Yes.  When using auto placement equipment that employs a vision system, and
especially surface mount equipment, they provide an excellent reference
point for the machinery to determine any skew in the PCB.  If there are no
fiducial's, a plated through-hole or other pad may be used, but solid pads
provide the best contrast for the vision system.  In addition, fiducials
are usually placed at the far edges of the PCB and  thus demonstrate the
extremes of any misalignment.

Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
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                    Sivaraja K Chakka
                    <sivaraja_chakka@AG        To:     [log in to unmask]
                    ILENT.COM>                 cc:
                    Sent by: TechNet           Subject:     [TN]
                    <[log in to unmask]>


                    11/04/2003 06:41 AM
                    Please respond to
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                    sivaraja_chakka






Hi,

Can any one explain the necessity of fiducical!

Regards
Siva

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