Sometimes the propeller on a boat is called a screw & they used to be made of lead. So they would be found at the end of the propeller shaft.
screw
when lead of the screw is equal to the pitch it is called single threaded screw
The lead screw moves the turret by a precise increment for every rotation of the screw. This allows the machine to generate threads in a workpiece, to generate precise length and diameter dimensions, and to maintain a constant rate of metal removal.
screwdriver(lever), screw(screw), flagpole(pulley)
That would be a "phillips" heades screw.
screw
A lead screw is used to transfer circular motion into linear motion as the lead screw engages with a nut
when lead of the screw is equal to the pitch it is called single threaded screw
Kiomi
is a screw designed to translate turning motion into linear motion.
The lead screw moves the turret by a precise increment for every rotation of the screw. This allows the machine to generate threads in a workpiece, to generate precise length and diameter dimensions, and to maintain a constant rate of metal removal.
presuming you mean the lead screw on a lathe, used when cutting threads on the workpiece, then the screw itself is obviously fixed, but the rotation of it may be able to be changed, depending on the lathe manufacturer.
screwdriver(lever), screw(screw), flagpole(pulley)
what is a leadscrew
A lead screw is known as a power screw or translation screw, is a screw designed to translate radial motion into linear motion. They find their use in machine slides (such as in Lathe machines), Vices, Screw Presses, and Jacks etc.For more thrust applications, you require a larger diameter screw . That's because the screw is similar to a column subject to compression and tension. During compression, the screw should not bow or deflect. And during tension, the screw must support the load without failing.
the leadscrew is used for thread cutting on a lathe
Linear and rotational