The ultimate power source is your leg. You push the treadle with your foot. The workpiece rotates. You apply the tool. At the bottom of the stroke, relax your foot. The bungee restores the workpiece. Do not cut during the return stroke, the piece is rotating the wrong way for that. Repeat.
What I am doing in the first picture is called "roughing to cylinder." I am making a rough cylinder out of the piece of branchwood I have set up between centers. This is the hardest part of the whole operation. The piece may look like a cylinder to begin with, but it ain't so. You have to go very gingerly until it is a more or less real cylinder, centered on your, er, centers. Be careful with the screw adjustment. too tight, workpiece hard to spin. Too loose, it flies off. Bummer. A little oil on the points helps a lot. Canola works fine.
Once we have the thing cylindrical, we can start shaping it. I stick with the gouge at this point. I am making a handle for a chisel and I am tapering down the business end of the handle. Thanks to John for the pic, I cannot turn and take pictures at the same time.
There are other tools you can use. The next most important tool, after a gouge(s) is the skew chisel. Then a ladyfinger gouge. I'll get to those anon.
And I have my revenge on the workmate lathe. You could easily make the bed longer. My bed was limited by the scrap piece of 2x4 I had at hand. All 2x4 scraps are now buried under a meter of snow. You could vary this lathe a lot. But I have achieved my objective, turning a tool handle on a workmate-clamped lathe. Could even clamp it in a bench vise. And finally give credit where credit is due. The original vise-mounted "pole" lathe is due to Jennie Alexander at www.greenwoodworking.com.
The lathe now has a name. It is called Polecat.
JRC very cool, do you have a video of it working?
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