Bandsaws are often talked about in terms of wheel size , 12", 14", 16", 18". I think your 315 is a 12" model. Charnwood tops out at a 14" model. Record 300=12, 350=14, 400=16, 450=18". I upgraded to a 430mm/17" model a year or so back and find it a good sized machine for both small and large...