What is a lead screw?

lead screw or power screw, as is also known, is a threaded rod or rod that converts radial or rotary movement into linear or direct movement. This is achieved by passing through the threaded rod corresponding to the opposite fiber sliced ​​into a movable work piece, as seen in the benches and connectors for cars. When the bolt is rotated in the lead, the working piece moves up or down the threads depending on the screw direction. The main difference between the lead screw and the conventional fastener, such as the nut and the screw, is that the lead of the lead screw is much coarser and typically square in the profile to reduce friction. When it tightens, the lid moves on the thread on the bottle until it is tight and after relaxing, it moves up up the threads until it is removed. For example, the bench consists of one movable and one static jaw. The moving jaw is equipped with an opening through which the screw is used. The semi -screw is then locked in place with a ring on a static jaw or romahim a bad habit.

When the power screw turns, the moving jaw will move up to the threaded rod until it is locked against the static jaw. When the bolt is turned in the opposite direction, the moving jaw moves in the opposite direction and reopens the badstand. Clamp "C" works on the same principle, except that it is the lead screw itself, which moves back and forward to clamp the workpiece. Either way, the lead screw converts its axial rotation to linear or back and forth.

Although the power screw works on the same principle as a simple nut and screw, the fibers used in both applications differ significantly. For example, the screw thread on the screw is from the profile V and is cut with a relatively fine or thick angle of the thread, ie the number of threads per thumb length of the screw. This arrangement increases friction caused when the matrix turns along the screw and helps to create very safe lockingAbout the effect when the matrix is ​​fully tightened. The thread of the lead on the lead screw is much coarser, ie less thread on the thumb of the screw length, creating less friction and allowing the screw to turn easier and faster, while tightening still creates safe grip. The power screw fiber profile is also usually square, which, although more expensive on the machine, creates the highest level of efficiency.