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TRAMMELS FOR ENGINEERING
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Trammels are available in a range of sizes and allow for the scribing of large arcs, beyond the capacity of spring dividers. They are also ideal of transferring measurements. The knurled grips can be loosened and tightened, allowing them to slide along the round section bar. This means that a distance can be set quickly and the fine adjuster used for a more accurate measurement.
 
 
 
 
Using a trammel to scribe an arc on the surface of sheet metal, is shown below. A centre punch ‘indentation’, is at the centre of the arc, ensuring that the trammel does not slip on the surface, during scribing.
 
 
 
 
This diagram shows a trammel being used, to determine the distance between two points of an engine component. Once the distance has been set on the trammel, it can be transferred to a ruler, so that the mm measurement can be read accurately.
 
 
 
 
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