Transcript Cut Cylinder

Technical
Department
Graphic Communication
Isometric Drawing with Curves
Technical Department
Isometric Circle – 30o/60o generators method
Start the isometric
circle by drawing the
front elevation and
the plan of the
cylinder to be drawn.
Technical Department
Locating Lowest Corner + Drawing Isometric Crate
Choose a suitable
point ‘X’ on the
elevation and plan
and a suitable position
to start the isometric
view.
Draw an isometric
crate to fit the
isometric view into.
Use 30o and vertical
lines for the angles of
the lines. The overall
size of the crate
should be the exact
size of the isometric
view to be drawn.
x
x
x
Technical Department
Finding Centre for Isometric Circle
Draw centre lines on
the isometric view.
Use 30o and vertical
lines for this.
x
x
x
Technical Department
Finding Points on Circumference of Circle
Divide the
orthographic circle
into 12 equal parts
using 30o and 60o
lines generated out
from the centre.
x
12
11
1
10
Number each of the
points where the
generators cut the
circumference of the
circle – usually done
in the same format as
a clock.
2
9
3
8
4
7
6
5
x
x
Technical Department
Transferring Circumference Points to Isometric (1)
Project points where
generator lines cut
circumference of circle
down and up to
horizontal centre line of
circle.
Measure horizontal sizes
of projected points along
centre line with
compasses and transfer
these sizes onto 30o
isometric centre line.
Project vertical lines
through these points so
that circumference points
can be found.
x
12
11
1
10
2
9
3
8
4
7
6
5
x
x
Department of Technological Education
Transferring Circumference Points to Isometric (2)
Using compasses,
measure the vertical
distances from the
centre line up and
down to each of the
points on the
circumference in turn.
11
x
12
11
1
10
1
9
2
2
8
Transfer each of these 9
dimensions onto the
isometric view.
8
Number each of the
points.
12
10
3
4
7
6
5
3
7
4
6
5
x
x
Technical Department
Drawing Isometric Curve
Draw a smooth curve
through each of the
points to show the
circumference of the
isometric circle.
11
x
12
11
1
10
12
10
1
9
2
2
8
9
3
8
4
7
6
5
3
7
4
6
5
x
x
Technical Department
Determining Thickness of Cylinder
To show the thickness of
the cylinder in the
isometric view it is
necessary to project each
of the points found back at
30o.
Measure the thickness of
the cylinder on the plan
using compasses and
transfer these sizes onto
the isometric. (In this case
all of the sizes are the
same but this may not
always be the case).
It is not necessary to
transfer all of the
dimensions as all of the
points will not be seen at
the end – however if in
doubt it is better to
transfer all and then only
use the required ones.
11
x
12
11
1
10
12
10
1
9
2
2
8
9
3
8
4
7
6
5
3
7
4
6
5
x
x
Technical Department
Drawing Back Curve of Cylinder
It is necessary to find two final
points – the tangent points - to
indicate how far out past points
4 and 5 and points 10 and 11
that the curve passes.
This can be done in two ways –
by finding points A and B on the
elevation and transferring these
points to the isometric in the
same way as points 1 to 12.
– or by drawing diagonal lines
on the isometric to find where
the corresponding points occur
on the front curve in the
isometric.
These points can then be
projected back and measured as
before to find the final positions.
Finally, draw a smooth curve
through each of the points
found.
10
A
x
12
11
10
1
A
11
12
1
9
2
2
8
9
3
8
7
6
5
B
4
3
7
6
4
5B
x
x
Technical Department
Finishing Isometric View
To finish the drawing
darken the required
part of the outline of
the curve.
Complete the two
edges to join the two
curves together.
10
A
x
12
11
10
1
A
11
12
1
9
2
2
8
9
3
8
7
6
5
B
4
3
7
6
4
5B
x
x
Technical Department
The Final Drawing
This is the final
Isometric View of the
cylinder.
x
x
x
Rendered Drawings
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