I use a lot of small diameter stock that comes in 3 foot lengths, that being said I had to clamp it at the exit of my spindle to keep it from whipping. First try was a three bolt arrangement that worked but was slow to adjust and I did not like the bolts sticking out and spinning. So I saw an iris device on a Cnccookbook email and modified it to this. It is thicker than it needed but I had 1/2 in pieces in my scrap box. Now I can loosen the one thumb screw, give it a twist and it self centers to any stock
I needed a new chuck key for my four-jaw chuck, so I made one. Next step is heat treating.
-Ryan
I use a lot of small diameter stock that comes in 3 foot lengths, that being said I had to clamp it at the exit of my spindle to keep it from whipping. First try was a three bolt arrangement that worked but was slow to adjust and I did not like the bolts sticking out and spinning. So I saw an iris device on a Cnccookbook email and modified it to this. It is thicker than it needed but I had 1/2 in pieces in my scrap box. Now I can loosen the one thumb screw, give it a twist and it self centers to any stock.