What are Machine Elements?
Channel: MechanicaLEi
Date: 2018-12-19

Welcome back MechanicaLEi, did you know that even the simplest of machines are made using machine elements? This makes us wonder, what are Machine Elements? Before we jump in check out the previous part of this series to learn about What Solid Geometry is?
Now, Machine elements refer to an elementary component of a machine. These elements consist of three basic types: First, structural components such as frame members, bearings etc. Second, mechanisms that control movement in various ways such as gear trains, belt or chain drives and third control components such as buttons and switches. Orthographic projection is a means of representing three-dimensional objects in two dimensions. There are many times when the interior details of an object cannot be seen from the outside. We can get around this by pretending to cut the object on a plane and showing the "sectional view". The sectional view is applicable to objects where the interior details are intricate and would be very difficult to understand through the use of hidden lines. 
The true projection of a threaded portion of a part consists of a series of helices and it takes considerable time to draw them. Hence it is the usual practice to follow some conventional methods to represent screw threads. In this method, the crests of threads are indicated by a continuous thick line and the roots, by a continuous thin line. For hidden screw threads, the crests and roots are indicated by dotted lines. For threaded parts in section, hatching should be extended to the line defining the crest of the thread. In the view from side, the threaded roots are represented by a portion of a circle, drawn with a continuous thin line, of length approximately three-quarters of the circumference.
Hence, we first saw what Machine Elements are and then went on to see how threaded parts are represented in sectional views?

In the next episode of MechanicaLEi find out What thread designation is?


Attributions:

Doh De Oh by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100255
Artist: http://incompetech.com/

Subtle Library by Fabian Measures (http://freemusicarchive.org/music/Fabian_Measures/) is licensed under a Creative Commons Attribution licence ( https://creativecommons.org/licenses/by/4.0/)
Source: http://freemusicarchive.org/music/Fabian_Measures/Emotion_Music/Subtle_Library