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STEP 2: Center the long axis of the platform on the slide bar and set slide bar to the difference found in Step 1.1Here it's 20 in.)

STEP 2: Center the long axis of the platform on the slide bar and set slide bar to the difference found in Step 1.1Here it's 20 in.)

Lock slide setting with suitcase latch on lockstrip.

STEP 3: Position pencil or bit on centerline of platform half the length of the major axis from cen-terpoint IIn this example, 15 in.)

Attach paper or work piece to \ platform and mark axes.

STEP 3: Position pencil or bit on centerline of platform half the length of the major axis from cen-terpoint IIn this example, 15 in.)

Attach paper or work piece to \ platform and mark axes.

Clamp plywood arm to bench with two clamps.

Clamp plywood arm to bench with two clamps.

locking fluid, available at auto supply stores, will keep the screws from coming loose as the blocks rotate in use.

The final step in preparing the base is to calibrate the slide bar. With the slide bar pushed all the way in, you should have exactly 2 in. between the centers of the fixed and adjustable blocks. If ncccssary, disc sand the nose of the slide bar to reduce the spacing or pull out the slide bar slightly to increase it to 2 in.

Now use a try square to scribe a line across the face of the slide bar at the edge of the base and label it "4." Mark off Vi-in. increments from this mark toward the dovetail block. Since the space between the two dovetail blocks equals half the difference between the length of the major and minor axes of a given ellipse, each '/¿-in. mark on the slide corresponds to a 1-in. difference on the ellipse. (Sec photo, above.)

Next, assemble the platform to the base. With the adjustable slide bar removed, carefully line up one of the side channel openings with the fixed dovetail block. Then slide the platform onto the block, stopping when the platform is centered on the base. Complete the assembly by inserting the slide bar assembly in its groove and pushing the adjustable dovetail

To calibrate jig, make knife marks at '/¿-in. intervals on the adjustable slide bar.

block into the other channel. (See photos, previous page.)

Making the Router Fixture

The simple fixture I made to hold my plunge muter or pencil when using the ellipse jig is shown in Fig. 2. I epoxied two guide bars from a standard router fence into a block, then screwed the block to a plywood arm.

A spacer block about 5 in. high elevates the router fixture above the ellipse jig so the platform can rotate freely under the fixture. (See Fig. 2.) For routing thick stock, you simply add spacers as needed to raise the fixture.

The pencil holder is equally simple to make. (Sec Fig. 2.) First drill a ^-in. hole (big enough for a pencil) through a block the same size as the router fixture, then chisel an '¿-in .-wide tapered slot for a wedge. I chiseled the slot across the grain, although, like life, it would have been easier going with the grain. Make a simple wedge to fit the slot alongside the pencil hole.

Next, drill two holes through the width of the block for the router guide bars. Draw a line through the centers of these holes and resaw the block on the line. If you like, clean up the band-sawn surfaces with a block plane or a disc sander.

Drill pilot holes through the two halves for the »12 by 1'4-in. pan-head screws that clamp the blocks together on the router guide bars. Chase the holes in the upper block with a ^.»-in. drill bit for screw clearance.

Using the Jig

The real advantage to this jig is that you don't have to hassle with templates or inexact drawing methods. You can make a full-size or scale drawing of your project right on the platform of the jig, then proceed directly to the work.

Whether you're routing or drawing, the first step is to clamp the base of the

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Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

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