To define, a pulley is a wheel with a grooved rim around which a cord passes through.The pulley acts to change the direction of a force applied and come in many size. Timing pulleys, also known as toothed, notch, cog, and synchronous, are a positive transfer for a belt and can track relative movement. These pulleys can have teeth that fit into a matching toothed belt or similar configurations. When correctly tensioned, they have no slippage, run at constant speed, and are often used to transfer direct motion for indexing or timing purposes

Timing Pulley

Cog Gear


Pulleys are also known as Specialty gears, just another class of objects found in Gearotic CAD. Pulleys may be created and used directly for 3d printing or machining with a 4th or 5th axis CNC milling methods. But since most do not have a CNC 4th or 5th axis mill available, it is still possible to bend the rules a little and make these happen, if you can using glue? Our technique involves gluing the collars to the gear. Basically cut out both the gear and collar separately via 2D, then glue a collar to both side of the gear. It isn’t perfect, however it often works depending on conditions. Various options exist with pulleys, including a pull down library of some of the most popular pulley types out there. Once selected, you can then use the belt calculator inside Gearotic CAD to determine the belt length to fit the pulleys used in your design.

Belt Pulley

List of Pulley Types

Timing Belt Pulley

Gearotic holds in its library many pre-set types of pulleys to quickly match existing timing gears or pulleys . If you do not find a direct replacement of what your looking for, you may need to manually configure and design one to fit. The video link below shows the basic know how on just how to do that, though the screen appearance may appear different since viodeo was made using and older revision of Gearotic CAD, the content, application and information however remains the same and true for all.

Click here to view Pulleys tutorial video on YouTube.

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