Turning Archive 2005
Jim Shaver - Oakville, Ontario
I am curious how a pin chuck works. I was visiting a pen turner this past week in Arizona, he uses a pin chuck to hold a pen blank so he can turn the end of the pen with no hardware. The chuck appeared to be a bar of appropriate diameter to match the pen tube, but with a flat ground into one side of the bar stock.
The bar is captured in a small set of jaws on the head stock, but there is also a small roller bar that is inserted into the the tube and appears to sit on this ground flat section.
Apparently this combination of the small roller bar and the ground flat secon act together to capture the pen and hold it steadfast while turning...question is, I do not undertsand how this works.
Can some one explain the principle to me?