﻿ Getting Started Tutorials - MechDesigner > Tutorial 17: Belts and Pulleys > Option 1: Fixed Pulley Centres > Belt Driven by Pulley

# Fixed Pulley centers - Belt Driven by Driving-Pulley

### Fixed Pulley Centers: Belt driven by a Driving-Pulley

This design arrangement is very common : there is one Driving-Pulley.

The Driving-Pulley drives the Belt and all other Pulleys along the Belt. The other Pulleys are termed Driven-Pulleys.

#### Preparation: Sketch-Loop and Pulley Parts

STEP 1: Add a sketch-loop to represent the path of the belt.

 a)Edit the Base-Part : Add a sketch-loop to represent the path of the Belt In this example, the sketch-loop has two Arcs and two Lines. b)Part-Editor: Add a Line and merge its start-Point with center-point of the Arc. c)Part-Editor: You MUST dimension each Arc . d)Part-Editor (Optionally, but a good idea:): Dimension the distance between the Arcs and the length of the line - see b) The radius of each Arc is not important. The Pulley's number-of-teeth and the Belt's tooth-pitch will define the radius of the Pulley and Arc e)Exit the Part-Editor

STEP 2: Add a Motion-Path FB

 a)Mechanism-Editor: Kinematic FB toolbar > Add Motion-Path FB b)Mechanism-Editor: Click the sketch-loop that represents the path of the belt. c)Click in the Command-Manager

The Motion-Point shows at the start-Point of the sketch-element you select in the sketch-loop.

STEP 3: Add the Parts for the Pulley's

 a)Mechanism-Editor: Add one Part for each Pulley. The length of each Part is not important. b)Mechanism-Editor: Add Pin-Joint between the start-Point of each Part and the center-Point of an Arc. c)Mechanism-Editor: Kinematic-FB toolbar > Add Motion-Dimension FB to the Part that will be a Driving-Pulley.

In this case, the Driving-Pulley is a Rocker. A Driving-Pulley can be any kinematically-defined Part