What I was trying to explain was using the thread of the ballscrew itself to create the preload. If you solidly mount one ball nut, the second floating ballnut could be rotated into the fixed one with a lever and a spring (like a wrench with a constant torque applied). So, as the nuts wear in, the spring rotates the second nut a tiny bit, and eliminates the backlash. There would never be a need to adjust backlash, and the amount of preload is determined by the amount of torque you apply to the second nut. This is a trick normally used on anti-backlash leadscrews.
Neatman |