MECH ENGINEERING DRAWING

Post Summarization: ● Introduction. ● Size of drawing sheets. ● Margin. ● Borderlines. ● Title block. ● Rules for selecting Titles. ● Revision Table. ● Notes. ● Tutorial Videos (Coming Soon!) INTRODUCTION: A drawing sheet consists of an engineering drawing and must have some other aspects too i.e. Border lines, Title block, Notes, etc for better demonstration of the drawing. The layout of border lines and title blocks should always be done in some specific manner on the drawing sheet as it's not only a necessity for increasing the visual orientation of the drawing sheets, moreover, these help to read the drawing sheet more speedily in a systematic way. SIZE OF THE DRAWING SHEET: The size of the drawing sheet in detail can be found in the  TECHNICAL DRAWING AND INSTRUMENTS of this blog. MARGIN: Margin or Marginal lines are drawn on the drawing sheet only where the untrimmed size of the drawing sheet is provided. Generally, in the paper industry, trimmers are used to trim drawing sh

  Post Summarization: ● Conics. ● What is ellipse. ● Definition of ellipse. ● Examples of ellipse existing practically. ● Definition of parabola. ● Definition of Hyperbola. ● Major axis. ● Minor axis. ● Directrix. ● Vertex. ● Co-vertex. ● Focus or Foci. ● Focal Radii (singular, Radius). ● Focus Angle. ● Eccentricity. ● Tangent and Normal to an ellipse. ● Methods to draw an ellipse. ● Tutorial Videos (Coming Soon!) What is Conic? The sectional plane obtained by the intersection of a Right Circular Solid Cone, relative to its different positions and concerning the axis of the cone, is called Conic . Conic can be four (4) types: (1) Circle : When the sectional plane is perpendicular to the axis, parallel to the base, and cuts all the generators, the section is a Circle . We've previously discussed in detail about circles .   (2) Ellipse: When the sectional plane is inclined to the axis and cuts all the generators, the section is an Ellipse . (3) Parabola: When the sectional plane i

  Post Summarization: ● Definition of circle. ● Diameter. ● Radius. ● Circumference or Periphery. ● Arc. ● Chord. ● Segment. ● Sector. ● Quadrant. ● Tangent and Normal. ● Concentric circles. ● Eccentric circles. ● Tutorial videos. Circle (Definition): A plane figure bounded by a curve which formed by a Locus of a Point that rotates on a path so that it is always at a fixed distance from a stationary point (Centre point). Terms Used In Circle: Some terms are frequently used in circles. These are as follows: Diameter:   The length of a straight line between two points on the curve and passing through the center point of the circle is called Diameter . It is denoted by ' D ' or ' d ' or ' Φ ' (Phi). Radius: The length of a straight line, between any point on the curve to the centre point is called a Radius . It is half (i.e. D/2) of the diameter. Radius is denoted by ' R ' or ' r '. Circumference Or Periphery: The linear length of the entire curve

Post Summarization: ● Thales Theorem and its proof. What is Thales's Theorem? If a straight line is drawn parallel to a side of a triangle, then it divides the other two sides proportionally. Given data, In ∆ABC, DE || BC Aim to prove: AD/DB = AE/EC First of all, join 'D' with 'C' and 'E' with 'B' with straight lines. Next, draw 'EL' perpendicular (90°) to 'AB' and 'DN' perpendicular (90°) to 'AC'. Now, as 'EL' is perpendicular (90°) to 'AB', therefore, 'EL' is the height of ∆AEL and ∆DEL. Again, ∆DEL and ∆BDE have a common apex point 'E', and the base of both triangles are on the same plane, Therefore, 'EL' is the height of ∆BDE. Similarly, 'DN' is the height of ∆CDE. As we know, the area of a triangle = 1/2×b×h Where,  b = Base of the triangle, and  h = Height of triangle. Therefore,  AREA of ∆ADE / AREA of ∆BDE = (1/2×AD×EL) / (1/2×DB×EL) = AD / DB    ................

  Here, in this post, you'll read the rest topics from Geometric Constructions below... (6) To divide a circle. (7) To trisect (Divide into three equal parts) an angle. (8) To draw an arc with a given radius. (9) To draw tangent and normal. (10) To draw continuous curve. (11) To construct an ogee or reverse curve. (12) To draw a loop of three (3) circles pattern. Now we'll discuss them one by one... (6) How to divide a circle into 8 or 12 numbers of equal sectors. (i) A circle is divided into 8 numbers of equal sectors: Let's consider a circle with any convenient radius. As the total angle inside a circle is 360° and there are a total of 4 quadrants in a circle, so each quadrant should be of (360°/4 )= 90° (See figure below). Now, the number of divisions should be equal to 8. So each sector should be of 45° (i.e. 360°/8=45°). 1.  Draw a circle with any convenient length of radius and draw its axis lines AB & CD (See above image). * Axis lines (one pair of imaginary line