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Cylinders
Department Department
of of
TechnologicTechnological al
EducationEducation
Gra
phic
G
raphic
C
om
munic
ati
on
Com
mu
nic
ati
on
Cut Cylinder
The views show the Front Elevation and part Plan of a cut Cylinder
Department of Technological EducationDepartment of Technological Education
Finding position of End Elevation
Draw the outline of the End Elevation.
The dimensions for the End Elevation should be projected from the Elevation and Plan.
Department of Technological EducationDepartment of Technological Education
Finding Generators on Plan
Divide the Plan into 12 areas by using 30o and 60o lines.
Department of Technological EducationDepartment of Technological Education
112
11
10
9
8
76
5
4
3
2
Number each of the points found
Drawing Generators onto Elevation
Project each of the points from the Plan onto the Elevation base.
Department of Technological EducationDepartment of Technological Education
3
112
11
10
9
8
76
5
4
2
9108
117
126
15
243
Number each of the points on the Elevation making sure that the numbers correspond with those on the Plan.
Drawing Generators onto End Elevation
Repeat the previous process for the End Elevation.
Department of Technological EducationDepartment of Technological Education
675
84
93
102
11112
112
11
10
9
8
76
5
4
3
2
9108
117
126
15
243
Make sure that the numbers used are correct and that they correspond to the numbers used on the Elevation and the Plan.
Finding points for cut surface on End Elevation
Project where the generators on the Elevation cross the cut line of the Cylinder over to the correct lines on the End Elevation.
Department of Technological EducationDepartment of Technological Education
3
112
11
10
9
8
76
5
4
2
Indicate each of the found points with a small dot.
9108
117
126
15
243 67
584
93
102
11112
Drawing cut surface on End Elevation
Draw a smooth curve through each of the 12 points found.
Department of Technological EducationDepartment of Technological Education
112
11
10
9
8
76
5
4
3
2
Darken the outlines of the End Elevation.
9108
117
126
15
243 67
584
93
102
11112
Development of Cylinder (1)
Draw a base line for the Development. If possible make this line level with the base line of the Elevation and End Elevation.
Department of Technological EducationDepartment of Technological Education
112
11
10 2
9
8
76
5
4
3
Step off the distance from each of the points on the Plan onto the Development base line.
Draw a line to indicate where the first generator of the Development will go.
9108
117
126
15
243 67
584
93
102
11112
Development of Cylinder (2)
Draw generators through each of the points found.
Department of Technological EducationDepartment of Technological Education
112
11
10
9
8
76
5
4
3
2
9108
117
126
15
243 67
584
93
102
11112
3 321121110987654
Number each of the generators. Choose carefully where to cut the Cylinder. It is normal to choose to cut the Cylinder on either the longest or the shortest generator.
Development of Cylinder (3)
Transfer each of the points from the generators on the End Elevation onto the correct generators on the Development.
Department of Technological EducationDepartment of Technological Education
112
11
10
9
8
76
5
4
3
2
9108
117
126
15
243 67
584
93
102
11112
9 987654321121110
Indicate each of the points with a small dot.
3 4 5 6 7 8 9 10 11 12 1 2 3
Development of Cylinder (4)
Draw a smooth curve through each of the points found on the Development.
Department of Technological EducationDepartment of Technological Education
Darken the outlines of the rest of the Development
112
11
10
9
8
76
5
4
3
2
9108
117
126
15
243 67
584
93
102
11112
9 9876543211211109 9876543211211103 4 5 6 7 8 9 10 11 12 1 2 3
