圆上泽文大学 Torque Loading Power screws are used to move a load >Thus,we need to determine the torque required to raise a load and that to lower a load. Represent all the forces acting along one thread region as the summation of these forces F. In order to move the load Head Lever >a force,P must be applied to it. q.threaded rod Power screws often use Square or Acme thread © 上游充通大￥ Square thread-Load Raising To raise the load-tighten a screw or bolt >P must push the load up the incline >a frictional force will work against it. To lower the load-loosen a screw or bolt >P must push the load down the incline >The frictional force will work against it,so in the opposite direction than before. (a) (b) 2020 Torque Loading  Power screws are used to move a load Thus, we need to determine the torque required to raise a load and that to lower a load.  Represent all the forces acting along one thread region as the summation of these forces F.  In order to move the load a force, P must be applied to it. Power screws often use Square or Acme thread  To raise the load – tighten a screw or bolt P must push the load up the incline a frictional force will work against it.  To lower the load – loosen a screw or bolt P must push the load down the incline The frictional force will work against it, so in the opposite direction than before. Square thread——Load Raising