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22
Preventing Chip Out
As noted previously, when the SIDE and
FRONT/BACK pieces are inserted into the
machine, they are offset a bit so they’ll match
correctly when assembled. In other words, the
SIDE will rest slightly to the right of the
FRONT/BACK in the machine. This leaves the
right edge of the SIDE exposed without the
“chipbreaker” effect that the FRONT/BACK
provides for the rest of the SIDE (see Figure
33). This may result in an unsatisfactory cut at
the edge of the SIDE.
This problem is resolved simply by taking a two-
inch-plus wide “back-up” board, of the same
thickness as the workpiece, and clamping it
horizontally next to the FRONT/BACK piece, so
that it backs up the exposed edge of the SIDE,
as shown in Figure 33. You can use this piece
over and over again.
Dovetails in Plywood
Because plywood handles a bit differently than
solid stock, here are some tips to follow:
1. When using plywood, the layers tend to be
more fragile. Therefore, the operator should
keep the movement of the cutting unit
consistent and proceed relatively slowly.
2. On the rounded arcs of the tenon cuts, you
may lose a bit of the top layer. This is to be
expected with plywood, and does not affect
either the look or the strength of the
assembled dovetail joint. Rather, the
strength of the dovetailed corner comes
from the flat side of the tenons.
3. Plywood has a tendency to chip out on
exposed edges. A back-up board may be
necessary (see Figure 33).
Figure 33
(view from rear of machine)