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Measuring Tools

2-9. Measuring Tools

The most used and important tools that you must learn to use are those for measuring and layout work. Carpenter's measuring tools include rulers and tapes. Layout tools include various types of squares, dividers, and compasses and a marking gauge. The square is used for drawing angles. Dividers and compasses are used to scribe circles or transfer measurements. The carpenter's scribe is in the same class as a compass; it is used to scribe lines on building material for irregular joints. The marking gauge is used to mark lines parallel to a surface, an edge, or the end of a piece of lumber. Measuring and layout must be accurate; therefore, use a very sharp pencil or a knife blade.

When measuring, lay out your ruler or tape from your starting point and measure the distance called for by your plan. Place a mark opposite the required distance and square or angle the line as required by your layout.

a. Folding Rule. A folding rule is made from boxwood and has a concealed joint or rivet that holds it stiff and rigid when opened. Usually 6 feet in length, it is marked off in feet and inches and graduated in sixteenths of an inch. Figure 2-43 shows the folding rule most often used by carpenters.

Figure 2-43. Folding rule

b. Steel Tape. In recent years, the flexible steel tape has been replacing the folding rule. It is also marked off in feet and inches and graduated in sixteenths of an inch. The flexible steel tape is housed in a metal casing with a spring attachment, which retracts the tape into the casing when the end is released. This type of rule is best because of its compactness and suitability for taking inside measurements (Figure 2-44).

Figure 2-44. Steel tape

Curriculum design: David L. Heiserman
Publisher: SweetHaven Publishing Services