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
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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: 
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.
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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:  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
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Use Add Pulley
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STEP 1: Add the Pulleys
Mechanism-Editor: |
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Add Pulley opens in the Command-Manager.
Click, in the graphic-area, the four(4) elements from top to bottom - see images above
The Pin-Joint
The Motion-Path FB
The Part-Editor opens to show the sketch-loop to which you added the Motion-Path FB.
The Radius Dimension of the Arc sketch-element with the Green rotating-Part
The Part-Editor closes.
The Part joined with a Pin-Joint at the center of the Arc.
b)Click  to complete the command and to close the Command-Manager. |
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Notes:
This is called a Driving-Pulley.
A Driving-Pulley is driven by the kinematically-driven Part (the Rocker, in this case).
Belt Speed = Radius of Driving-Pulley * Angular-Velocity of the Driving-Pulley
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Do a) and b) again to add a Driven-Pulley.
A Driven-Pulley is added to the free-Part
Its default color is different to that of a Driven-Pulley.
STEP 1: Add the Pulleys
•Edit each Pulley : in the Pulley dialog. |
 Kinematics-Tree - Pulley
Path-Joint |
The Driven-Pulley is in the Kinematics-Tree as a Pulley-Rocker
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The Driving-Pulley is in the Kinematics Tree as a Rocker
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