Screw

Screw Points : Screw, Definition, Construction, Working Principle, Working, Factors Affecting Mechanical Advantage Screw Screw is a simple machine and is used to hold dissimilar parts of machines together. Construction Screw consists of a threaded rod by a head. The distance among two consecutive threads called pitch. Working Principle The threads of the screw work on the principle of inclined plane. Working When a screw is turned to one revolution by an effort. The effort moves through a distance 2πd and screw moves forward into the wood through a distance equal to h. For an ideal case if there is no loss of energy then.
Input = Output
P x 2πd = W h
W/P = 2πd/h
M.A. = 2πd/h Factors Affecting Mechanical Advantage Mechanical advantage of screw depends upon following factors.
• Radius of screw
• Pitch of screw
The mechanical advantage of screw is large if the radius of screw head is large and the pitch is small.