router sound proofing

[Tenson]

Do you mean enclosing just the router spindle itself, or the whole CNC machine? The cutter head itself makes a lot of noise when going through material.

I made an enclosure for my whole machine. Simple box made of 12mm plasterboard and some acoustic foam tiles inside. The plasterboard isolates the sound, but then it needs to dissipate so the foam helps there. A double layer plasterboard with 'quiet glue' in the middle would help a lot. You must understand that *any* gaps and holes significantly decrease sound proofing, as do windows, vents etc..

I sealed all doors on my enclosure with draft excluder strip. As soon as the door opens a few cm the sound isolation is gone.

I don't have a vent, but firstly the enclosure is large (to fit floorstanding 600m x 1200mm router) so there is a good capacity of air to circulate and secondly the dust extraction is in effect a vent pulling air out of the enclosure at a fast rate. Spindle is water cooled.

A book such as master handbook of acoustics or recording studio design might help with the fundamentals of sound proofing :) The latter probably gives more details on isolation practices.