SolidWorks 2010- P13 ppt

Modeling Parts Within an AssemblyCreate the Shade Subassembly Create an In-Context Model Finish the Shade Model Finish the Shade Subassembly Add Configurations to an Assembly... By m

Modeling Parts Within an Assembly

Create the Shade Subassembly



Create an In-Context Model



Finish the Shade Model



Finish the Shade Subassembly



Add Configurations to an Assembly





ing it into the subassembly, you will be creating the model from within a sembly By modeling the shade from within an assembly, as any components in the assembly are updated, any required changes will automatically be applied to the shade.

subas-Create the Shade Subassembly

Before you can create the shade, you need to begin building the shade bly The base part of the assembly will be the shade mount model you created in the previous chapter The washer subassembly that you created in Chapter 7 will also be used in this assembly If you have not completed the models in the previ-ous chapters, you can always download them from the companion site In addi-tion to the parts and subassemblies from the previous chapters, you also need to download a couple of models in order to complete the shade subassembly

subassem-Once you have downloaded all the necessary models for this chapter, you can begin building a new assembly using the following steps:

1 Click New in the menu bar, and select Assembly in the New SolidWorks

Document window Click OK to create a new assembly model

2 Click Browse in the Begin Assembly PropertyManager.

3 Browse to the folder that contains the shade mount, which is the

Desk Lamp.sldprt file created in Chapter 8, and select the model

Click the Open button

4 Instead of placing the part and using mates to fix its location in the 3D

environment, you’ll accept its default location Since this is the first component being inserted into the assembly, SolidWorks can automati-cally specify the location of the part Clicking the green check mark in the PropertyManager will specify that the part orientation will match the assembly environment

dimensions using three decimal places.

6 Save the assembly as Shade Sub-Assy, Desk Lamp.sldasm

Insert the Washer Subassembly

Now it is time to add the washer subassembly you created in Chapter 7, “Creating

a Simple Assembly Drawing.” By now you have probably become comfortable with

the process for inserting components, so we will not need to spend too much time

detailing the process However, you will need two instances of the washer

subas-sembly, which will give you the opportunity to explore some more options Start by

inserting the first instance, as described here:

1 In the shortcut bar or the Assembly tab of the CommandManager,

select Insert Components

2 In the Part/Assembly To Insert section of the Insert Component

PropertyManager, click the Browse button

3 Navigate to the folder containing the washer subassembly If the

assembly files are not visible, you may need to specify that the file extension be shown In the flyout next to the File Name field, select Assembly (*.asm,*.sldasm), as shown in Figure 9.1

F I g u r e 9 1 Specifying the file type in the Open window

4 Select the washer subassembly, and click Open.

5 The washer subassembly will be shown next to the mouse pointer

Moving the mouse pointer around, you will notice that the washer

freedom that will not be restricted is the rotation around the shaft of the shade mount This means that the washer subassembly will be free to spin around the shaft, which for this design intent is acceptable Apply the required mates as described in the following steps:

1 Select the Mate tool in the shortcut bar or the Assembly tab of the

CommandManager

2 Select the inner diameter of the washer assembly, as in Figure 9.2.

F I g u r e 9 2 Selecting the inner diameter of the washer for mating

3 Select the cylindrical face of the shade retainer shaft, as shown in

Figure 9.3 Click the green check mark in the Mate PropertyManager

to apply the concentric mate

4 Select the top face of the washer subassembly, as shown in Figure 9.4.

5 Select the face of the shade retainer, as shown in Figure 9.5 The position

of washer subassembly will be updated, as shown in Figure 9.6 If the washer subassembly is not aligned in the manner shown in Figure 9.6, click the Anti-Align button in the Mate PropertyManager Click the green check mark in the PropertyManager to apply the mate

F I g u r e 9 3 Selecting the cylindrical face of shaft for mating

F I g u r e 9 4 Top face of washer cover selected for mating

F I g u r e 9 5 Face of shade mount selected for mating

F I g u r e 9 6 Washer subassembly mated to shade mount

Insert the Second Instance of the Washer Subassembly

Now it is time to add the second instance of the washer subassembly Luckily, since the subassembly was inserted once, you can eliminate the step of using the Insert Components command Instead, you will be making a copy of the subassembly without the use of any command There are a couple of ways to create copies of parts and subassemblies in an assembly, but this time you will use our most-used procedure Doing the following will create a copy that you can then mate:

1 Select the washer subassembly in the FeatureManager design tree by

pressing and holding the left mouse button While still holding the left mouse button, press the Ctrl key on your keyboard, and move the mouse pointer into the graphics area A new instance of the washer subassem-bly will be inserted into the assembly To insert the new instance into the assembly, release the left mouse button before releasing the Ctrl key;

otherwise, the new instance will not be created

t I p You can use the Ctrl key to create copies of parts in the graphics area by clicking and dragging a part in the graphics area while holding down the key on your keyboard

