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  • Boston Gear
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Change Gears

Change gears are flat, hubless spur gears with straight teeth that mesh on parallel axes to transmit rotary motion. Change gears are effective in machine applications with frequently changing gear ratios, and can be used together to transfer energy from one part of… Learn More

Gears are available in a variety of materials, including stainless steel, cast iron, brass, and plastic, depending on application. There are several other factors to consider when selecting the appropriate gear for an application. The gear’s outside diameter is the longest linear distance across a gear. The bore diameter is the distance across the hole located in the center of a gear, where the mounting shaft will be inserted. The hub diameter is the distance from one tip of the shoulder (the hub) to the other. The thickness is the distance measured from the tip of a gear tooth to the gear’s bore or base (for a gear rack). The number of the teeth refers to the number of teeth around a gear. The pitch, also called the diametral pitch, is the number of teeth divided by the pitch diameter, and it can also serve as a guide for tooth size.

Change gears are commonly used in machinery that frequently changes gear ratios, such as lathes, feed drives, and drill presses.

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