Step 3: Cut 3" in on each side

Picture of Cut 3
chop jig.jpg
There's probably a better way to do this (like a band saw), but I set up a jig on my chop saw. You SHOULD cut slightly to one side to compensate for the blade thickness, but I will just fill in this gap with washers.

Note that the chop saw will not cut 3" straight all the way down, I had to flip the boards over and even then, there was a "V" shape left inside.