Kinematics and Dynamics - Lab1.pdf

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Kinematics and Dynamics of Mechanisms and Robot

Lab session 1- Drawing Crank-Slider

2011

Tran Thi Luyen [email protected] Page 1

THE LABORATORY SESSION 1 FOR

DYNAMICS OF MECHANISMS AND

ROBOTS COURSE

I. Lab Objective

The SolidWorks software is a mechanical design automation application that takes

advantage of the Microsoft Windows graphical user interface. This software makes it

possible for designers to quickly sketch out ideas, experiment with features and

dimensions, and produce models and detailed drawings.

In this Lab session, we will walk through some basic steps to create a model. We willcreate some individual parts of a full model, after that we gather all parts together byassembly feature. Cosmos Motion will then use the model in next Lab sessions forcreating motion simulation.

This lesson includes: Adding a boss feature

Adding a cut feature

Modifying features (changing dimensions)

Displaying a section view of a part

Bringing parts into an assembly

Using these assembly mates

II. Lab Assessment

The scoring structure mentioned here is for this Lab only; final Lab score will be combined

from all individual Lab scores.

If students are working in group, score will be same for all students in group.
mailto:[email protected]:[email protected]


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In case a student is absent, he (she) will not get the Attendance score. However, he (she) still

can get other scores if he (she) submits (shows) the completion of assignments to the Lab

Instructor by the time specified by the Lab Instructor. No group score is applied for absent

student.

Criteria Score (percent)

Attendance 20

Completion of Lab session 1 80

Total 100

III. Lab Setup

Convention: inches are used as units in this Lab session. To change the unit to inches for a

document, select Tools | Options | Document Properties | Units | IPS (inch, pound, second).

Use Solidworks 2009 software to sketch 3D entity. Open the Solidworks in your computer to

do this Lab session.

In this lab session you will create a Crank Slider as follow:


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Figure 1 Crank-Slider

This Crank Slider consists of 4 parts: Bearing, Rod, Crank and Piston

We will create these 4 parts separately, and then assemble them together.

IV. Draw 4 Parts and assemble them together

1. Crank

Figure 2 - Crank


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Opening a new part document.

1. Click New on the Standard toolbar.

The New SolidWorks Document dialog box appears.

2. Click Part, and then click OK.

A new part window appears.

Sketch the 2 Arcs and 2 Lines with the dimension bellow:

Figure 3 Sketch Arcs and Lines

3. Click Extruded Boss/Base on the Features toolbar.

The Front, Top, and Right planes appear.

Notice that as you move the pointer over a plane, the border of the plane is

highlighted.

4. Select the Front plane.

The display changes so that the Front plane is facing you. The Sketch toolbar

commands appear in the CommandManager, and a sketch opens on the Front plane.

5. Click Arc on the Sketch toolbar.

6. Move the pointer to the sketch origin.


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7. Click the origin, and then move the pointer to create a arc.

8. Click Line on the Sketch toolbar to create 2 lines as Figure 3

Adding Dimensions

1. Click Options on the Standard toolbar.

2. On the System Options tab, click General.

3. Clear Input dimension value, then click OK. This prevents automatic display of the

Modify dialog box that is used for inputting new dimension values.

4. Click Smart Dimension on the Sketch toolbar.

5. Select the arcs and lines, and then click a location for the dimension as specified in

Figure 3

Extruding the Base Feature

1. Click Exit Sketch on the Sketch toolbar.

The Extrude PropertyManager appears in the FeatureManager design tree (left panel), theview of the sketch changes to trimetric, and a preview of the extrusion appears in the

graphics area.


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Figure 4

2. In the PropertyManager, under Direction 1:

Select Blind in End Condition.

Set Depth to 0.3

3. Click OK to create the extrusion.

4. Sketch the circle from one face of Crank as bellow:


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Figure 5

5. Click Features Extruded Boss/ Base, the view of the sketch changes to trimetric,

and a preview of the extrusion appears in the graphics area.

Figure 6

6. In the PropertyManager, under Direction 1:

Select Blind in End Condition.

Set Depth to 0.3

7. Click OK to create the extrusion.


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Repeat from step 4 to sketch another circle as figure 7 and figure 8:

Figure 7

Figure 8

Save the part

1. Click Save on the Standard toolbar.

2. The Save As dialog box appears.

3. Specify the folder you wish to save your files.

4. In the File name box, type crank and click Save.


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The extension .sldprt is added to the filename, and the file is saved.

2. Rod

Figure 9 Rod

Similar as creating the Crank, now we create the Rod with the dimension as bellow:


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Figure 10

Sketch the circle with the dimension 0.5in and click Extruded Boss/Base from the Features

with all setting as Figure 11


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Figure 11

Sketch 2 circles with the dimension 0.5in and 0.53in.

Figure 12

Click Extruded Boss/Base from the Features with all setting as Figure 13


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Figure 13

Sketch the circle at another side of Rod with dimension 0.3in to create a pin and click

Extruded Boss/Base from the Features with all setting as Figure 14

Figure 14


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Now we save the part with the name Rod.

Two parts left are Piston and Bearing, you follow all figures to create 2 parts

3 . Piston

Figure 15 Piston


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Figure 16

Figure 17


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Figure 18

Figure 19


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Figure 20


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Figure 21


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Figure 22

Figure 23

4 . Bea ring


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Figure 24 Bearing

Figure 25


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Figure 26

Figure 27

Assemble 4 parts together

We created already 4 parts of the Crank Slider, Now assemble them together.

1. Click New on the Standard toolbar.

The New SolidWorks Document dialog box appears.


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2. Click Assembly, and then click OK.

A new Assembly window appears.

3. The Insert Component PropertyManager appears.

4. Under Part/Assembly to Insert, select Bearing

5. Click anywhere in the graphics area to place Bearing.

6. In the PropertyManager under Parts/Assemblies to Insert, select Crank

7. Click in the graphics area to place Crank besides Bearing.

8. Click OK.

9. Click Zoom to Fit.

10. Save the assembly as Crank Slider. (The .sldasm extension is added to the file name.)

If you see a message about saving referenced documents, click Yes.

Mating the Components

In this topic, you define assembly mating relations between the components, making

them align and fit together.

1. Click Mate on the Assembly toolbar.

The Mate PropertyManager appears.

2. In the graphics area, select the face of Crank, then select the inside face of the

Bearing as the Figure 28

3. The Mate pop-up toolbar appears, and the components move into place, previewing

the mate. The edges are listed in the Entities to Mate box under Mate Selections in the

PropertyManager.

4. On the Mate pop-up toolbar, do the following:


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Figure 28

Click Concentric as the mate type.

Click Add/Finish Mate.

5. Click Mate again and select 2 faces as Figure 29.

Figure 29


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Click Coincident as the mate type.

Click Add/Finish Mate.

6. Click OK

Figure 30

Continue the mate coincident 2 orients the Crank to upright position as show in Figure 31

Figure 31

Now we assemble mates for Rod


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Repeat from step 3 to insert Rod into the assembly window, and then assemble mates for

Rod as Figure 32

Figure 32- Assemble mates for Rod

Insert the Piston and assemble mates for Piston as show in Figure 33

Figure 33 Ass emble mates for Piston

Now we have finished Lab Session 1 with Crank Slider as show in Figure 34


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Figure 34 Crank-Slider

Kinematics and Dynamics - Lab1.pdf

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