I have a 3 axis table CNC mill about 4’x3’ with a 800W water cooled spindle all made with 3/8” and 1/2" thick aluminum plate/flat bars. It’s for a hobby use and I would like to install a 4TH axis.

I do have the space to put the 4TH axis on the side of the table and modify the spindle to go over it. I will prefer to drive this axis with a stepper motor and it will be used to mill aluminum and wood.

I see quite a few alternatives on the web but since I never used one before what would be the least complicated setup?

Thanks