The June issue of Woodturning magazine has an article titled “Creating long spindles with a join” by Richard Findley. He talks about being able to create spindles that exceed the length of the lathe bed by turning multiple sections and joining them with mortise and tenon joints. He shows his techniques for creating these types of joints.
This made me think of a recent video posted by the Northeast Florida Woodturners from their April meeting demonstration. In it Ed Malesky and Emory Mclaughlin show how to create long spindles with multiple features utilizing a different type of joinery.
You can check out the video on the Jaxturners YouTube channel. Remember that there are three parts to this video.