Machinery Repairman

Figure 2-13.—Using a scribe.
straightedge, template, or pattern at its point of
contact with the surface of the metal.
To scribe a line on stock with a combination
square, place the squaring head on the edge of the
stock, as shown in figure 2-14. Draw the line along
either edge of the blade. The line will be square with
the edge of the stock against which the squaring head
is held; that is, the angle between the line and the edge
will be 90°.
To draw lines parallel to an edge using a
combination square, extend the blade from the
squaring head the required distance, such as the
2-inch setting shown in figure 2-15. Secure the blade
at this position. Scribe a line parallel to the edge of
the stock by holding the scratch awl, or scribe, at the
end of the blade as you move the square along the
edge. All lines so scribed, with different blade
settings, will be parallel to the edge of the stock and
parallel to each other.
Figure 2-14.—Using the combination square.
2-9
Figure 2-15.—Laying out parallel lines with a combination
square.
To scribe a line parallel to an edge with a
hermaphrodite caliper, hold the caliper, as shown in
figure 2-16, so the curved leg maintains contact with
the edge while the other leg scribes the line. Hold the
caliper so the line will be scribed at the desired
distance from the edge of the stock.
FORMING ANGULAR LINES
To lay out a 45-degree angle on stock with a
combination square, place the squaring head on the
Figure 2-16.—Laying out a parallel line with a hermaphrodite
caliper.