6.2.4 Hermaphrodite Caliper
The hermaphrodite caliper, Figure 6-8, is
used to make lines and locate points. The tool has
one leg shaped like that of an inside caliper, and
another leg pointed like a divider leg. A
hermaphrodite caliper can be used to lay out
straight or curved lines that are parallel to the
edge of the material. See Figure 6-9. It can also be
used to locate the center of a piece of irregularly
shaped stock.
6.2.5 Surface Gage
A surface gage is designed for many
purposes, but it is most frequently used for
layout work. It consists of a base, spindle, and
scriber. See Figure 6-10. An adjusting screw is
used for making fine adjustments. The scriber is
mounted to the spindle in such a manner that it
can be pivoted into any position.
A surface gage can be used for scribing lines
at a given height and parallel to the work surface,
Chapter 6 Layout Work 99
Figure 6-5.
Equal spaces can be measured and laid out by
“walking’’ the divider.
Figure 6-6.
To set a divider to a desired size, open the legs and
align them on a steel rule as shown.
Adjusting screw
Scriber points
Sliding heads
Beam
Figure 6-7.
A trammel is used to draw large circles and arcs.
Figure 6-8.
Hermaphrodite calipers have one leg similar to that
of an inside caliper; the other leg has a replaceable
point for scribing. (L. S. Starrett Co.)