﻿ General Design Information > Basic Kinematics > Kinematic-Chains in MECHDESIGNER > Pulley-Rocker

# Pulley-Rocker

### Belt, Path-Joint, Pulley-Rocker

 Add Pulley makes a motion relationships between a Rocker, a Motion-Point on a sketch-loop and the radius of a Pulley. There are two Pulley types: •Drive-Pulley - its motion is given by a kinematically-defined Part.•Driven-Pulley - its motion is given by the speed of the Belt.The linear speed of the Motion-Point along a sketch-loop is equal to the product of the angular velocity of the Pulley and the Pitch-center-Radius of the Pulley. VelocityMOTION-POINT = RadiusPULLEY * ωPULLEY   You can add one Drive Pulley and one or more Driven Pulley to each sketch-loop. For the Drive-Pulley Specify a Drive Pulley at an Arc in a sketch-loop with a Rocker joined to its center. VMP = Velocity of the Motion-Point  - calculated by MechDesigner RP = Radius of the Drive Pulley - specified by the Pulley dia Example Kinematic-Chains log-box ωP = Angular Velocity of a Rocker - specified by Kinematic FBs For each Driven-Pulley Specify a Driven Pulley at an Arc with a Free-Rotating-Part joined at its center. VMP = Velocity of the Motion-Point  - specified by the Drive-Pulley RP = Radius of the Driven Pulley - specified by the Pulley dialog-box ωP = Angular Velocity of the Free-Rotating-Part becomes a Pulley-Rocker - calculated by MechDesigner The Pulley-Rocker is a kinematically-defined Part.