1. Section Plane Through Apex Section Plane Through Generators Section Plane Parallel to end generator. Section Plane Parallel to Axis. Triangle Ellipse Parabola Hyperbola Ellipse Cylinder through generators. generators. Sq. Pyramid through all slant edges Trapezium Typical Section Planes & Typical Shapes Of Sections.

2. The plane is perpendicular to the top plane, therefore the section line is drawn in the Top View It cuts the base at f and j It cuts the edges at g and h Join these points to o form the section face A pentagonal pyramid (side of base = 50 mm and height = 100 mm) is resting on its base on the ground with axis parallel to frontal plane and perpendicular to the top plane. One of the sides of the base is closer and parallel to the frontal plane. A vertical section plane cuts the pyramid at a distance of 15 mm from the axis with section plane making an angle of 50 o with FP. Draw the remaining part of the pyramid and the true shape of the cut section 50 o 15 e’ a r e a’ b’ c o c’ m’ n p m n’ p’ p1 m1 n1 r1 100The true shape of the section is drawn as an auxiliary view to the top view with the reference line parallel to the section plane Section plane 50 r’ b d d’ o’ T F

3. A sphere of 75 mm diameter is cut by a section plane, perpendicular to the FP and inclined at 30 o to the HP in such a way that the True Shape of the section is a circle of 50 mm dia. Draw its front view and sectional top view. Sphere  75  50 30 o Draw the FV (circle with dia. 75 mm) and project the TV Draw the cutting plane in FV such that it is 30 o to the HP and makes a 50 mm chord on the FV circle Draw concentric circles in the TV (center same as the center of the TV) and project them into the FV Mark the points of intersection of the cutting plane with the concentric circles in the FV and project them into the TV Join these points in the TV to get the sectional TV T F

4. A cube of 65 mm long edges has its vertical faces equally inclined to the FP. It is cut by a section plane, perpendicular to the FP so that the true shape of the section is a regular hexagon. Determine the inclination of the cutting plane with the HP and draw the sectional top view and true shape of the section 45 o Section plane cuts the Mid points of edges of cube Angle to be measured 65 T F PRIMARY AUXILIARY VIEW (True shape of the section plane) Section plane and reference line are parallel a’, d’ d a f e d1 f’, e’ a1 b’, c’ f1 b1 c1 e1 b c

5. Cutting plane is oblique x y 10 20 30 10 20 30 102030 A C B C B O1O1 O2O2 z A Draw lines across the Top View (generator lines) starting from one corner of the plane upto the opposite side (AB). Project the intersection points between the generator lines and the side (AB) into the Front View Join these points with the corresponding corner C in the FV Project points of intersection of the section and the generator lines from the TV into the FV Two generator lines should be tangent to the section in the TV to get the width of the section in the FV Generator lines T F A cylinder, diameter of base 30 mm is standing on its base on ground and positioned in third quadrant. The position of center of upper base is O 1 (25, 30, 25) and the center of the lower base is O 2 (25, 30, 75). Points A (0,60,45), B(15, 5, 70) and C(65, 35, 35) lie on a plane that cuts the cylinder in two parts. Draw the two orthographic views of the cut portion of the cylinder. The coordinates of any point (x, y, z) represent distances measured from left profile plane, frontal plane and top plane respectively.