Option 2: Orbiting Pulley center
|
Orbiting Gear center: There is one fixed Pulley, joined to the Base-Part. The belt path is moves with a rotating Part. The Orbiting Pulleys rotate with a rotating Part around the center of one fixed Pulley on a rotating Part. Each Part can be: •Driving Pulley Linear Motion of Belt = Drive Pulley Radius x Drive Pulley Angular Motion •Driven Pulley Angular Motion of Pulley = Linear Motion of Belt / Pulley Radius. |
Preparation
|
STEP 1: Add a rotating-Part - a Crank 1.Edit the Base-Part 2.Part-Editor: Geometry toolbar > Add Line. Drag from left to right-to add the Line. 3.Part-Editor: Constraints toolbar > Add Horizontal | Click the Line. (Add dimensions also to fully constrain the Line ) 4.Exit the Part-Editor |
|
5.Mechanism-Editor: Kinematic-element toolbar > Add Part (INSERT key as shortcut) 6.Mechanism-Editor: Drag to add the Part |
|
7.Mechanism-Editor: Kinematic-elements-toolbar > Add Pin-Joint | Click the start-Point of the new Part and the start-Point of the Line in the Base-Part 8.Mechanism-Editor: Kinematic-FBs toolbar > Add Motion-Dimension FB | Click the Pin-Joint, the horizontal Line, and the CAD-Line in the Part. 9.Click |
|
STEP 2: Add a sketch-loop to define the belt-path. 1.Edit the rotating Part Add the belt-path as a sketch-loop. Use the Hover + Drag technique (faster) or use Merge-Points in the Part-Editor 2.Part-Editor: Geometry toolbar > Add Line x 2 | Drag to add the Lines approximately parallel to the X-axis of the Part - see sketch to the left 3.Part-Editor: Geometry-Editor > Add Arcs x 2 | Hover + Drag from the end-Point of a Line to the start-Point of a Line, then Drag again to approximate the radius of the arc. 4.Part-Editor: Constraints toolbar > Add Coincident | Click the center-Point of an Arc then the start-Point of the CAD-Line at the Origin of the Part. 5.Part-Editor: Constraints toolbar > Add Coincident | Click the center-Point of an Arc then the X-axis of the Part. |
|
1.Part-Editor: Geometry toolbar > Add Dimension | Click each Arc to define the radius of each Arc. 2.Exit the Part-Editor STEP 3: Add a Motion FB to the sketch-loop 1.Mechanism-Editor: Kinematic-FBs toolbar > Add Motion-Path FB 2.Mechanism-Editor: Click the sketch-loop - the belt path. 3.Click |
|
STEP 4: Add a Linear-Motion FB 1.Mechanism-Editor: Kinematic-FBs toolbar > Add Linear-Motion FB | Click the graphic-area STEP 5: Add a Part We must add a Part to the other end of the sketch-loop. We will add a Pulley with this Part - see below. |
Add Pulley × 2
|
STEP 1: Click Kinematic-element toolbar > Add Pulley |
|
Add Pulley opens in the Command-Manager. 1.Click the Pin-Joint at the origin of the rotating-Part. 2.Click the Motion-Path FB The Part-Editor opens. It shows the sketch-loop the will become the Belt 3.Click the Dimension of the Arc sketch-element at the origin of the CAD-Line The Part-Editor closes 4.Click the Base-Part.
|
|
MechDesigner adds the Pulley. It is Cyan color. It is a Driving Pulley.
You must do Add Pulley 2 x to add a Pulley to each Arc. |
|
STEP 2: Click Kinematic-element toolbar > Add Pulley AGAIN 1.Click the Pin-Joint at the origin of the Part at the end of the belt-path. 2.Click the Motion-Path FB - we click the same Motion-Path FB as it is the same belt-path. The Part-Editor opens. It shows the sketch-loop the will become the Belt 1.Click the Dimension of the Arc sketch-element at the end of the belt-path The Part-Editor closes: 2.Click the Part at the other end of the belt-path The Pulley has a Magenta color. This means it is a Driven Pulley. |
