d. Pilot and Starter Holes. Prepare the wood for receiving a
screw by baring a pilot hole (the size of the diameter of the screw)
into the piece of wood. A smaller, starter hole is then bored into
the piece of wood that is to act as anchor or hold the threads of the
screw. The starter hole has a diameter less than that of the screw
threads and is drilled to a depth 1/2 or 2/3 the length of the
threads to be anchored. This method (shown in Figure 141) assures
accuracy in placing the screws and reduces the possibility of
splitting the wood.
Figure 1-41.
Sinking a wood screw
e. Covering Material. Both slotted and Phillips flathead screws
are countersunk enough that a covering material can be used (Figure
142).
Figure 1-42.
Screw-covering material
1-37
EN5155
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