Three Shafts, Two Belts, Four-Pulley, with two pulleys on One Shaft

PREPARATION IN THE Part-Editor

STEP 1:

Add a Line

The start-Point of the Line MUST be merged with the centre-Point of the Arc.
[It is easier to Add the Arc, then Drag the Line from the centre 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 Edit Pulley dialog-box

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 centre-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 Add Pulley in the Kinematic-elements toolbar

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.	The Pin-Joint

2.	The 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 centre 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.

Notes:

PREPARATION IN Part-Editor

You must merge the centre-Point of the Arc for the second belt, with the centre-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 dimension each Arc

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

See Pulley dialog-box

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

Step 5 is complete

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

Make the selections for the Command-Manager:

a.	Select the Pin-Joint at the centre 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.