A simple wooden pendulum is a swinging arm with a pivot at the top and a weighted bob near the bottom. If you’re building one for a clock project or a decorative science demo, the key is smooth movement (low friction) and a stable weight that won’t wobble.
You’ll need a straight hardwood strip (maple, oak, or birch), a small block or dowel for the bob (or a drilled wooden disc), wood glue, sandpaper (120–220 grit), a drill with small bits, a screw eye or small nail for the pivot, and a sturdy frame or bracket to hang it from. Optional: thin washers to fine-tune weight and a clear finish (wax, shellac, or polyurethane).
1) Shape the pendulum rod: Cut a strip about 8–14 inches long (longer swings slower). Keep it straight and uniform. Round the edges slightly and sand smooth to reduce air drag and snagging.
2) Create a clean pivot: Drill a small hole centered near the top end of the rod. Install a screw eye in the support frame (not the rod) and hang the rod on a small nail, pin, or smooth wire through the rod’s hole. The goal is a hard, smooth contact point that swings freely without grinding.
3) Make and mount the bob: Cut a small wooden block or disc and drill a centered hole to fit the rod. Slide it onto the rod near the bottom and glue it in place. A heavier, compact bob swings more steadily than a large, light one.
4) Add adjustability (recommended): For clock-like tuning, mount the bob so it can slide up and down before tightening—use a snug friction fit, a tiny set screw in the bob, or a clamp-style piece. Moving the bob down slows the swing; moving it up speeds it up.
5) Finish and test: Apply a light finish and let it cure fully. Hang the pendulum, give it a small push, and watch for side-to-side wobble. If it twists, re-center the bob or true the pivot hole.
For ideas on how wood pendulums look and behave in real clocks—and how they complement vintage décor—see the guide at Vintage Wood Pendulum Table Clock Buying & Styling Tips.
Slide the bob down to make the period longer (slower swing) and slide it up to make it shorter (faster swing). Small adjustments make a noticeable difference, so move it in small increments and retest.
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