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Layout Work
combination set
divider
hermaphrodite caliper
layout dye
reference lines
scriber
square
surface gage
surface plate
trammel
LEARNING OBJECTIVES
After studying this chapter, you
will be able to:
• Explain the purpose of a
layout and how it is used to
prepare metal for machining.
• Identify common layout tools
and use them safely.
• Make simple layouts.
• List and observe common
safety precautions used in
layout work.
TECHNICAL TERMS
Figure 6-1. Common tools used to make a simple layout.
Layout is a metalworking term describing the locating and
marking of lines, circles, arcs, and points for drilling holes in
metal. These lines and reference points on the material show
the machinist where to machine.
The tools used for this work are known as layout tools.
Many common hand tools fall into this category, Figure 6-1.
The quality of the job depends on the proper and careful use of
these tools and the accuracy of the layout. This chapter will
cover the common tools and principles used in layout work.
6.1 PREPARING METAL FOR LAYOUT
Because of the shiny finish of metal, it is difficult to
distinguish layout lines on the surface of the material. There
are many types of coatings used to prepare the metal and make
layout lines more visible. Layout dye, Figure 6-2, is probably
the easiest to use. This blue or red-colored fluid, when applied
to metal, provides a clear contrast between the metal and the
layout lines.