Arduino Shield: Mounting holes vs Fiducials?

Community PCB Design
1

I am working on a custom shield and looking at the Duemilanove reference design to match the mechanical aspects.

There are some holes that are just holes (for example position 600 2000 drill 125.984). There are also some holes that are components “FIDUCIALMOUNT” (U$1 at 776.772 2004.724).

I have duplicated both the holes and fiducials in my design. The Fiducial components give design rule violations at BatchPCB, since they have a narrow ring of copper on the top side.

The Fiducial components is from the SmartPrj library, and the package is “FIDUCIA-MOUNT”.

Are Fiducials necessary? If so, how do I get them to pass the DRC at BatchPCB?

2

Fiducials are not necessary unless you are doing automated assembly and inspection of boards (and often they can be put on the panel and not the board themselves) .