It seems the Friction Drive has just about met its demise as far as I can tell.
At one time there were Jam Chucks and Friction Drives. Two completely different methods. Now it seems there is just a Jam Chuck (going by most post and almost every youtube video).
The pic (turningsartgroup) is what a Jam Chuck looked like when I started turning. You hold a bowl, box, or other item by turning a waste block with a very tight fit and you can finish the bottom without tailstock support.
I would call this a “chuck” as it is made to hold the item without tailstock support (scroll, Longsworth, Jacobs, donut, collet, etc).
The other pic (turnawood bowl) is what I had always heard called a Friction Drive (until a few years ago). The last I can recall in a video was by Bob Hamilton.
Given the "friction drive" it is now called a “chuck” even though it needs tailstock support does that mean we now have four prong, two prong, steb, and safety chucks?
If a Friction Drive is now called a Jam Chuck then what is the “original” Jam Chuck now called?