INTRODUCTION TO AUTOCAD 1
TECHNICAL DRAWING MEC 112 week 1
WEEK (15)
15.0: Intersection of cylinder
When two or more hollow objects (i.e. two cylinders) are connected together, a
line is formed to the junction of their surfaces; this line is called the "Intersection
line ". In Fig. (15) these lines are indicated as X – X.
The shape and size of the intersection line depends upon many factors such as:
- Cross section of the intersected objects.
- Size of the two objects.
- Angle of intersection.
Fig. (15) – Different intersections used in industry
articles, ducts and smoke stakes as well known as in ships, oil pipe lines,
automotive, air condition ducting, air craft and offshore construction industries .
INTRODUCTION TO AUTOCAD 1
TECHNICAL DRAWING MEC 112 week 1
Fig.(15.1) Examples of components intersection in practice
Developments of intersected objects are closely related to finding intersectionlines. In many instances, if not all intersections have to be determined before
starting to develop a pattern.
This section presents the basis for finding intersection lines of some common
intersected shapes.
15.1: Perpendicular intersection of equally diameters cylindersFig. (15.2)
The intersection between the equally diameters cylinders may be a right
angle (90o) to form a T-connection as shown in fig
The intersection of this cylinders connection can be determined according to
the following steps:
1- Draw the three views for intersected cylinders.
2- Divide the two circle in Side and Top view into (12) equal parts (by using
30,60 triangle or compass ) and number the dividing points 1 to 7 , see
the figure.
3- Project the points from Side View to Front View.
4- Project the points from Top view to Front View until crossing the lines
projected from Side View.
5- Crossing points are created.
6- Joint these created points to obtain the required intersection curve.
Note : the intersection curve in this case is a straight line .
INTRODUCTION TO AUTOCAD 1
TECHNICAL DRAWING MEC 112 week 1
Fig.15.2
INTRODUCTION TO AUTOCAD 1
TECHNICAL DRAWING MEC 112 week 1
15.2: perpendicular intersection of unequal diameters cylinders:
Cylinders of unequal diameters may be intersected at a right angle (90o) to form a
T-joint as shown in next figure Fig. (15.3).
For determining the intersection curve of this cylindrical joint, the same step
followed for drawing the intersection line of equally diameters cylinders can be
used.
A point for remarking is that if the intersecting cylinders are not of the same
diameters, the intersection will not be straight line but rather a curve.
Fig. (15.3)
INTRODUCTION TO AUTOCAD 1
TECHNICAL DRAWING MEC 112 week 1
15.3 TASK (8)
Fig (15.4) illustrates double intersection of three cylinders, find the intersection
line missing.
Fig. (15.4)