A try square is a woodworking or a metalworking tool used for marking and measuring a piece of wood. The square refers to the tool's primary use of measuring the accuracy of a right angle (90 degrees); to try a surface is to check its straightness or correspondence to an adjoining surface. A piece of wood that is rectangular, flat, and has all edges (faces, sides, and ends) 90 degrees is called four square. A board is often milled four square in preparation for using it in building furniture.
A traditional try square has a broad blade made of steel that is riveted to a wooden handle or "stock". The inside of the wooden stock usually has a brass strip fixed to it to reduce wear. Some blades also have graduations for measurement. Modern try squares may be all-metal, with stocks that are either die-cast or extruded.
"Try square" is so called because it is used to "try" the squareness.
See also
How to Square a Square and Make it True | Hand Tool Woodworking tip - Watch more hand tool fun here http://vid.io/xoYa So how exactly do you square a square? Whether it is a tri-square, framing, carpenter's, or combination square they may or may not actually...
- Combination square
- Machinist square
- Set square
- Steel square
- Speed square
References
