Mini mill vibrates a lot

"bolted to the table" is your problem here... the machine seems to be operating fine otherwise.

being bolted to a large flat surface such as a table top or workbench (especially thinner wood and metal) effectively means its turning that surface into a large speaker. (you can hear the low wub wub-ness of it, like a subwoofer)

the rubber matting will mitigate this somewhat but there will still be solid bolts transfering vibrations. you can get proper isolating feet/mounts or maybe make a sturdy metal stand for it that you could bolt directly to a concrete floor.
 
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