Richard Gisenia wrote:

> I have been informed of a plating issue being called
> "dog boneing". What is it, and what is the cause?


"dog bone " isa term used to describe the shape of a finished plated
through-hole. it actually looks like a dog's bone.

the cause of this condition may vary from high-aspect ratio boards (but have
also seen it) when the actual geophysical setup of the tank is out of optimum
operating parameter. copper ion transfer through the hole tends to plate up
faster atop of the knee than through the actual barrel. thus the shape of a
dog-bone occurs.

when this scenario appears one should actually set-up mapping of the cell and
run a few DOE's, in order to evalute the cells functionality - mechanical -
electrical - and chemical.

reagards

Richard Fudalewski

Florida Cirtech

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