Mike

How about introducing the notion of concurrent engineering? That way, everyone from the
design engineer through to the final tester has his say how things should be made. Just
make it clear to your bosses that, unless something is done to overcome your problem,
you cannot be held responsible for faulty assembly due a design error that you have
already pointed out to the designer, and keep the paperwork so that you cannot be
blamed for having accepted it. Just point out to the designer and your boss the
financial consequences if a batch is made disoriented due to the designer's
unwillingness to do a bit of paperwork which would probably not cost more than just one
faulty assembly.

We, at the sharp end of production, must put our foot down firmly when designers do
stupid things, as they often do. They are not the demi-gods they often think they are,
able to rule the roost. I have been at both ends and I have seen many stupidities in my
time.

Brian

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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