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2. Steel square - Wikipedia

   en.wikipedia.org/wiki/Steel_square

   The steel square is a tool used in carpentry. Carpenters use various tools to lay out structures that are square (that is, built at accurately measured right angles), many of which are made of steel, but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various angles.

3. Surface plate - Wikipedia

   en.wikipedia.org/wiki/Surface_plate

   A 250 mm x 250 mm surface plate. A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [1] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances ...

4. Machinist square - Wikipedia

   en.wikipedia.org/wiki/Machinist_square

   A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°. Usually a small notch is present at the inside corner of the square. This prevents small particles from accumulating at the juncture and affecting the ...

5. Square (tool) - Wikipedia

   en.wikipedia.org/wiki/Square_(tool)

   Pens, pencils, scribes, drawing boards, and plum bobs. A square is a tool used for marking and referencing a 90° angle, though mitre squares are used for 45° angles. Squares see common use in woodworking, metalworking, construction and technical drawing. [1] Some squares incorporate a scale for measuring distances (a ruler) or for calculating ...

6. Parallel (engineering) - Wikipedia

   en.wikipedia.org/wiki/Parallel_(engineering)

   Parallel (engineering) A parallel is a rectangular block of metal, commonly made from tool steel, stainless steel or cast iron, which has 2, [1] 4 or 6 faces ground or lapped to a precise surface finish. Parallels are used when machining with a mill, drill or any other machining operation that requires work to be held in a vise or with clamps ...

7. Sheet metal - Wikipedia

   en.wikipedia.org/wiki/Sheet_metal

   Microscopic close-up of mild steel sheet metal. Sheet metal is metal formed into thin, flat pieces, usually by an industrial process. Thicknesses can vary significantly; extremely thin sheets are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate, such as plate steel, a class of structural steel. Sheet metal is ...