I have a locking index wheel built into my Craftsman lathe and it works well but it is set at every 15 degrees. In an effort to make 5 or 10 equal divisions, I found I needed another index wheel so I decided to add it to back of the lathe chuck. I used aluminum but hardwood or steel would have worked too. I was wondering what I had in my shop that was accurate for setting degrees and pulled the Wixie box(Grizzly version). I mounted a steel bar on the plate for the back of the chuck so the Wixie would hold there.
I mounted the plate in an indexing head I made for the mill and used the Wixie to set it in the right position.
Then I made a stand out of some steel pipe and a nylon sleeve that was threaded for a locating pin to go into the index holes and had a slot to go around the wheel to counter the torque.
The knob is made of jarrah and I got to use my wood knurling tool to add a grip surface.
With the wheel locked in place, I center drill holes for the pattern at 72 degrees apart.
Then I turned a sample piece to see how close it came to what I wanted. I checked the hole spacing and 2 were .020” out for the worst error.
This is what it looks like in action. You just focus on the center pattern
And this is the finished piece made from 1/2” x 8” plywood and painted flat black. It is best to use hardwood because the plywood fuzzes a lot.
-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!