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How to use a trammel head
as a mortise gauge

Shop for Trammel Heads

With an engineers square or try square, trammel heads can be used as a substitute for a mortise gauge. Mortise gauges are used to draw one or more lines parallel to the edge of a part. With an engineers square or try square, trammel heads can be used as a substitute for a mortise gauge. Mortise gauges are used to draw one or more lines parallel to the edge of a part.
Step 1 - Install pencil in your trammel head Install a pencil or other scribing device in the body of each trammel head.

Step 1 – Install pencil in your trammel head

 

Install a pencil or other scribing device in the body of each trammel head.

Step 2 - Attach trammel heads to engineers square or try square Attach the trammel heads onto the blade of the square. The distance between the trammels should be the same distance as you would like between the parallel lines. They should be clamped a set distance away from the edge of the stock of the square.

Step 2 – Attach trammel heads to engineers square or try square

 

Attach the trammel heads onto the blade of the square. The distance between the trammels should be the same distance as you would like between the parallel lines. They should be clamped a set distance away from the edge of the stock of the square.

Step 3 - Run the square along the edge of the workpiece Position the square on the edge of the workpiece. Run the square along the edge of the surface you will be marking so that the scribing tools installed in the trammel heads mark two parallel lines down the length of the part.

Step 3 – Run the square along the edge of the workpiece

Position the square on the edge of the workpiece. Run the square along the edge of the surface you will be marking so that the scribing tools installed in the trammel heads mark two parallel lines down the length of the part.

The lines you have drawn will be parallel to each other and to the edge of the workpiece. The lines you have drawn will be parallel to each other and to the edge of the workpiece.

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