Development Of Solids

Problem # 1 Problem # 2 Problem # 3

Problem # 1


PROBLEM 1 : A pentagonal prism , 30 mm base side & 50 mm axis is standing on Hp on it’s base whose one side is perpendicular to Vp. It is cut by a section plane 450 inclined to Hp, through mid point of axis. Draw Fv, sec.Tv & sec. Side view. Draw development of surface of remaining solid.
Construction

For sectional views :
Step 1. Draw three views of standing prism.

Step 2. Locate sec.plane in Fv as described.

Step 3. Project points where edges are getting Cut on Tv & Sv as shown in illustration.

Step 4. Join those points in sequence and show Section lines in it.

Step 5. Make remaining part of solid dark.

For Development : Draw development of entire solid. Name from cut-open edge i.e. A. in sequence as shown. Mark the cut points on respective edges. Join them in sequence in st. lines. Make existing parts dev.dark.
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Problem # 2


PROBLEM 2 : A cone, 50 mm base diameter and 70 mm axis is standing on it’s base on Hp. It cut by a section plane 450 inclined to Hp through base end of end generator.Draw projections, sectional views, true shape of section and development of surfaces of remaining solid.
Construction

For sectional views :

Step 1. Draw three views of standing cone.

Step 2. Locate sec.plane in Fv as described.

Step 3. Project points where generators are getting Cut on Tv & Sv as shown in illustration.

Step 4. Join those points in sequence and show Section lines in it.

Step 5. Make remaining part of solid dark.

For Development :

Draw development of entire solid. Name from cut-open edge i.e. A. in sequence as shown. Mark the cut points on respective edges. Join them in sequence in curvature. Make existing parts dev.dark.
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Problem # 3


PROBLEM 3 : A hexagonal prism 30 mm base side & 55 mm axis is lying on Hp on it’s rect.face with axis // to Vp. It is cut by a section plane normal to Hp and 300 inclined to Vp bisecting axis. Draw sec. views, development.
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