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How to use a trammel head
as a marking gauge

Shop for Trammel Heads

With an engineers square or try square, one trammel head can be used as a substitute for a marking gauge. Marking gauges are used to draw a line parallel to the edge of a surface. With an engineers square or try square, one trammel head can be used as a substitute for a marking gauge. Marking gauges are used to draw a line parallel to the edge of a surface.
Step 1 - Install pencil in your trammel head Install a pencil or other scribing device in the body of the trammel head.

Step 1 – Install pencil in trammel head

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

Step 2 - Clamp trammel head onto engineers square or try square Clamp the trammel head onto the blade of the square a set distance from the edge of its stock.

Step 2 – Clamp trammel head onto engineer’s square or try square

Clamp the trammel head onto the blade of the square a set distance from the edge of its stock.

Step 3 - Run square along the edge of the surface Position the square on the edge of the workpiece. Run it along the edge of the surface you will be marking, so that the pencil installed in the trammel head marks a line down the length of the part.

Step 3 – Run square along edge

Position the square on the edge of the workpiece.

Run it along the edge of the surface you will be marking, so that the pencil installed in the trammel head marks a line down the length of the part.

The line you have drawn will be parallel to the edge of the workpiece. The line you have drawn will be parallel to the edge of the workpiece.