Re: cracked frame

"Richard Smith"  wrote in message news:[email protected]...

I take it you are proposing some feature with an abrupt "right-angled
in every way" change in thickness and possibly direction.
That will be highly fatigue-prone.

Steve I think you are being given a chance to learn and you are not
seeing it.

As best I can tell from message trail so far...

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I vaguely remember learning in Strength of Materials class that the diagonal 
weld across the beam web reduced stress concentration. Maybe the reason for 
both diamond and fish-mouth plates is that one is scrap from cutting the 
other.