I made a table saw sled for making segmented rings for woodturning, based heavily off of Stephen Ogle’s design. I’ve got an upcoming project the requires some segmenting and I’ve been meaning to do this for some time now.

Update 2017-04-22: While this does work very effectively, I may in the future try a different style, called a wedgie sled. It is simpler to build and more-easily adjusted.