Modeling and Simulation Tutorial 1. (Slider Mechanism) Objective: To Create Slider Mechanism Elements to Use: SolidWorks Cosmos Motion Dynamics Books Description: This tutorial explains how to set up different kinds of Joints in a Cosmos Motion Mechanism, besides introduces students how to set up concentric and revolute joints in a simple mechanism. This exercise is taken from a Dynamic Books (Meriam) 1
Creation of the mechanism Elements. Attach to this tutorial, there are some drawings to create the CAD models with Solid Works. Creation of SolidWorks Assembly Create a new assembly in SolidWorks, browse for the part called base Select base part, and click on the screen, now browse for the file called link, and do the same procedure 2
Select the front face of the link and the back face of the support, select No in the dialog box that appears, and select coincident in the mate dialog box. 3
Back face of the support Front face of the link 4
Now, select the internal faces of the holes and click concentric. Open the file (part) Called Guide 5
Select the internal face of the hole and the outer surface of the guide pin, and click concentric Click on the back face of the link and the front face of the guide hub, select a distance of 0.5 inches, move the mechanism to get the following graphic. 6
Assembly of the support, link and guide 7
Open the file (part) called guide support, move or rotate it to make the hole concentric with the guide Select the internal face of the hole in the guide support, and the external face of the guide and click concentric 8
Now, open the base part again, select the internal face of the hole in the new base part, and the external face of one of the pin in the hub of the guide support and click concentric, click on the front face of the new base part and the front face of the pin in the guide support part and click coincident. 9
Click on the base of the every support part and click coincident 10
Create a distance constraint between every support (8 inches, no 9) see the figure. 11
Insert the base part, and click on the internal face of the hole and the external one of the pin, click concentric, if it is necessary select the bottom face of the bases part and click coincident. Select the front face of the new base part, the front face of the pin in the guide support part and select coincident 12
Now, insert the pin part and click the internal face of the hole in the link and the external face of the pin and select concentric Select the front face of the pin and front face of the first base and click distance (0.35 inches) 13
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The final assembly has to look like this graphic. Now click on the motion button in the manager window, and the motion manager tree appears. 15
Now, the following parts have to be dragged to the moving parts branch: -Guide_Support -Guide -Link -Pin The following parts have to be dragged to the ground parts: -Base_1 -Base_2 -Base_3 16
The constraints have to look like this graphic. Click on the (+) sign of constraints in the motion manager tree, and click on the (+) of Joints and select the revolute that is on the base_1, right click on it and select properties and select the following parameters. 17
Click apply, Click, motion >options>simulation and select the following parameters Click the simulation button 18
Now, we are going to plot the velocity of the link Right click on velocity and create one 19
Select the link part, automatically the software assume that the point to calculate the velocity is the center of gravity of the link, it can be changed and another point can be selected Hide the velocity vector; velocity, and select velocity graphic, properties (Right click) Click on the simulation button twice, the simulation starts, when it has finished, click on velocity graphic again select plot, X component and Y component. 20
What is the max. X component of the Velocity in the link? What is the max. Y component of the Velocity in the link? Can you calculate the relative velocity between the guide and guide support?, if so what is the value. Note: the software automatically assume some materials properties for every element, it can be changed at any time. Go to materials properties and see what kind of materials are assumed for this mechanism 21