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silkscreen incursion into Cu pads

autodeskguest

I've noticed that silkscreen from improperly designed parts or inadvertant

layout of nearby parts can locate silkscreen on parts' Cu pads.  EAGLE PCB

post-processing doesn't exclude this silkscreen.  Some board houses will

exclude it but they'd prefer to not have the errors supplied to them in the

first place.  Is there a procedure or ULP that will eliminate these regions

of silkscreen from the pad regions?  Thanks.  Steve Schupbach

 

 

 

  • Steve Schupbach schrieb:

    I've noticed that silkscreen from improperly designed parts or inadvertant

    layout of nearby parts can locate silkscreen on parts' Cu pads.  EAGLE PCB

    post-processing doesn't exclude this silkscreen.  Some board houses will

    exclude it but they'd prefer to not have the errors supplied to them in the

    first place.  Is there a procedure or ULP that will eliminate these regions

    of silkscreen from the pad regions?  Thanks.  Steve Schupbach

     

     

     

    All the EAGLE libraries should be designed in a proper way

    so that there is no silkscreen over copper. The Design Rules

    Check (EAGLE 5) reports "Stop mask" errors in case Silkscreen covers

    solder stop mask areas.

     

    You have either to move the (designator) texts and place them

    without covering Pads/SMDs/solder stop mask

    or change the silkscreen drawing in the library and update

    your board with the modified package. I haven't heard about

    a ULP that could do this.

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

    CadSoft Support -- hotline@cadsoft.de

    FAQ: http://www.cadsoft.de/faq.htm

     

  • Richard Hammerl wrote:

     

    Steve Schupbach schrieb:

    I've noticed that silkscreen from improperly designed parts or

    inadvertant

    layout of nearby parts can locate silkscreen on parts' Cu pads.  EAGLE

    PCB

    post-processing doesn't exclude this silkscreen.  Some board houses will

    exclude it but they'd prefer to not have the errors supplied to them in

    the

    first place.  Is there a procedure or ULP that will eliminate these

    regions

    of silkscreen from the pad regions?  Thanks.  Steve Schupbach

     

     

     

    All the EAGLE libraries should be designed in a proper way

    so that there is no silkscreen over copper. The Design Rules

    Check (EAGLE 5) reports "Stop mask" errors in case Silkscreen covers

    solder stop mask areas.

     

    You have either to move the (designator) texts and place them

    without covering Pads/SMDs/solder stop mask

    or change the silkscreen drawing in the library and update

    your board with the modified package. I haven't heard about

    a ULP that could do this.

     

     

    A technique I use for checking for S/S overlay when reviewing the gerber

    files is to view the S/S layer under an inverted version of the top solder

    mask layer. (I use gerbv on Linux for this; I presume the functionality is

    also available on other viewers.) Any S/S that covers a hole or pad becomes

    immediately apparent because it appears in the 'clear' areas of the

    inverted solder mask layer, ie, where the pads and holes are.