On wood shafts I use dual hot melt glue for tips and pine ridge archery nock/fletch glue for nocks and inserts. For wood shafts I cut them 3/4" longer than needed. I shoot a 28" draw, my arrows are 29 1/2" to the back of the point from the valley of the nock. I cut them 30 1/4". The taper will cut down 3/4".

Unless you have a high RPM motor to cut aluminum or carbon shafts then I wouldn't risk it.

After cutting the aluminum or carbon shafts to length I de-burr the inside and square the cut with a G5 tool. But if this is your first time cutting arrows for a recurve, then start them long and cut a little at a time until you get proper arrow flight. Then cut the rest to length.