Corrugated fasteners are metal strips bent into
many W shapes. These fasteners are used to butt
two pieces of wood together. One- half the
corrugated fastener goes on the first piece, the other
half goes on the second. They are driven into the
wood like a nail; but unlike a nail, they are not
intended to be removed. The wood is destroyed if
you try to remove a corrugated fastener. The most
common application for corrugated fasteners is for
holding together picture frames. The fastener is
occasionally placed on the back side of the wood,
but normally it is used like a slip feather.
The sequence of steps you should follow to
complete a project is discussed in the following
sections. A brief list of the steps follows. Sand the
pattern to remove tool marks and ridges before it
Figure 3-53.--Dowels and dowel keys.
receives its final protective coating. Add fillets and
include identification markings. Set rapping and
its center as the threads cut their way into the wood.
lifting plates into the pattern.
The thread depth keeps the dowel tight. The male
and female parts fit within 0.001 inch.
You can easily insert or remove the metal dowel
You need to use the correct sandpaper for the
from the pattern by using a dowel key (fig. 3-53).
Table 3-5 lists the dowel number size, the diameter
sanding job on which you are working.
of the dowel pin, and the recommended drill
Sandpaper is graded by the coarseness or
fineness of the abrasive particles used on the paper.
The grade is marked by a number on the back of
Table 3-5.--Drill Sizes for Metal Dowels
the sandpaper. Table 3-6 shows sandpaper sizes and
their suggested uses. Sandpaper usually comes in
9-inch by 11-inch sheets. For machine sanders, it
comes either in rolls or cut to fit the machine.
Proper storage of sandpaper is important.
Never store it in an area that is too damp or too
dry. Moisture loosens the abrasive material, while
excessive dryness makes the paper too brittle.
Hand and lathe sanding are the two methods of
finish sanding that you will routinely use. When you
first started your pattern, you rough sanded pattern
parts on power sanders made to remove large
amounts of wood quickly. Finish sanding requires
the careful removal of small amounts of wood in