CBSE Class 12 Engineering Tie Rod and Pipe Joints
TIE-ROD AND PIPE JOINTS WHAT HAVE WE LEARNT 1. Turnbuckle/Tie-rod Joint is an adjustable temporary joint, which connects the ends of two rods axially when they are subjected to push/pull (tensile) forces. 2. It consists of: (a) Body: A hollow cylinder with tapered ends…
CBSE Class 12 Engineering Shaft Couplings
SHAFT COUPLINGS Shafts as we have learnt in the previous chapters, mechanical/machine parts that are commonly used to transmit power from one end of the machine/unit to another. But what, if these ends are distance apart. Moreover the shafts are made of limited lengths for…
CBSE Class 12 Engineering Rod Joints
ROD JOINTS All of you have seen a tractor and its trolley/ trailer. The trolley can be easily joined or removed from the tractor as per the need. Have you ever noticed that how this trolley is joined or detached from the tractor? This work is made so simple by a joint between…
CBSE Class 12 Engineering Pulleys
PULLEYS 7.1 INTRODUCTION In every machine or toy, we use power to operate and perform its function. This power is obtained mostly by the motor, run on electricity or battery. To transfer the power from the motor to the operational part of the machine, we use a combination of…
CBSE Class 12 Engineering Machine Drawing
MACHINE DRAWING 2.1 INTRODUCTION 2.2 SCREW THREAD In our day to day life, we come across many objects where bolts and nuts are used to join two pieces together. For example we use wooden furnitures like desks, stools, tables etc. in school, showing bolts, nuts and screws.…
CBSE Class 12 Engineering Isometric Projection
ISOMETRIC PROJECTION 1.1 INTRODUCTION The objects we look, around us, are in 3-Dimensional form. When we try to communicate the structure of objects to others then we take the help of pictures / pictorial drawings. These pictorial drawings are 'one plane' drawings because…
CBSE Class 12 Engineering Bearings
BEARINGS All of you have seen a bicycle and most of you may know how to ride it. With the help of paddles you may have driven it. It needs very little effort to run a bicycle. Do you know why a bicycle runs so smoothly and easily? The reason is that friction is greatly…