Hola Carlos,

As Clive says, dont bother. If it is just cutting out letters you want, then it is better to get a laser cutter with around 80W for the 1/2" thick ply. If you cut pine, then you should be able to cut 1/2" with 50W.

I have a 3040T and would not use it for anything apart from engraving plastics. There are versions with a water cooled spindle but these are let down by the rest of the machine.

Regards