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3-18. The dado accessory consists of two outside
blades and an assortment of chippers. The paper washers
are for slight adjustments to compensate for variations
in material thicknesses.
and some other special applications, it is often necessary
to make a cut considerably wider than the saw kerf. For this
type of work, a dado accessory is usually used.
3-18) consists of two outside blades, four 1/8" and one
1/16" chippers that are used between the blades. Width of
cut, which can range from 1/8" to 13/16", is controlled by
the number of components that you mount. A single outside
blade will cut a 1/8" kerf; if you mount the two blades, the
cut will increase to 1/4". You must add chippers to go beyond
1/4". For example, for a 1/2" cut, use both outside blades
and two 1/8" chippers. To increase the kerf to 9/16" wide,
add the 1/16" chipper. Since there can be some minute variation
in nominal wood and even plywood thicknesses, paper washers
are supplied for mounting on the arbor between the components;
thus you can make slight adjustments in width of cut.
3-19. The dado accessory mounts on the 5/8"
molder/dado arbor which is then locked to the Mark V's
accessory is mounted on a 5/8" molder/dado arbor which locks
on the Mark V's main spindle (Figure
3-19). Warning: Be sure the tongue washer is used under
the hex nut and the threaded shaft of the arbor is flush or
ex-tends past the end of the hex nut. Never use chippers alone
or mount chippers with only one outside blade, because a kick-back
hazard is created. Arrange chippers so they are evenly
distributed and so their swaged cutting edges align in the
gullets of the outside blades (Figure
3-20. Chippers are always used between outside blades.
Situate the chippers so the swaged cutting edges are
in the gullets of the outside blades.
3-21. Use the special dado table insert with the
dado accessory. The Model 500 insert is shown.
the dado accessory makes extra-wide cuts, you must use a special
table insert that accommodates it (Figure
3-21). Warning: Be sure that the dado accessory has
clearance in the slot. Rotate it by hand, using the auxiliary
spindle, before turning on the power.
of the dado ac-cessory is always less than the thickness of
the stock. You can set projection by using a measuring scale
or a step gauge (Figure
3-22. The projection of the dado accessory can be
set by using a step gauge.
with a dado accessory in much the same way as you do a saw
blade, but since the tool will be removing much more material,
the pass should be made very slowly to give the blades a chance
to work without clogging. Form extra-deep cuts by making more
than one pass. For example, if you need a cut that is 1-1/4"
deep, make one pass with the cutter's projection at about
5/8". Make a second pass after adjusting the saw table for
the full 1-1/4" deep cut. This procedure is especially applicable
if you are working with a hardwood like oak or maple. Warning:
The dado accessory is used without the upper saw guard in
place. Whenever you remove the upper guard, keep the lower
guard in place and make sure the lock knob is secured. Use
a push stick, push blocks and safety devices. Work with extreme
3-23. Because the dado accessory is designed for
wide cuts, the metal lower saw guard must be modified
by using a spacer between the main part of the guard
and its cover. Click on image for larger view.
Spacer (Mark V with Metal Lower Saw Guard Only)- Because
the dado accessory can be used for extra-wide cuts, you must
place a spacer (offered free through Customer Service) between
the two halves of the lower saw guard. If you want to make
a spacer, remove the cover from the guard and trace its contour
on a piece of 1-1/4" stock that measures 3-1/2" wide by 10"
long. Mark the location of the bolt holes and then draw another
line parallel to the first one but about 1/4" smaller. Cut
the stock on a bandsaw or scroll saw, and drill 9/32" holes
for the attachment bolts. When you are finished, the spacer
should look like the one shown in Figure
3-23. Secure the spacer between the two halves of the
lower saw guard with 1/4"-20 x 1-3/4" bolts.