国 上海文通大学 Lead Screw(传导螺杆) ▣Lead screw Lead screws are essentially accurate screws used to move a nut attached to a load,and they have been used for centuries to convert rotary motion into linear motion Lead screws are commonly used on manual economy machine tools > Efficiency in a lead screw system may be 30-50% © 上海充廷大学 Ball Screws(滚珠螺旋) Ball screw is similar in function to lead screw.Sliding contact between the screw and nut is replaced by rolling contact using recirculating spherical balls,reduce the thread friction.do not suffer from the stick-slip characteristics of sliding joints Leads to higher efficiency,may have 95%efficiency >However,not self-locking. >Have a more limited fatigue life,but have very high load nitonis capacity 44 Lead Screw(传导螺杆)  Lead screw Lead screws are essentially accurate screws used to move a nut attached to a load, and they have been used for centuries to convert rotary motion into linear motion  Lead screws are commonly used on manual economy machine tools  Efficiency in a lead screw system may be 30-50% Ball Screws（滚珠螺旋）  Ball screw is similar in function to lead screw. Sliding contact between the screw and nut is replaced by rolling contact using recirculating spherical balls, reduce the thread friction, do not suffer from the stick-slip characteristics of sliding joints  Leads to higher efficiency, may have 95% efficiency  However, not self-locking.  Have a more limited fatigue life, but have very high load capacity