silkscreen incursion into Cu pads

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.