19
PREPARING SCREW HOLES
It is important to prepare screw holes
before attempting to fasten two pieces of
wood together. Proper preparation will
make screws drive easier and prevent
misaligned components, stripped screw
heads, splitting and separating of wood
components.
1. Clamp the components that are to be
screwed together in their desired
position (Fig. 9).
2. Drill a pilot hole (1) through the outer
piece (2) and into the inner piece (3).
Drill the hole 2/3 the diameter of the
smooth portion of the screw shank.
NOTE:
If the wood is soft, drill the hole 2/3
the length of the screw. If the wood is hard,
drill the hole the full length of the screw.
3. Remove the clamp from the two
pieces to be screwed together.
4. Enlarge the hole (1) in the outer piece
(2) so it is the same size as the
smooth portion of the screw shank
(Fig. 10).
5. If using a flat head screw, counter-sink
the hole (4) so the head of the screw
will be flush with the surface when
fully driven into place.
ASSEMBLY AND OPERATION
ASSEMBLY AND OPERATION
Fig. 9
Fig. 10
