On 2 Aug 2012 at 9:43, Dave Schaefer wrote:
[...]
Hmm... I've learned to use a separate layer with board outline only 
and to avoid any ambiguous stuff on other layers. Maybe some copper 
corner marks for the board corners, but normally no outline on copper 
layers.

[...]

> Here's something to ponder ... if your fabricator has a CAM department
> who has difficulty removing a simple unwanted board outline during
> tooling do you really want them building your design?

That's often not the question. If purchase department decides to go 
to a cheap but maybe not so smart manufacturer who doesn't care at 
all about board outline on all layers (read: CAM ignores them and 
keeps them as copper without any requests >> copper chips around 
board edge :-( ) we get a problem later. Any alignment features out 
of board outline don't harm, no matter whether CAM people use them as 
planned or remove them and make something else for alignment. If they 
need a board outline and (seldom enough) cannot use the separate 
layer with board outline and nothing else, they will (hopefully) send 
a request.

I try always to make my CAD data as foolproof possible......

Best regards
Matthias Mansfeld
--
Matthias Mansfeld Elektronik
* Printed Circuit Board Design and Assembly
Neithardtstr. 3, D-85540 Haar, GERMANY
Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
E-Mail: [log in to unmask]
Internet: http://www.mansfeld-elektronik.de


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