I wanted to be able to make threaded lids for boxes and other projects turned on my old Shop Smith lathe. The problem is that to turn threads you typically need a machine that will go pretty slowly; say between 300 and 500 revolutions per minute. Old Shop Smiths can only drop down to around 700.
So I built a threading jig that uses a 60 degree double sided cutter, a Jacob's chuck, and an odd sled jig that will hold the box parts for threading.
The video shows the build and the methods for using the jig.
For mobile users here is the link: https://www.youtube.com/watch?v=5nEnJmYK4yc
This was a fun project. Thanks for taking a look.