Hi, I am currently designing a mill that I plan on building over the next few summers funds willing. A consern with a few things has brought up a possibility of a spinning nut design for my x-axis. I already have the general layout figure out, although I am trying to figure out if the ballnuts are concentric.
Because funds probably wont allow, I wll probably go with precision rolled screws. The thing I am then conserned about is will the threads/body of the nut be concentric with the screw or will it be binding or trying to make the screw bend?
Basicly what I intend on doing is making a hollow shaft that screws onto the ballnut, use angular contact ball bearings and load them inside a housing with a timing pully on the very end. The whole assembly will probably be around 8" long or so which is not a problem with my design. I only now have the consern of whether it will be concentric.
I know homecnc does a spinning nut design for his z-axis, but its not a really fast setup, I intend to spin mine as fast as the nut will withstand or up to 3000rpm.
Let me know what you think.
Thanks,
Jon