I am trying to make outdoor bench and have problems with 2.5x3/4 mortises that are 2-3" deep. What is the best way to dig them up? Routing is not an option, no way to make it go that deep and it's getting kind of scary with long router bit.
Wood is too dense for mortising machine - it's just not going in and chisel's sharp corners just bend.
Drill press and bench chisel work but it takes an hour with 1 resharpening per earch mortise...