The combination of bending and stretching of
Rotary Machine.--The rotary machine, shown in
metal, using male and female dies, forms
figure 4-28, is used on cylindrical and flat sheet metal to
what type of countersink?
shape the edge or to form a bead along the edge.
Various shaped rolls can be installed on the rotary
Why is it necessary to use a hot dimpling
machine to perform these operations.
Q4-1. A soft-faced hammer is known by what name?
Portable power-operated snips are more
commonly referred to by what name?
Q4-2. When rivets are too long for repair, you can
size them to the correct length with what tool?
What sheet metal equipment would you use to
fabricate a wire edge?
Q4-3. What must you use to form a bucktail on a
What brake has removable steel fingers of
Q4-4. Locally manufactured bucking bars are
normally made from what type of steel?
SHEET METAL FABRICATION
Q4-5. To transfer hole locations from the airframe
or skin to a patch, you should use what tool?
LEARNING OBJECTIVE: Recognize the
terms associated with the fabrication of sheet
Q4-6. What is the color of a 1/8-inch Cleco
metal parts. Identify the various procedures
used in the fabrication of sheet metal parts.
Q4-7. What is the difference between snips and
To effectively construct and repair parts of an
airframe, you must be able to lay out, cut, and form
Q4-8. What are the five types of pneumatic riveters?
metal. The layout of bend lines must include the
allowance for the amount of material used to make the
Q4-9. What rivet gun is generally used for heavy
bend in the proper location. The proper fit of the
hitting, and under suitable conditions, is the
finished part can be ensured if the layout, cuts, and
fastest method of riveting?
bends are carefully considered before the actual
What will happen if you apply too much
fabrication is started. The procedures and equipment
pressure to the drill?
discussed in this chapter are designed to provide
Most pneumatic drills are powered by what
accurate and dependable results.
type of motor?
The development of a layout on sheet metal is
A flexible shaft drill is also known by what
basically the same as the development of blueprints and
drawings. For a better understanding of these
procedures, you should refer to Blueprint Reading and
Sketching, NAVEDTRA 14040.
When you are laying out metal, there are certain
precautions that should be observed. In the following
paragraphs, some of the more important precautions are
discussed. For information on the use of layout tools,
you should refer to Use and Care of Hand Tools and
Measuring Tools, NAVEDTRA 14256.
You should take every precaution to avoid marring
aluminum-alloy and steel sheets. To protect the under
surface of the material from any possible damage, you
should place a piece of heavy paper, felt, or plywood
between the material and the working surface. When
you are working with a large sheet of material, it is
important to avoid bending it. It is a good idea to have
someone help you place it on the work surface.
Figure 4-28.--Rotary machine.