[sdiy] Eagle footprints

[Tom Bugs]

You could specify in the CAM processor to have TDocu included in the 
silkscreen layer if you wanted.
(each export part has a selectable list of layers to include)
But, checking now, I see I don't have that selected in my standard 
gerber export process, so I guess I must have changed any TDocu data 
into TPlace or TNames sometime in the past.
Tom

On 20/11/2015 20:12, Richie Burnett wrote:
> A question for the Cadsoft Eagle gurus...
>
> Just finishing off a PCB here with Eagle and noticed that all of the 
> SOIC devices have no component outlines or orientation markings on the 
> silkscreen layer, only tDocu which can be printed off as documentation 
> to aid in assembly but doesn't end up in the silkscreen Gerber file.  
> All other semi packages used on this board like TSSOP, TQFP, SOT23 
> etc, have at least partial outlines and orientation markings on the 
> silkscreen layer, often with more extensive detail on the tDocu 
> layer.  I'm happy with these.
>
> Is there some reason for this?  Did Cadsoft just forget to put 
> orientation markings in the SOIC package footprints in their 
> libraries, or is there some rule of PCB design somewhere that says 
> there shouldn't be silkscreen ink under SOIC devices?  Does it 
> interfere with the correct seating of SOIC packages during reflow, or 
> can I just add silkscreen orientation marks under the device body to 
> the footprints that I'm using to aid?  I can understand not putting 
> silkscreen orientation marks under QFNs that are planar on the bottom 
> and pretty much have to be put on by machine anyway, but some 
> orientation marks on SOIC's would really help with manual placement.
>
> I realise that any marking underneath the ICs will be covered after 
> fitting and make checking device orientation difficult, but I'd rather 
> not put orientation marks outside the perimeter of the part as 
> component packing density is very high!
>
> I'm interested to hear any thoughts on this,
>
> -Richie,
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk