Pattern Work & Jigs - Grizzly G9933 Instruction Manual

Pattern Work & Jigs
When using a pattern, the rub collar can be posi-
tioned either above, below or between cutters.
The pattern is usually used when the entire edge
is to be shaped or when many duplicate pieces
are needed. Pattern work is particularly useful
when rough cutting irregular or oversize pieces
and then shaping the edge in a simple two-step
operation. A pattern can be incorporated into a
fixture by way of adding toggle clamps, hand
holds or other safety devices.
You have greater flexibility when choosing the
correct diameter rub collar for pattern work than
for non-pattern work. If you look at Figure 27,
you'll notice that the position of the pattern deter-
mines the depth of cut. In other words, your pat-
tern size is dependent upon the interrelationship
of the cutting circle, the desired amount of mate-
rial removed, and the rub collar size. Changing
one or more of these will change the amount of
material removed. Planning ahead, you can best
decide which rub collars are best suited for your
application.
Pattern
Figure 27. Rub collar determines depth of cut.
When making a pattern, jig, or fixture, here are a
few things to consider:
1. Use a material that will smoothly follow the
rub collar or fence, make the fixture stable,
and fasten the hand-holds to permit effective
operator support and safety.
G9933 Three Spindle Shaper
Rub Collar
2. Secure your workpiece on three sides with
toggle clamps, or fasten the workpiece to the
fixture with wood screws. Make sure they do
not protrude through the workpiece.
3. Ensure that clamps and hidden screws do
not come into contact with the cutter, and
design your fixture so that all cutting occurs
underneath the workpiece.
4. Always consider the cutting circle and rub
collar diameter for the correct cutting depth
when designing your pattern.
5. Make sure the workpiece rests flat on the
table, not on the fixture.
6. When cutting small pieces or cutting against
the grain, it is important to use safety jigs to
keep your hands farther away from the cut-
terhead and protect you from kickback.
Jigs or fixtures must be solid, stable, and
secure; or kickback may occur, causing
personal injury.
Again, if you are unfamiliar with the use of jigs
and the various types available, read a shaper
book and/or get professional training. Also, many
jigs are available to purchase. The jig in Figure
28 shows an example of one type of jig available
through the Grizzly catalog.
Figure 28. The right angle jig.
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