Personally I'd tell R&D to take a hike and insist on having this problem
cleared up. Remember who has to actually use these things, and how much easier it's
going to be with at least ONE less point of possible trouble. R&D in my experiance
never really gives a hoot about these sort of problems. Your correct, you should insist
this is fixed regardless of how much paperwork R&D has to do, Especially if there is no
other reason......

                P Tremewen

Michael Forrester wrote:

> 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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