You have now determined the final design of the base support for the motor part. In this section of the project, you create a support foundation on the cylindrical base feature.
Figure 41: Changes to the Motor Part
1. Open the motor part (gamma_motor.prt).
2. Suppress all features, except for the first solid protrusion and the default datum planes.
3. Add a feature for the motor foundation, as shown in the following figure (Hint: Use a section that will not fill the central hole when it is resumed. An open section will also work).
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Figure 42: Motor Foundation
4. Resume all suppressed features.
5. Create a cut on the side of the electronics foundation, as shown in Detail A of the changes to be made to the motor part. Pattern the cut to include four (4) instances, including the original.
Figure 43: Side Cut
6. Mirror the patterned cut features that are on the side of the electronics foundation to the other side. After you have finished, save the model and erase all.
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SECTION: 3: Completing the Blower Assembly
To finish the assembly, you measure interference and create an assembly relation to prevent the blower part from interfering with the other
components. In addition, you also create a Bill of Materials (BOM) and calculate the mass properties of the components in the assembly.
1. Open blower.asm (gamma_blower.asm).
2. Change the height of the blower parts (gamma_blower.prt) blade from 65 depth to 73.5. Regenerate the assembly.
3. Measure the interference between the members of the blower assembly. Use the Model Analysis… option in the Analysis pull- down menu. Select Global Interference from the Type drop-down list in the dialog box. Choose the defaults shown in the following figure. Toggle the results of the models by clicking on the arrows in the dialog box.
Figure 44: Modal Analysis Dialog Box
Toggle between
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4. Explode the assembly model so that you can see inside the model.
Click Modify, ModExplode to change the position of the blower using a normal plane, as shown in the following figure.
Select this surface to define the normal direction Select these
two surfaces
Figure 45: Exploding the Assembly
5. Determine the distance that can be used for the blower. Measure the distance from the back inside surface of the blower to the front inside surface of the blower using Analysis, Measure, Distance
and selecting the surfaces shown in the previous figure. Remember the distance value.
6. Modify the blade height again on the blower so it will fit within the lower housing of the model. Change the blade length to be the distance you just measured minus the thickness of the top and base of the blower and a clearance. At the current values the distance is equal to 75 – (5 + 2.5 + 5) or 62.5.
7. Develop a relation that drives the blower to always be centered within the lower housing by driving the offset value. Use the parameters shown in the next figure.
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BLOWER PART LOWER_HOUSING PART
Figure 46: Symbolic Dimensions for Assembly Relations
8. Note that the lower housing part does not have any dimensions that control the inside dimension of the interior opening. According to the design intent, you must control the wall thickness. This intent was captured by driving the revolved cut off the dimension of 2.5 (shown as d8:0, d10:0, and d9:0 in the previous figure) from all the edges of the surface of the model.
9. Create a number parameter in the lower housing part. Open the lower housing (or the gamma_lower.prt) part in a sub-window.
Choose Relations and pick the revolved cut and base protrusion to show their symbolic dimensions.
10. Write a relation that is equal to the length of the cut (cut_length = d1 – (d8+ d10)). Remember to use symbolic dimensions. Enter the parameter name in the relation to automatically create a number parameter in the model.
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11. Save lower_housing.prt (or the gamma_lower.prt) and close the window. Activate the assembly window again.
12. Create another parameter in the blower model that represents the overall height of the blower including the base, blade and top.
Open the blower part (or gamma_blower.prt) in another window.
Add the following relation, height = d1+d9+d18, to automatically create the parameter height.
13. Save the blower and close the window.
14. Drive the offset of the blower model within the lower housing so that they are equally offset. Enter a relation similar to d0:1 = (cut_length:0 - height:2)/2.
15. Regenerate the model. Check the message area to see if the system displayed a warning; you may have to regenerate twice, depending on the order in which you added the relations. (Hint: Use Sort Rels.)
16. Click Analysis >Model Analysis to calculate the mass properties of the assembly. Add the density values of your choice to the components. (example 7.63e-9 tonne/mm3 for steel)
17. Use the Info menu to create a BOM. When you have finished, save the model.
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