> OK, let's work on the assumption that you do know
> what you're talking about...

School course on Physics might help you to get rid of the need in any
assumptions about other people knowledge :-)


> So then the same principle applies to a plated hole,
> when subjected to repeated hot/cold cycles the pin
> loses contact with the pad, except where there is
> little solder b/w the pin and the hole wall?

In the case of plated hole there is no solder "bulb" around the pin.
The width/depth of solder around the pin is only fraction of
millimetre. Such thin layer would produce very little shear stress
between the solder and the connector's pin. The solder joint would
crack not in, say, 10 months, but rather in let's assume, 100 years.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist