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How to Make a Sectional Link Bar

To demonstrate how a sectional link bar operates, you can build a model from wood. This will show the same type of movement that causes the windshield wipers on a car to oscillate. The sectional link bar will have two pivot points. A pivoting bar is attached to each pivot point by a fourth connecting bar. As one connecting bar moves, it will cause the opposite bar to oscillate.

Things You'll Need

1-inch by 2-inch board
Pencil
Circular saw
Power drill
Pins
Bolts
Nuts

Instructions

- 1
  Measure the 1-by-2-inch board to 3 inches. Make a cut mark with the pencil and then cut a section to this length with a circular saw.
- 2
  Measure and cut a second section to 4 inches. Measure and cut a third section to 5 1/2 inches. Measure and cut a fourth section to 6 inches.
- 3
  Measure down 1/2 an inch on each end of the cut pieces of 1-by-2-inch board. Make a mark using the pencil and then drill a hole with the power drill.
- 4
  Place the 3-inch and 4-inch pieces vertically side-by-side on a table. Place the 5 1/2-inch and the 6-inch pieces parallel so they are perpendicular to the side pieces. You should have the shape of a box.
- 5
  Align the holes at each corner and then insert a pin. If you do not have a pin, you can use a bolt secured by a nut.
- 6
  Hold the 6-inch section of wood to prevent it from moving. Turn the 3-inch section and you will see the 4-inch section begin to oscillate.

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