Scott, by way of explanation, lifted fiducials in the (Horizontal) HAL process are fairly common.  You'll find the probs come and go with part number changes.  On certain designs the fiducials are extremely isolated.  As a result the copper plating can get pretty high (.005" to .01" ) at the
fiducial!  Horizontal Hal is an on contact process.  Although contact is minimized and maintenance can be an issue, why wouldn't you say...add a ring of some size around the fiducial or some other type of platting robber?  This would greatly add to the manufacturability of the parts in
question.  Or, you could just fire the
board shop? (sometimes i hate this biz!)

mark


"Lefebvre, Scott" wrote:

> I have a problem with fiducials missing on our FAB's when we receive  them from the vendor.  It is random and not specific to any one  assembly.
> The boards are being HASL and this is where they are coming off during  fabrication.  The fiducial size is 0.040" circle ½ oz. Copper.  We  have other board shops that we use and I haven't had this problem.
> Getting to the Question:
> The board shop in question asked if we to increase fiducial size or  increase copper around fiducial.  I feel that this isn't the source of  the problem I don't feel that we are asking anything out of the  ordinary using 0.040" fiducial.  I would appreciate any suggestions in   this matter.
> Thank you,
>
> ADC
> Scott Lefebvre
> [log in to unmask] <mailto:[log in to unmask]>
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