I'm making a steel frame router and I'm making it heavy and rigid as much as possible and this question popped up today.

Is all the work regarding machine rigidity there to deal with vibration during cutting or is there any other reason to make machine more rigid (after we pass the point of machine lossing acuracy due to flex and lack of rigidity etc.)

For example the machine frame I have attached, is this just wasteful? The cutter is going to flex 100x more than the frame... would this frame be just as good with 4 legs and 4 pipes for bracing...

English is my 2nd language and I'm sorry if I didnt get my questions across. What are your thoughts on this matter?

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