The Internal Gear will be fixed to the Base-Part. The External Gear will orbit inside of the Internal Gear. The External Gear has 1/3 the number-of-teeth of the Internal Gear

STEP 1: Add a Rotating-Part - see Tutorial 1 for a complete list of instruction.

1.Add a Line to the Base-Part.

2.Add a Part to the Mechanism-Editor

3.Add a Pin-Joint between the Part and the Point at the left of the Line added to the Base-Part

4.Add a Motion-Dimension FB to identify the Part as a Rocker/Crank

5.Add a Linear-Motion FB

6.Connect the Linear-Motion FB to the Motion-Dimension FB

STEP 2: Add Part to the end of the Crank/Rocker

1.Add a Part

2.Add Pin-Joint between the end-Point of the Rocker and the start-Point of the new Part

We are now ready to add a Gear-Pair

STEP 3: Add a Gear-Pair

1.Click Machine element toolbar > Add Gear-Pair

The four elements to add this Gear-Pair are:

The Horizontal Line in the Green Base-Part

The CAD-Line in the Blue Part

The CAD-Line in a Green Part that connects the Base-Part to the Blue Part

The length dimension of the CAD-Line

Note: The Part-Editor will open automatically for you to select the length dimension of the CAD-Line.

To close the Command-Manager you can:

1.Right-click in the graphics-area (a shortcut)

- or -

2.Click in the Command-Manager

The default Gear-Pair has an:

•External mesh

•Equal Number of Teeth (z1 & z2)

•A typical module (m)

Use Edit menu> Application-Settings > Graphic tab > Display colors  > Gear-Pair to change the color of the Gears to give a good contrast with Background color.

Note: for information only. Pitch Diameter (D)  = m*z1  and m*z2 (5*20=100mm) | and Circular Pitch (Pc) = m. π = D.π  ∕  N

STEP 4: Edit the Gear-Pair

1.Double-Click the Gear-Pair in the graphics-area (or see How to open a dialog)

The Gear-Pair dialog opens. Edit the Gear-Pair as follows:

•Define tab > Gear Mesh and Teeth > Gear 1: 60 Teeth | Gear 2: 20 Teeth | Internal Mesh (radio-button)

•Parameters tab > Gear Tooth Parameters > Module = 5

2.Click  to close the Gear-Pair dialog.

3.Cycle the model (ALT+C) to see that the Large Gear is stationary, and the Small Gear rolls around the inside of the Large Gear.

STEP 5: Edit the Part with 20 teeth to add a new Line

We want the length of the new Line to equal the radius of the small Gear. The Pitch Diameter (D)  = m × z1  and 5 × 20 =100mm

1.Part-Editor: Add Line : Drag to add a Line

2.Part-Editor: Geometric Constraint > Coincident Constraint | Click the start-Point of the Line and the start-Point of the CAD-Line

3.Part-Editor: Drag the end-Point on the Line to be in the –X direction

4.Part-Editor: Geometric Constraint> Add Equal | Click the new Line and the original CAD-Line

5.Part-Editor: Add Horizontal : click the new Line

6.Exit the Part-Editor

STEP 6: Add a Trace-Point to the end-Point of the new Line.

1.Mechanism-Editor: Click Kinematic-elements toolbar : Add Trace-Point

2.Mechanism-Editor: Click the end-Point of the new Line

3.Mechanism-Editor: Click in the Command-Manager

The Trace-Point is the path the Point makes in one machine-cycle

If you cycle the machine (ALT+C as the Shortcut) you will see the Point at the end of the Line move along the Trace-Point.