68 - Our All-New Router Jig, страница 15

68 - Our All-New Router Jig, страница 15

FEATURE PROJECT

t i

^ LOWER

(C) ADJUSTMENT BLOCK ; (2%" x 6V2")

THREADED INSERT

x 11/z" Rh WOODSCREW AND WASHER

INSERT

LOWER SIDE

NOTE: CLAMP ADJUSTMENT BLOCK AND SPACER BETWEEN SIDES AND SCREW TO BASE

TEMPORARY

SPACER (2%" x 6V2")

#8> x V/2" Fh ^ WOODSCREW j

1/2"-DIA.

1V2"--r- DIA. A HOLE

TOP VI

%" I.D. SPACER

UPPER ADJUSTMENT BLOCK

6V2")

x V/2" Fh WOODSCREW

NOTE: ASSEMBLY IS SHOWN UPSIDE-DOWN

NYLON SPACER

A Spring. The

two halves of the tapered bed are held together with springs.

With the jig turned upside-down, and working through the opening in the base, use a pair of needle-nose pliers to grasp the end of the spring and slip it over the screw hook.

m

to the adjustment block, you also need to make a bed top (D). This piece has a long slot that will receive the sliding table later. After cutting the slot, you can screw the top to the upper sides of the tapered bed and add the upper adjustment block.

Assembly - With both halves of the tapered bed complete, you can assemble the two sections. The upper section is held down to the lower sections with four strong springs. The springs hold the sections together while still allowing them to slide.

To assemble the two sections, I started by installing screw hooks for the springs in the base and in the underside of the bed top (Figures 1 and 6). The springs have a loop on each end that will be slipped over the screw hooks later, see margin photo.

After the screw hooks are installed, you can add the threaded rod, washers, lock nuts, and knob. This hardware is installed on the adjustment block on the upper section of the bed, as you see in Figure 6a. Once it is in place, you can thread the rod into the threaded insert in the lower adjustment block and then set the upper bed section on the lower bed section. Finally, using a pair of needle-nose pliers, hook the ends of the springs over the screw hooks, see drawing in margin.

CROSS SECTION

The adjustment block on the lower section of the bed has a threaded insert installed in the center, as you can see in Figure 4a. Once this is done, you can add the two lower sides and the adjustment block to the base of the mortising machine. To do this, I clamped the ^fc sides and adjustment block together as a unit. (I also clamped a spacer

block in between the two sides.) Then I screwed the tapered sides to the base. Finally, you can screw the adjustment block in place between the two sides (Figure 4).

The upper half of the tapered bed is a little different. Instead of a threaded insert, a nylon spacer is installed in the adjustment block (Figures 5b and 5c). And in addition

SECOND:

THREAD ROD INTO LOWER BED SECTION

'/2" x 2% EXTENSION SPRING

ADJUSTMENT BLOCK

ADJUSTMENT BLOCK

FIRST: ADD THREADED ROD, KNOB, LOCK NUTS, AND WASHERS TO UPPER BED SECTION

THIRD:

ATTACH SPRINGS (SEE MARGIN)

#12 SCREW HOOK

No. 68

ShopNotes

15

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