Easy Tenon Measuring
After truing the ends of your turning blank between centers, you can mark to cut a tenon for chucks with #2 jaws on your mini lathe by placing a pencil atop the tailstock, then touching the spinning wood.
A pencil mark from top center of tailstock will produce a mark slightly larger than 1 7/8” (48mm), which is the largest tenon that will fit into the Tekna-Tool Nova midi chuck. Marking from the top flat corner of tailstock will produce a line just over 2 1/16” (52mm) for a larger tenon to go into most other chucks.
If you cut the tenon a bit smaller, it will still fit into your chuck. This pencil tricks works on 3520 Powermatic, Jet 10”x14” and 12”x 20” -- check to see if it will work on your lathe.
~ Lee Sky, Oakland Park, FL