Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Understanding of following points will be very much useful to construct an ellipse by eccentricity method.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
An ellipse may be constructed by the following methods:
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Ellipse is defined as a curve traced out by a point moving in a plane such that its distance from the fixed point (called focus) is always less than its distance from a fixed line (called directrix).
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Mathematically, Conic is defined as the locus of a point moving in a plane in such a way that the ratio of its distance from a fixed point to a fixed straight line is always constant.
Ellipse, Parabola, Hyperbola | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Some of the engineering applications of conic sections widely used in practice are given below.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Conic sections (or) simply conics are obtained by cutting a right circular cone at different positions as shown below.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
A cone is formed by rotating a right-angled triangle with an apex angle 'α' about its altitude as the axis. (Fig. 6.1.)
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (c): Conic Sections
Circle, Semi-circle and Quadrant of the circle are widely used in curved objects.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (b): Scales
1. Construct a plain scale to measure decametre and centimetre long enough to measure upto 3 decameter and mark a length of 2.3 decametre. Take R.F = 1/30.
Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (b): Scales
Vernier scale is also used to represent three consecutive units like diagonal scale.
Examples | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (b): Scales
A diagonal scale is used to represent three consecutive units. ie., First unit (main unit), second unit (sub unit) and third unit (sub division of second unit).
Examples | Engineering Graphics (EG)
Subject and UNIT: Engineering Graphics: Unit I (b): Scales
A plain scale is the simplest scale used to represent two consecutive units, ie., a unit and its sub-division.