On Monday 30 May 2005 03:22 pm, Glenn Jones scribbled:
> It seems odd that the first reply to a thread would be "WTF?". There
> are many threads where I have no clue what the OP is talking about,
> but after a few responses, I learn what is being discussed. Anyway, it
> seems like a waste of time to generate such a reply.
> As it happens I just learned the sense of the word fiducial that I
> think the OP using the other day.  It just means a reference point.
> Unfortunately, I have no idea what sort of standard reference points
> are used in PCB manufacturing, but it seems to me it would be easy to
> make a library of whatever pattern you needed.


I would think it would be well understood in this forum, but if not, I agree 
about the response.  The best I found is here...
	http://www.tkb-4u.com/articles/other/fiducial/fiducial.php

But one of the CM's I'm currently working with asked me to add these to a 
board we've been working on, and at first I thought it would be 
straightforward.  But on further investigation, I wonder if there is a 
standard, and a simple way to add this in eagle.  Can't reach them today 
(holiday), and hoping to get this done today before I leave town for the day 
tomorrow.

Looking at what that page shows as "common used fiducials", it raises the 
question as to how the machine differentiates these from pads, etc?  Is it 
the shape?  The size?  A specific pattern?  That there is an area of no 
soldermask around it?

Cheers,
-Neil.


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