lab 6: auxiliary views, cross-sections, and...

IAT106 IAT106 Fall 2019

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IAT106: Spatial Thinking and Communicating

Lab 6: Auxiliary Views, Cross-Sections, and Assemblies In this lab you will complete exercises on auxiliary views, cross-sections, and creating assemblies in SolidWorks. The lab is divided into three parts, one for each of the subjects. For part one and two, your TA will complete an example exercise, and then you will complete some exercises on your own. For the SolidWorks component, the TA will help guide you through the exercises. All exercises are due at the start of next week’s lab. This lab is worth 100 points.

Part I: Auxiliary Views (Chapter 6) Many times, in a multi-view drawing, a face will not be parallel to any of the primary planes, which results in no view that is true shape and size. Often, you will want a view that is of true shape and size, so you will need to construct an auxiliary view. Follow along with the TA using the image below. You do not need to hand this exercise in. TA Demo: Fig 6.17 exercise #1 (pg 355)

For each exercise listed below, sketch the given views and create a partial auxiliary view for the inclined surface. You should use graph paper for these exercises. Label the points of interest, label the fold lines, and keep your construction lines. Each drawing should occupy half a page.

In-class: Fig 6.17 exercise #5 (pg 355) Homework: Fig 6.18 exercise #4 and #10 (pg 356)

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Part II: Cross-sections (Chapter 8) As you saw in the lecture, often the interesting parts of an object are hidden by the object’s own surfaces. In this type of situation, a cross-sectional view of the object is needed in order to communicate design intent. Follow along with the TA using the image below. You do not have to hand in this exercise. TA Demo: Fig 8.57 exercise #12 (pg 462)

For each exercise listed below, sketch the given views and create a cross-section for the given cutting plane. You should use graph paper for these exercises. Each drawing should occupy half a page.

In-class: Fig 8.57 exercise #5 (pg 462) Homework: Fig 8.57 exercise #8 and 15 (pg 462 and 463)


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Part III: Assemblies in SolidWorks In last week’s lab, you created two parts in SolidWorks. This week you’ll learn how to create assemblies that incorporate many parts together to create a functioning object. Exercise: Here, you create a somewhat more complex assembly using pre-made parts. Go to the IAT 106 website and download the compressed folder containing the parts files, AssemblyDemo.zip (or AssemblyDemo.rar) to your desktop. Unzip the folder. Using the instructions provided in Appendix A below, use those parts to make a “stamper” device. The stamper is shown in the figure below fully assembled along with an exploded view showing each individual component.

Submission Instructions All in-class and homework exercises are due at the beginning of your next lab. Place your name, student number, and lab section at the top-right of each page. DON’T FORGET to STAPLE multiple pages! For the SolidWorks assemblies, create a zip file named <lab section>_<your name>_<student number>.zip and submit to using Canvas.

Assigned Readings from the Textbook Auxiliary Views: Ch 6: 6.1 to 6.2.7 and 6.3.4 Cross-sections: Ch 8: 8.1-8.2 and 8.4.1 - 8.4.6

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Item Due Individual or Team

Criteria Activity Mark

Part Mark

Total

Auxiliary views before next lab

individual

30

view alignment 3

fold and construction lines

6

named vertices in all views

6

proper shape 15

Cross sections before next lab

individual

30

view alignment 3

position and section cut lines

3

hash marks 3

centre lines 6

no hidden lines 3

proper shape 12

SolidWorks stamper assembly

before next lab

individual

40

subtract 5 for every incorrect mate Animation

30 10

TOTAL

100


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Appendix A: Stamper Assembly Instructions Step 1) Open a new assembly in SolidWorks by going to File/New…

Step 2) Select New Assembly Save your assembly as Stamper_<YourName_StudentNumber>

Step 3) The insert component window should automatically come up. If not, go to Insert/Component/Existing Part/Assembly. Click the Browse button and navigate to the folder you downloaded.

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Step 4) Select the component called base.SLDPRT and left click on the screen to place the object into the assembly.

Step 5) You are now going to add a support arm to the assembly as shown in the figure. Go to Insert/Component/Existing Part/Assembly. Click the Browse button and select support_arm.SLDPRT and left click above the base. When adding components, try to place the components in an orientation that is close to its intended position. You can move and orientate individual parts using the following buttons:


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Step 6) To fix the support arm in position, you need to mate the object. Go to Insert/Mate…

Step 7) Select the bottom of face of the of the support_arm and the bottom face of the left trench of the base (see figure). SolidWorks will automatically pick a coincident mate.

