Isometric%20Drawing%20-%20Trammel%20Method - PowerPoint PPT Presentation

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Isometric%20Drawing%20-%20Trammel%20Method

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Graphic Communication Isometric Drawing - Trammel Method Department of Technological Education – PowerPoint PPT presentation

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Title: Isometric%20Drawing%20-%20Trammel%20Method


1
Isometric Drawing - Trammel Method
Graphic Communication
Department of Technological Education
2
Isometric Circle trammel method
Department of Technological Education
  • Start the isometric circle by drawing the front
    elevation and the plan of the cylinder to be
    drawn.

3
Locating Lowest Corner Drawing Isometric Crate
Department of Technological Education
  • Choose a suitable point X on the elevation and
    plan and a suitable position to start the
    isometric view.

x
  • 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
4
Finding Centre for Isometric Circle
Department of Technological Education
  • Draw centre lines on the isometric view. Use 30o
    and vertical lines for this.

x
5
Finding Points on Circumference of Circle
Department of Technological Education
  • Divide the orthographic circle into sections by
    drawing random vertical lines.
  • There should be enough lines to be able to
    construct an accurate curve in the isometric so
    you should aim for a minimum of 4 points for each
    quarter circle.
  • In the example shown there are 4 points for each
    part so this shows the minimum standard required.
  • Number each of the lines.

4
1
2
3
5
6
7
x
6
Transferring Circumference Points to Isometric (1)
Department of Technological Education
  • Each of the random lines need to be transferred
    to the isometric view.
  • This is done by placing a trammel on the centre
    line of the front view and marking where each of
    the random lines passes through the centre line.

4
1
2
3
5
6
7
  • Number each of the points.

1 2 3 4 5
6 7
  • Using the trammel transfer each of the marks to
    the isometric view.

1 2 3 4 5
6 7
x
  • Draw vertical lines through each of the points
    found.

7
Transferring Circumference Points to Isometric (2)
Department of Technological Education
  • Using the trammel, measure the vertical distances
    from the centre line up and down to each of the
    points on the circumference in turn.

4
1
2
3
5
6
7
  • Transfer each of these dimensions onto the
    isometric view.

1 2 3 4 5
6 7
x
8
Drawing Front Isometric Curve
Department of Technological Education
  • Draw a smooth curve through each of the points to
    show the circumference of the isometric circle.

4
1
2
3
5
6
7
1 2 3 4 5
6 7
x
9
Finding Thickness of Cylinder on Isometric
Department of Technological Education
  • Project each of the points on the front curve of
    the isometric back at 30o so that the width of
    the cylinder can be marked.

4
1
2
3
5
6
7
  • Measure the width of the cylinder on the plan
    using a trammel. Because the thickness of the
    cylinder in this case is constant only one size
    needs to be measured, although this may not
    always be the case.
  • Transfer the size measured onto the isometric and
    mark each point found with a small dot.

1 2 3 4 5
6 7
x
10
Finding Tangent Points on Isometric
Department of Technological Education
  • It is necessary to find two final points the
    tangent points.
  • These points are found in the same way as the
    previous points.
  • By drawing diagonal lines on the elevation and
    isometric you will be able to find where the
    corresponding points occur points A and B.

A
4
1
2
3
5
6
7
A
1 2 3 4 5
6 7
  • These points can then be projected back and
    measured as before to find the final positions.

B
B
x
  • Finally, draw a smooth curve through each of the
    points found.

11
Drawing Back Isometric Curve and Tangent Edges
Department of Technological Education
  • To finish the drawing darken the required part of
    the outline of the curve.
  • Complete the two edges to join the two curves
    together.

12
The Final Drawing
Department of Technological Education
  • This is the final Isometric View of the cylinder.

13
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