To do this I needed a crank handle that was easy to mount quickly, very stable and allowed for precise direct rotation of the spindle. The solution was to design one from the ground up.
Here are the cad renderings of the parts. The back of the handle design has a recess and key to accept a reverse collet-like tip that will insert directly into the end of the hollow draw bar and expand locking the handle into place. I also wanted it to be beautiful so I had some fun in the design, especially with the metal basket weave grip.
|Drawbar mounted crank handle in place on WW headstock|
|crank handle cad rear view|
|Crank handle cad 3/4 view|
|Crank handle cad front view|
|All parts for the crank handle|
|the casting for the crank showing the key|
If you look closely you can see the very fine cuts in the barrel of the expanding mounting shaft
|crank with expanding connector in place|
The center shaft is threaded and the large nut pulls it into the expanding barrel causing it to grip the inside surface of the draw bar tube.
|grip assemble on crank|
|crank handle fully assemble|
|cast grip shaft and retaining nut|
I really like the way the little grip turned out and it feels great in the hand when you are using it. Great finger purchase and the inside is machined out to an exact but free spinning fit over the mounting shaft. Feels very high precision.
|grip with basket weave design in black stainless steel|
|free rotating grip assembled|
It slides in nicely and firmly grips the draw bar.
|Inserting crank handle expanding shaft into the drawbar|
|crank in place on lathe headstock|
|crank mounted on lathe|
|crank in place|