Gears are incredible mechanical components. Gears have existed for thousands of years; the earliest gears were had wooden teeth with pin or wedge shapes. However the shape of modern gears has evolved to reduce friction, noise, and wear. Most spur gear tooth shapes are based upon involute profiles, which minimize frictional losses. Some resources include:
A key parameter is the pitch circle, which indicates where the teeth should mesh, and is used in calculating the Center Distance. The Pressure Angle indicates the angle at which the contact force between gear teeth occur. Although for rough force estimates a zero pressure angle is sometimes used. To make your own gears on the Lasercamm, you can use the files below which were generated from the Autodesk Inventor Design Accelerator (using a pressure angle of 20 degrees). The larger the pitch number, the smaller the gear tooth. Each "Pitch Set" below contains a number of different diameter. gears to choose from. Advantages of Large Teeth Size (small pitch number)
Advantages of Small Teeth Size (large pitch number)
A Few Design Considerations with Gears:
Making Your Own Gear Shapes
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