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Gears are mechanical wheels with teeth that interlock. They are used in machines to transfer motion and power. When gears are connected, the rotation of one gear causes the other gear to rotate allowing them to control speed and force in various devices.
Materials
Materials
Laser cut Gears
Acrylic strip with holes
Nut-Bolt
Step 1: Attach two gears using nut-bolt such that they interlock.
Step 1: Attach two gears using nut-bolt such that they interlock.
Step 2: Mark one of the interlocking tooth on each gear.
Step 2: Mark one of the interlocking tooth on each gear.
Step 3: Keep the marked tooth at starting position.
Step 3: Keep the marked tooth at starting position.
Step 4: Rotate the gears and count the number of rotations.
Step 4: Rotate the gears and count the number of rotations.
Step 5: Stop counting when the marked teeth meet again.
Step 5: Stop counting when the marked teeth meet again.
Explanation:
Gears & Gear ratio
Rotation of gears: Since the teeth of gears interlock, when one gear turns, it makes the other gear turn too. They work together to transfer power and make things move.
Direction of gears: Two gears attached to each other always rotate in opposite directions. This mechanical constrain allows predicting motion of gears possible in a chain of gears.
Gear ratio: Gears have different sizes and numbers of teeth. The gear ratio compares the number of teeth on the gears. It tells us how fast or slow one gear will turn compared to the other gear. It also affects how much power is transferred between the gears.
Calculation of Gear Ratio:
In above example, large gear has 24 teeth & small gear has 16 teeth
Gear ratio can be calculated by counting minimum number of complete rotations till marked teeth meet again.
The marked teeth meet again for the first time after 3 complete rotations of small gear and 2 complete rotations of big gear.
Thus for Gears with 24 & 16 teeth the gear ratio is 2:3.
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