MT8-2 PRESNTATION

ALL ABOUT SCREW THREADS

• a long, thin strand of cotton, nylon, or other fibers used in sewing or weaving.

APPLICATIONS

• Fastening Fasteners such as wood screws, machine screws, nuts and bolts. Connecting threaded pipes and hoses to each other and to caps and fixtures. Gear reduction via worm drive.

Handedness

• The helix of a thread can twist in two possible directions, which is known as handedness. Most threads are oriented so that the threaded item, when seen from a point of view on the axis through the center of the helix.

THREADING TOOLS

• Threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element.There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as 3D printing); or combinations thereof.

AKA:Taps and dies

• Threading tool aKa tap and die: Taps and dies are tools used to create screw threads, which is called threading. Many are cutting tools; others are forming tools. A tap is used to cut or form the female portion of the mating pair (e.g., a nut). A die is used to cut or form the male portion of the mating pair (e.g., a bolt).

APPLICATION

• Application : the cross-sectional shape of a thread is often called its form or threadform (also spelled thread form). It may be square, triangular, trapezoidal, or other shapes. The terms form and threadform sometimes refer to all design aspects taken together (cross-sectional shape, pitch, and diameters).

HISTORY

• While modern nuts and bolts are routinely made of metal, this was not the case in earlier ages, when woodworking tools were employed to fashion very large wooden bolts and nuts for use in winches, windmills, watermills, and flour mills of the Middle Ages; the ease of cutting and replacing wooden parts was balanced by the need to resist large amounts of torque...