Nothing wrong in sharing a good info to Technet.

I have asked about the possible reason for open solder/crack at BGA to
TechNet few days ago. What we found out that the solder cracks are due to
dremer tool (?) used to remove the break away tabs. So watch out! Our mouse
bite with three hole with solid connection - no good design as it requires
lot of effort to remove break away tab. Hence our assembly house folks used
the dremer tool to remove break away tabs. Vibration of that tool generated
crack at the interface between board and the ball along the entire row
facing the break away tab.

Bottom line, do not use dremer tool and incorporate better mouse-bite design
with 4 or 5 holes with two corner holes half in the FR4 material so that
operator can initiate tab separation easily.

re,
ken patel

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