
    Oh, that SUCKS! So, unless I'm missing something, the only way I can trim away the edge of a pad is to first draw a custom shape, import that shape into Pad Designer, add the through hole, create a new symbol, and hope it fits.  I'll have to do this three times.  It seems to me that there would be a "trim" feature kind of like in AutoCAD, but I guess not.  Maybe it's easier just to buy a Gerber editor.  Does anybody have any suggestions about which Gerber editor is the easiest to use?
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