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different grades of timber and types of timber have different strengths
a laminated beam will be stronger than a solid beam and will be less in dimension to do the job
Architects have a book showing timber strengths for lengths so find an architect and get the right advice from him
if you find that the beam will be too big for what you want, consider using a steel rhs beam and using timber as a surface finish on 3 sides
that is a common practice in building structures
If the machine is not on a very stable surface...such as concrete....this can happen particularly if the machine is now on a timber floor. The floor literally vibrates in sympathy with the machine. If however this is the same machine now showing this on the same surface then either something has come adrift inside or the stabilising in it has failed in some way or it has a bent main shaft in which case you will need a Techo service call.