PREPARATION IN THE Part-Editor

STEP 1: Edit the Base-Part

STEP 2: Add a sketch-loop to represent the Path of the Belt

STEP 1: Add a Line

The start-Point of the Line MUST be merged with the center-Point of the Arc.
(It is easier to Add the Arc, then Drag the Line from the center of the Arc).

STEP 4: Dimension each Arc

The exact radius of the Arc is not important.  Edit the Pulley later to enter the number-of-teeth.

See Pulley dialog-box

STEP 5: Close the Part-Editor

PREPARATION IN Mechanism-Editor

STEP 6: Add a Motion-Path FB

Select the sketch-loop that represents the path of the belt.

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

STEP 7: Add one Part for each Arc

STEP 8: Add a Pin-Joint between a Point in each Part and the center-Point of an Arc.

STEP 9: Add a Motion-Dimension FB to the Part at the Arc you wish to be the Drive Pulley.

There should be one Rocker that identifies the axis that will be the Drive Pulley.

(Not shown in the image: You can add a Linear-Motion FB to the Rocker)

There should be one Rotating-Part for each Pulley you will add.

The length of the Parts are not important.

Click Kinematic-elements toolbar > Add Pulley

Add Pulley opens in the Command-Manager. You must use Add Pulley for each Pulley.

Select these four elements for each Pulley. We add a Pulley to the left Arc first.

Refer to the images above to identify the Elements. Select, from top to bottom.

1.Pulley Center Joint : Pin-Joint

2.Motion-Path FB

The Part-Editor opens with sketch-loop to which you add the Motion-Path FB

3.The Dimension of the Arc sketch-element

The Part-Editor closes

4.The Part joined with a Pin-Joint at the center of the Arc.

MechDesigner adds the Pulley.

Do Add Pulley again, to add a Pulley to the right-hand Arc and Part. This a Driven Pulley.

1.Notes:

•A Drive Pulley is given to the Pulley on the same axis as the Rocker.

•The Linear Speed of the Belt = Radius of Drive Pulley *Angular Speed of Drive Pulley

•The angular speed of the Rocker gives the linear speed to the belt.

•This then gives the angular speed to the other Rotating Parts, and the Driven Pulley

PREPARATION IN Part-Editor

STEP 1: Edit the Base-Part

STEP 2: Add a different sketch-loop to represent the Path of the second Belt

You must merge the center-Point of the Arc for the second belt, with the center-Point of the Arc for the first Belt.

(Add the Arc first, then use Merge-Point tool in the Geometry toolbar).

STEP 3: You MUST add a dimension to each Arc

The radius of the Arc is not important. You can edit the number-of-teeth on Pulley later.

See Pulley dialog-box

STEP 4: Close the Part-Editor

PREPARATION IN Mechanism-Editor

STEP 5: Add a Motion-Path FB

Click a sketch-element in the sketch-loop that represents the path of the second belt

The Motion-Point shows at the start-Point of the sketch-element you click.

STEP 6: Add a Pulley

Make the selections for the Command-Manager:

a.Select the Pin-Joint at the center of the Part Pulley

b.Select the Motion-Path FB

c.Select the Radius dimension of the Arc (the Part-Editor opens to select the Radius of the Arc)

d.Select the Part

Click OK in the Command-Manager.

The Pulley shows in the graphic-area.

Note: You do not need to add a rotating-Part for the second belt, with a different Pin-Joint. We 're-use' these elements.

STEP 7: Add a different Pulley at the other end of the sketch-loop