Originally Posted by freak_brain Al,
I called Allen at Roton and he told me that a 1" dia. screw for my needs would be fine. I'm figuring no more than 350"/min. and 8ft of travel. on my machine. Do you think that's bad advice? I'm kind of at the mercy of everyone else as I'm not very knowledgeable on this subject.
-Allen |
Hi, you might want to check out:
http://www.nookindustries.com/ball/BallCalculators.cfm
Especially look at the column strength calculator.
From what I can tell using a 1" diameter (~.8 root dia) screw is iffy in this situation no matter what type of end conditions or nut/screw rotation scheme you employ due to buckling danger. According to the calculator, shaft whip could also be a problem depending on what lead you choose.
So, if you are going to use a ball screw, you might consider a larger diameter one. Even the 1.5" dia ones might be pushing it if you go by the book, depending on how you fix the ends.
Another good resource for this sort of thing is the thomson ballscrew catalog (pgs 50&54 of the 2004 ed has charts that say the same thing as the nook calculators).
Good luck!
Mitchell