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Step 8) Click the green check mark to accept this mate. The part will still move along this face, so you must constrain the degrees of freedom further.

Step 9) With the mate window still open, select the small face of the support_arm (see figure) and the corresponding face in the base’s trench. Click the check mark to accept the mate.

Step 10) The object can still move, so one more constraint is needed. Select the face as shown and the corresponding face of the trench and mate together. Click the check mark to accept the mate. Click the check mark one more time to close the mate window.


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Step 11) Insert another support_arm following the same procedure as above and complete the mates for this part. You will have an assembly as shown.

Step 12) Now, insert the part called crank_support.SLDPRT and add mates so that the object is inserted into one of the two horizontal trenches. The mating is the same as those for the support_arms Insert another crank_support and add the mates. You will have an assembly that looks like the one in the figure. These parts should be fully constrained (i.e., should not move).

Step 13) Insert bar.SLDPRT into the assembly. Click on the curved surface of the bar and, while holding the shift key, select the inner surface of the hole of the left support_arm (see figure). Click on

the Mate icon. (This is another way of adding mates). SolidWorks will automatically select the Concentric mate.

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Step 14) Now select one of the flat faces of the bar and the corresponding side of the support_arm (as shown). The bar can still spin within these constraints, but that is okay for our device.

Step 15) Now insert the crank.SLDPRT into the assembly. As shown, select the curved surface of the hole in the far crank_support as well as the far cylinder of the crank. Select the mate button (this will insert a concentric mate).


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Step 16) Select the far face of the crank and the corresponding face of the crank_support. Insert a coincident mate. The crank will now spin. Grab the handle and try it out.

Step 17) Insert the slider.PRT part and using a concentric constraint, mate the two parts together.

Step 18) Insert another slider.PRT and use a concentric mate between it and the bar. Also add a coincident mate with the right support_arm (as shown). This slider actually doesn’t slide

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Step 19) For each hole in the sliders, add a pin.SLDPRT. Use a concentric mate (figure on left) and a coincident face mate (figure on right).

Step 20) Make sure your assembly looks like the figure on the right. You should have 1 base, 2 supports arms, 2 crank supports, 1 bar, 1 crank. 2 sliders, and 4 pins.

Step 21) Insert linkage.SLDPRT and mate the small end to the first pin of the closest slider with a concentric mate.

Step 22) Select the closet face of the pin and the closet face of the linkage


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Add a mate to the object. This is a coincident mate, but you want to add an offset of 1mm (make sure the “Flip Dimension” box is not checked). This centers the linkage on the pin. You could also make the same constraint by mating the same face of the linkage to the inner face of the slider.

Step 23) Mate the other end of the linkage to the crank using a concentric mate. Turning the crank will now move the slider.

Step 24) Insert the part scissor_linkage.SLDPRT into the assembly. Use a concentric mate and an offset coincident mate in order to mate one end of the scissor_linkage to the second pin of the first slider.

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Step 25) Insert another scissor_linkage into the assembly and mate it in a similar way to the first pin of the second slider. Make sure to orient it in the proper way. See figure.

Note how the ends of the scissor-linkages are facing different directions.

Step 26) Insert pin2.SLDPRT. Concentric mate this piece to both scissor_linkages. Select the front face of pin2 and the closest face of the second scissor_linkage and coincident mate together.

Step 27) Insert stamp.SLDPRT and two pin.SLDRT. Mate one pin to the hole of the stamp and the other to the cut out. Then mate the two pins to the scissor_linkages. When you turn the crank, the slider will move along the bar causing the stamp to move up and down.

Step 28) To animate your assembly, go to the bottom of the SolidWorks window and select the “Motion Study” Tab (next to the “Model” tab). A new window bar will appear as shown below.


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Step 29) Select the rotary motor button:

Now, click on the crank as shown in the figure. Then click the green check mark. Step 30) Click on the calculation button:

Let the calculation run for a few seconds, and then press the stop button (the black square). You can play the simulation by pressing the play button (the green arrow).

lab 6: auxiliary views, cross-sections, and...

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