Squareness: Difference between revisions
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[https://en.wikipedia.org/wiki/Carpentry '''Carpenters'''] and [https://en.wikipedia.org/wiki/Engineer '''Engineers'''] use '''[[Try | [https://en.wikipedia.org/wiki/Carpentry '''Carpenters'''] and [https://en.wikipedia.org/wiki/Engineer '''Engineers'''] use a '''[[Try Square]]''' to draw or scribe lines at right angles to an edge or to test if a corner is '''Square'''. They may also use a '''[[Squares|Framing Square]]''' to check that corners of a larger construction are '''Square''' - but this can also be done by testing that its [https://en.wikipedia.org/wiki/Diagonal '''Diagonals'''] are of equal length ''(since this is a characteristic of all squares and rectangles). | ||
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<span style="color: green">'''Note:''' | <span style="color: green">'''Note:''' | ||
Latest revision as of 14:02, 22 July 2015
Squareness refers to things being a right angles or 90 degrees to each other (i.e. as the corners of a Square). Checking that something is Square is a common designing and making requirement and operations often have to be performed at right angles to an edge or surface (e.g. marking a line, cutting material to length, drilling a hole).
Carpenters and Engineers use a Try Square to draw or scribe lines at right angles to an edge or to test if a corner is Square. They may also use a Framing Square to check that corners of a larger construction are Square - but this can also be done by testing that its Diagonals are of equal length (since this is a characteristic of all squares and rectangles).
Note: The Diagonals of an Isosceles Trapezium are also equal so checking their length would also test if such a regular shape was ‘squared up’
In Technical Drawing a Draughtsman would use a T-square pressed against the edge of a drawing board to draw parallel lines across the paper and place Set Squares to draw lines at 90deg, 45deg, 60deg, and 30deg to it.