What is a coupling? A coupling is a mechanical device which is used to hold two rotating shafts together. It is a permanent joint, unlike clutch which can be disengaged on the will of operator. With the help of couplings, we can join two shafts which are intersecting, colinear or parallel (with a small distance).… Read More »
What is Key? A key is a machine element which is used to connect a shaft to other machine elements like Gears, Pullies, Couplings, Sprockets or Flywheels. Its primary function is to prevent relative motion between connected parts. Functions of the a key It has two basic functions Transmit torque from the shaft to hub… Read More »
What is a Rivet? A rivet has a cylindrical shank with a head at one end. It is used to make permanent joints between two plates. Rivet is inserted into the holes of plates (which are to be joined) and then its protruding part is upset by a hammer. Joints made with rivets are known… Read More »
Threaded joints Threaded joints are defined as separable joints which are used to hold to machine parts together by means of threaded fastening such as bolt and nut. Features of threaded joints From the above definition we can find some features of them and they are. They are detachable joints which means when required the… Read More »
Recirculating ball screw A recirculating ball screw consists a screw, a nut and a series of balls. The main difference between a recirculating ball screw and a power screw is that in former the sliding friction gets replaced by rolling friction. Since rolling friction is very less than sliding friction recirculating ball screw has very… Read More »
What is a power screw? A power screw is a mechanical component which is used to convert rotary motion into the linear motion. Sometimes a power screw is also known as translation screw. It uses helical motion of screw to transmit the power rather than holding the parts together. Applications of power screws It is… Read More »
What is residual stress? Stresses can the broadly classified into two parts. Load stresses Residual stresses Load stresses are those stresses which remain within elastic limits and are induced due to external forces. When these forces are removed these stresses also become zero. Load stresses can be easily calculated from the equations of strength of… Read More »
In this article we will discuss hot and cold working process of metals. First, we will learn hot working and then we will learn cold working of metals. Before moving further let us understand concept of recrystallisation, it would be very helpful to us later. What is recrystallisation temperature? The temperature at which new stress-free… Read More »
What is fiber reinforced plastic? Fiber reinforced plastic (FRP) is a type of plastic in which the strength of low strength plastic material is increased by means of high strength of fibers. Fiber reinforced plastics contains to main things one is matrix and another is fiber. The function of matrix is to support and hold… Read More »
What are ceramics? The word ceramics is derived from the Greek word keramos which means ‘potter’s clay’. However, many compounds which are classified as ceramics today contain no clay. Modern Ceramics can be defined as the compounds of metals and non-metals. They generally have ionic atomic bonding between them. Traditional ceramics include insulating materials, glass, refractories,… Read More »