There are going to be several factors that will determine how long it takes to wear out a nut. Lubrication is going to help a great deal and try not let too much dust onto the lead screw. The amount of force on the nut itself can also lead to wear. I doubt that you would have to replace the nuts once a year depending on design. I'd just use good materials and try and reduce friction anyway possible. If it really bothers you go with ballscrews. Are you planning on using a self adjusting (spring loaded) antibacklash nut or one that can be adjusted by hand? Shouldn't really matter but it's nice to see what other people are doing.
Check the forums there's an article written not too long ago about leadscrews. |