Shopsmith 555970 - Manual (Page 21)

MARK V – MOUNTED OVERARM PIN ROUTER 555970
21
ample fixture shown in Figure 10 will
produce two different sized oval picture
frames, one oval plaque and a rectan-
gular picture frame with an oval
opening . . . all from a single workpiece.
CAUTION
Be sure to use screws to hold every piece
of stock that will be separated when you
make your through-cuts. If you fail to do
this, once these cuts are made, scrap
stock could be caught by your rotating
router bit, causing a dangerous kick-back.
This does not apply to the outside scrap
piece that may be removed after you
make your first cut.
NOTE
When using screw-down fixtures for mass-
production, it’s a good idea to use your
original fixture to make several more of the
same design. This way, you won’t be con-
tinually removing and replacing work-
pieces to make different types of cuts with
different profile bits.
2. Clamp-in fixtures . . . are best used when
the outside profile of the product you’re
building is already cut, since any cut-
ting on outside edges will damage the
clamping device (See Fig. 11).
In our example, we’ve used a clamp-in
fixture to cut out a coach lantern that
just happens to have straight, square
outside edges. This fixture features at-
tached sides that form a perimeter
around your workpiece (protruding
above the surface of the fixture, not
quite as high as your workpieces will
be thick) . . . and uses a straight, wooden
clamping bar on the left side that’s
clamped down with thumbscrews
threaded through ordinary drive-in T-
nuts.
As an alternative to this side clamping
method, the clamp could just as easily
work from the top of the fixture, as long
as your clamping device won’t interfere
with your cuts.
3. Profile fixtures . . . are used for shaping
edges only, such as candle sconces or the
tops of picket fences (See Fig 12). This
type of fixture features protruding screw
or nail tips which help hold the
workpiece in position in the fixture and
Figure 10. A typical screw-down fixture
(lower left) — and the projects made with it.
Figure 11. A typical clamp-in fixture and
the project made with it.