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How to draw a circle using
trammel heads

Shop for Trammel Heads

Step 1 - Install a pencil in one trammel head and a steel point in the other Insert a small pencil into the body of one of the trammel heads and tighten the clamping nut to secure it in place. The other trammel head should have the steel point installed.

Step 1 – Install marking tools

Insert a small pencil into the body of one of the trammel heads and tighten the clamping nut to secure it in place. The other trammel head should have the steel point installed.

Step 2 - Clamp trammel heads Clamp your trammel heads onto the beam. They should be separated by the same distance as the radius of the circle you will be drawing. E.g. If the diameter of the circle is 30cm, its radius will be 15cm (30÷2=15).

Step 2 – Clamp trammel heads

Clamp your trammel heads onto the beam. They should be separated by the same distance as the radius of the circle you will be drawing. E.g. If the diameter of the circle is 30cm, its radius will be 15cm (30÷2=15).

If you are using a beam with a measuring scale, you will easily be able to move the second trammel head to the correct position. If not, use a ruler or measuring tape to check the distance between the trammels. If you are using a beam with a measuring scale, you will easily be able to move the second trammel head to the correct position. If not, use a ruler or measuring tape to check the distance between the trammels.
Step 3 - Position trammel heads on your workpiece Position the the steel point of the trammel head where you would like the centre of the circle to be. The trammel head with the pencil will be positioned ready to start drawing the circle.

Step 3 – Position trammel heads on workpiece

Position the the steel point of the trammel head where you would like the centre of the circle to be. The trammel head with the pencil will be positioned ready to start drawing the circle.

Step 4 - Pivot the trammel heads Holding the first trammel head, carefully pivot the trammel head with the pencil around in a single motion

Step 4 – Pivot trammel heads

Holding the first trammel head, carefully pivot the trammel head with the pencil around in a single motion

 Step 5 - Draw a circle Continue this motion until you have completed the circle.

Step 5 – Draw circle

Continue this motion until you have completed the circle.

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