We have designed a custom BGA device with a symmetrical ball design.  The
substrate is a dark color and one corner of the device
is cut off to show orientation.  My concern is that the optics in the
pick-&-place may not pick up the cut corner due to contrast problems.
In looking at a display of what the camera saw, looking at the part, the outside
perimeter of the part was barely visible if at all.  I was using
a MyData My19 machine.

If the tray holding the parts is loaded incorrectly I feel the machine will
incorrectly place the parts.  My suggestion was to add a ball to make
the design non-symmetrical.  I am getting a strong opposition from R&D to add
the extra ball because of the paperwork involved.  We are still
in prototype stage of the design and want to correct any problems now before
production starts.  This part needs to be placed using various
manufacturers machines.  Are my concerns unfounded or should I be concerned and
fight to have the ball added?

Best Regards,

Mike Forrester
LeCroy Corp

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