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TECHNICAL DRAWING AND INSTRUMENTS

What is Technical Drawing? What is the necessity of Technical Drawing?  Technical drawing or drafting, is the demonstration and discipline of composing drawings that visually communicate how something capacities or is developed. Technical drawing is basic for imparting thoughts in industry and engineering. To make the drawings more clear, individuals use familiar symbols, perspectives, units of measurement, notation systems, visual styles, and page design. Together, such conventions constitute a visual language and help to guarantee that the attraction is unambiguous and moderately straightforward. A large number of the images and standards of Technical drawing are systematized in an international standard called ISO 128.  The requirement for exact correspondence in the arrangement of a practical record recognizes specialized drawing from the expressive drawing of the visual expressions. Creative drawings are emotionally deciphered; their implications are duplicated and decided. Specia
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INVOLUTE

  Post Summarisation:   1. Definition of Involute 2. Use of Involute 3. Involute of a Circle 4. Involute of a Triangle 5. Involute of a Square 6. Involute of a Pentagon 5. Involute of a Semi Circle 6. Involute of a Pole 7. Tangent and Normal on an Involute   1. Definition: What is an Involute? When a curve traced by the end point on a straight line which rolls out without any slipping along from a circle or a polygon, such curve is called as an Involute. For simplicity, it is a curve generated by an end of a piece of thread, from roll tight around a circle or a polygon to unwound condition . Mathematically, it can be described by x = rcos8 + r8sin8 , y = rsin8 - r8cos8 , where, " r " is the radius of a circle .   2. Use of Involute: Practically, Involutes are generally used in drawing of Belt Drive, Chain Drive, Teeth Profile of a Gear , etc.   3. How to Draw an Involute of a Given Circle? Construction: (i) Draw a Circle of given rad
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PARABOLA

  Summary: 1. What is Parabola? 2. Use of Parabola. 3. Methods of construction of a Parabola. 4. How to draw Tangent and Normal on a Parabola? What is a Parabola or Parabolic Curve? When a curve is generated by cutting out a conic in such a way that the section plane is parallel to one of its generators of the conic, it is called a Parabola or Parabolic Curve .                                     Use of Parabola or Parabolic Curves Practically, in engineering drawing, the Parabolic curves are used to draw arches , bridges , sound reflectors , light reflectors , etc. Thus, it has a huge application in architectural drawing and civil engineering drawing. Methods of construction of a Parabola   (1) Eccentricity Method or General Method or Common Method It’s similar to drawing an ellipse in the Eccentricity method. Taking that same assumption into account! Draw a Parabola, where the distance between the directrix to focus is 50 mm.                            As we know, the eccent
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HYPERBOLA

Summary: 1. What is Hyperbola and how it’s formed? 2. Use of Hyperbola. 3. Methods to draw a Hyperbola. 4. What are Asymptotes? 5. How to draw or find out asymptotes in Hyperbola? 6. How to draw a Tangent and Normal on a Hyperbola? What is Hyperbola or Hyperbolic Curve and how it’s generated? When a curve is generated by cutting a conic section plane parallel to its axis, it is called a Hyperbolic Curve . As we know, a Hyperbola is a plane curve only which has two separate branches . It means a Hyperbolic curve is generated in two ways. (i) Either, when two cones are pointing toward each other and both cones are intersected by a plane that is parallel to the axes of those cones, (ii) Or, when the cutting plane of a conic section is parallel to the axis of the conic. For simplicity, the cutting plane must be parallel to the axis to generate a Hyperbolic curve.   Use of Hyperbola Practically, in engineering drawing, the Hyperbolic curves are used to draw Quench
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IMPORTANT! Short questions and Answers from Line

Short Questions and Answers from Line   1 . Lines for hidden edges are drawn as _____ Ans .  dashed lines of medium thickness (0.4 mm).     2 . Outlines or principal lines are drawn as _____ Ans .  thick continuous lines     3.  Line thickness of Continuous thick lines should be of _____ Ans .  0.5 mm     4 . Centre lines, Locus lines, and Pitch circles are drawn as _____ Ans .  long and thin chain lines     5 . Thin and long chain line is made up of _____ Ans .  alternately long and short dashes     6 . The position of the Cutting plane is shown by _____ Ans .  thick and long chain line, thick at ends only     7 . Dimension lines, hatching, and extension lines are drawn as _____ Ans .   thin continuous lines 8.  Line thickness of Continuous thin lines should be of _____ Ans .  0.3 mm     9.  A dashed line of medium thickness is made up of _____ Ans .  short dashes of approximately equal lengths     10.  The section lines are continuous _____ lines and are drawn at an _____ of _____
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Important! Short Questions and Answers from Lettering

Important Short Questions and Answers from Lettering  (Fill in the blanks with appropriate words).     1 . Writing of titles, notes, etc. on a drawing is called _____.   Ans . Lettering. 2 . Lettering is usually done in _____ letters.   Ans . Capital.     3 . The main title of the inked drawing is generally written in ______ letters.   Ans . Gothic .     4 . Efficiency in the art of lettering is achieved by continuous ______   Ans . Practice.     5 . Lowercase letters are usually used in ______ drawings.   Ans . Architectural.     6. For maintaining uniformity in size, thin and light _____ may first be drawn.   Ans . Guide-lines.     7 . The italic letters should be at an angle of _______ to the right.   Ans . 75 degrees.     8 . The smallest unit shape of a graph in lettering would be ______.   Ans . Square.     9 . ______ and _____ should be avoided during lettering.   Ans . Ornamental drawing. Dimensioning.  
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