If you can't, then changing the circuit to 240v is trivial; the hard
part is
running the cable and that is already done.


I am curious don't you need thicker insulation at the higher voltage
and therefore cable rated for 220V and the correct amperage?. Also what
is the amperage rating of your saw?

What ever the case you should talk to your electrical inspector or
licensed electrician, not take newsgroup advice on this,which is worth
what you paid for it.