About the Belt and Pulley User Interface
The Belt user interface consists of tabs, commands, and shortcut menus. A belt and pulley system is identified by 
in the Mechanism Tree. Click Belts to open the Belt tab.
in the Mechanism Tree. Click Belts to open the Belt tab.Commands
• Unstretched Length—Set an unstretched belt length.
◦ 
User Defined—Sets the user-defined unstretched belt length. Click to type a value in the box and choose the units from the list.
User Defined—Sets the user-defined unstretched belt length. Click to type a value in the box and choose the units from the list.• Settings—Sets the belt stiffness for calculating the forces on the pulleys due to belt tension.
◦ Stiffness (E*A)—Type the Young module of the belt multiplied by the section area. The a value in the box depends on the units you pick from the list.
Tabs
• References—Displays the pulley placement references and the belt plane.
• Options—Displays the pulley rigid body definition and the number of belt wraps.
• Properties—Displays the name of the belt and pulley system. Click 
to open feature information in the browser.
to open feature information in the browser.Shortcut Menus
Right-click a belt and pulley system in the Mechanism Tree or in the graphics window to access additional feature-specific commands:
• Belt Plane—Select a planar surface or a datum plane to route the belt.
• Pulley selections—Select the pulley references to route the belt.
• Clear—Clears the reference collector.