Setting The Cutting Radius

WANT THE DISK?

to the near cutting edge of the bit.

WANT THE HOLE?

WANT THE HOLE?

edge of the bit.

3. Drill the pivot hole in the workpiece. You can't get around needing a pivot hole in the work. It doesn't need to be too deep, since the pivot is little more than a nubbin. Use a l&-inch drill bit. and bore only 1» inch deep. Keep the drill perpendicular to the work.

4. Clamp the workpiece. If you arc routing a through hole, you need to secure the work anil, at the same time, protect the surface beneath it. Moreover, you definitely don't want the pivot point to move as you complete the cut.

What to do? Slide a piece of expendable material— !+inch plywood, for example—under the workpiece.That'll protect the workbench beneath the workpiece. To immobilize the piece that will be cut free, bond it to the backup with carpet tape. With this done, clamp the workpiece and its backup to the workbench, positioning the clamps where they won't interfere with the trammel's travel.

5. Set the router in place, and rout. With everything set up. set the router on the work, and work the pivot into the pivot hole.

With a plunge router, the operation involves no more than switching on the router, plunging the bit into the work, and swinging the machine an>und the pivot.

Fixed-base routers are a bit more problematic, and you may need to experiment a bit with the muter you have to determine the best avenue of attack. You may be able to switch on the motor with the bit retracted within the base, then loosen the lock mechanism, plunge the bit into the work, and tighten the lock. Doesn't work for you? Try setting the cutting depth to about '/« inch, then catching the pivot in its hole while keeping the router base tipped up from the workpiccc so the bit is clear of the work. Switch on the router and lower it onto the work, plunging the bit. Still uncomfortable? Here's a third option: Drill a starting hole the same diameter as the bit. Set the depth of cut; position the router with the pivot in its pilot and the bit in its starting hole. Now switch on the router.

With the cut started, it is a simple matter to swing the router—counterclockwise is the correct feed direction-through a complete circle. Increase the cutting depth, and take another lap. Keep it up, and you'll get there.

A perfect circle is the end result. Whether you want a disk or a hole, the trammel baseplate will serve you. The effective range of the jig is evident: The groove is the largest arc you can produce, while the disk and hole represent the smallest.

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A Course In Wood Turning

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