Flutes are cool little grooves that run parallel to a turned object's long axis. Lots of people do em by hand, or have specialized machines/jigs to help them do them.
I made a quick jig to run flutes along some cool little muddlers I had turned.
Step 1: Build the Sliding Base
The lathe at techshop has a handy gap that runs along its bed for the tool rest to slide along. I used this gap to put a guide on and keep my jig from tipping over.
One piece of wood, cut exactly the width of the gap (2.5") and 6 inches wide forms the guide. Another piece, slightly larger (3"), goes underneath the bed and keeps the jig from tipping over or sliding out.
The gap was 1.5" deep, so I made another piece 2.5" wide, and slid it in between the two. However, it needed some sanding down to keep the slide flush with the top of the lathe bed.
Two pieces of threaded rod slid through all three pieces are for tightening your jig down. (with a nut on the backside or glued to the 3 pieces)
This whole slab slides up underneath the lathe bed and fastens to your jig