The guy whose site is listed above...he's reported some amazing results with his. The accuracy of his is less than it could be, and he mounted his spindle on the Stewart Platform.
He reported, in his sweet zone (his most accurate, centered zone) that he was getting accuracy down to .002". He claimed overall accuracy was down to .005" all across his active area, and that was without antibacklash nuts, precision threads, etc. In fact, it was with allthread and X10 control boxes providing the interface.
He's rebuilding (version 2) with ballscrews and proper parts...I can only imagine what the accuracy of that thing will be.
Improved accuracy was supposed to be one of the benefits of this design...that errors don't add up across multiple planes, and the parallel, triangulated construction provided increased stiffness, further increasing accuracy.
This might be worth playing with!
-- Chuck Knight |