Key:              A key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relat…

ESTIMATING:        Estimating is process of calculating the probable cost of a product before the start of manufacturing. It is an art of finding the cost, wh…

Question 1: A lot of 1000 pieces of a job costs the following:  a) Cost of material = Rs. 20000  b) Labour cost = Rs. 15000  c) Cost of tools = Rs. 8000  d) F…

Shaft:         A shaft is a rotating machine element which is used to transmit power from one place to another. The power is delivered to the shaft by some tan…

SCREWED JOINTS A screwed joint is when two or more components are joined with screws or bolts, securing them together through pre-drilled or thread…

DESIGN PROCEDURE OF KNUCKLE JOINT The dimensions of various parts of the knuckle joint are fixed by empirical relations as given below. It may be noted that a…

DESIGN PROCEDURE OF SOCKET & SPIGOT COTTER JOINT The socket and spigot cotter joint is shown in Fig. Let, P = Load carried by the rods,  d = Diameter of …

Introduction to Machine Design FATIGUE:           When a material is subjected to repeated stresses, it fails at stresses below the yield point stresses. Such…