3/4 hp, 1475 rpm motor similar to this will provide enough grunt to do the job;
http://cgi.ebay.com.au/3-4HP-55kW-1425rpm-...=item255c88520c
with a 12' A pulley on the key of the MILL!!!!, connected via a 'V' rubber belt to 2' A pulley on the key of the MOTOR!!!!!!! should give you 1:6 gear...