2 Mate the second instance of the washer subassembly just as you did

with the first instance When mated properly, the two washer semblies should appear as shown in Figure 9.7 Click the green check mark to exit the Mate PropertyManager

subas-F I g u r e 9 7 Both washer subassemblies mated in place

Create an In-Context Model

In-context models are models that are created in reference to existing geometry

in an assembly Oftentimes, some dimensions of the part relate to other parts in

the assembly, and as the referenced geometry is changed, the in-context model

will update automatically As you can imagine, this could be a huge advantage

because it eliminates the need to manually update all the parts in an assembly

as the design is refined

This is exactly how the shade model will be modeled The steps described here

will enable the overall length of the shade model to automatically update if you

decide to change the distance between the arms of the shade mount If,

how-ever, the length of the shade is manually edited in the model itself, the link to

the assembly will be broken To create an in-context model, do the following:

1 Select the downward-pointing arrow next to the Insert Components

button on the shortcut bar, and select New Part from the flyout

2 Select the face of the washer, as shown in Figure 9.8, to create a new

sketch on the face of the washer After selecting the face, the rest of the components in the assembly will become transparent

O

In-context models eliminate the need

to manually update all the parts in an assembly as the design is refined.

F I g u r e 9 8 Selecting the face to insert a sketch for the shade model

The new part shown in the FeatureManager will look different from what you have seen up to this point, as shown in Figure 9.9 We will cover the reason for this later in this chapter

F I g u r e 9 9 New part displayed in the FeatureManager design tree

3 Select Normal To in the Heads-Up View toolbar, or press Ctrl+8 on

the keyboard

4 Using the Line command and making use of autotransitioning to an

arc, duplicate the sketch shown in Figure 9.10 It is important to note the tangencies between the three arcs

N O t e Regardless of the orientation of the shade mount, the sketch of the shade must be drawn in the orientation shown

F I g u r e 9 1 0 Fully defined sketch of the shade component

extrude up to existing geometry

With the sketch for the shade created and fully defined, it is time to create the

base extrusion You will be using the Extruded Boss/Base command, which has

probably become very familiar at this point, but instead of specifying a depth of

extrusion, you will reference a face in the assembly to extrude up to To use the

command in this manner, do the following:

1 Select the Isometric view in the Heads-up View toolbar, or press

Ctrl+7 on your keyboard

2 Select Extruded Boss/Base on the Features tab in the CommandManager.

3 In the Direction1 section of the Boss-Extrude PropertyManager,

select Up To Surface in the End Condition field

4 Select the face of the washer on the other side of the shade mount, as

shown in Figure 9.11

F I g u r e 9 1 1 Terminating the face of the shade model

N O t e Terminating the extrusion of the shade on the face of the ing washer subassembly will allow the extrusion to adjust to any changes in the distance between the two sets of washers

oppos-5 The preview in the graphics area, as shown in Figure 9.12, will show

the shade extending from the sketch and terminating on the other washer If the distance between the two is updated in the shade mount model, the length of the shade will automatically be updated

Click the green check mark to create the shade

F I g u r e 9 1 2 Preview of shade base extrusion

7 The new part will be shown in the FeatureManager, as shown in

Figure 9.13, as a virtual component You can also see in the figure, following the instance count, an arrow made up by a hyphen and a bracket (->) This arrow indicates that the model contains an exter-nal reference The shade references the assembly and the location of the washers to specify the length of the extrusion

F I g u r e 9 1 3 Virtual component in the FeatureManager design tree

Ab o u t Vi r t uA l Co m p o n e n t s

Virtual components are a fairly recent addition to SolidWorks They allow

you to save a component inside the assembly itself without externalizing the component This makes the model exist only in the assembly and not as a part that can be opened separately without first opening the assembly

There are a couple of ways to use virtual components When designing a new component in an assembly, it gives you the opportunity to see how the part fits in your scheme without making the commitment of an external part

Another common practice is to use virtual components for bulk items (glue, grease, solder, and so on) that do not normally require an actual model but should still be displayed in the bill of materials

Save Virtual Components externally

This time when you save the assembly, you will have the opportunity to specify whether the shade model is meant to be an external file or should remain a vir-tual component Since the shade is a stand-alone component, it would probably

be a good thing to save it as an external file This would give you the ability to send the model to a vendor or to create a drawing Perform the following steps

to save the models as an external file:

1 Click Save in the menu bar, or press Ctrl+S to save the work so

far When prompted to save modified documents, as shown in Figure 9.14, click Save All

F I g u r e 9 1 4 Save Modified Documents window

N O t e The Save Modified Documents window is often seen when saving

an assembly that contains referenced components that also need to be saved

2 After clicking Save All, you will be prompted to save the shade part

inter-nally or exterinter-nally Select the Save Exterinter-nally (Specify Paths) option

F I g u r e 9 1 5 Saving the virtual component externally

4 In the Browse For Folder window, specify the folder in which to save

the shade model Click OK to accept the selected folder

5 With Part1 still selected, select the part again to allow you to edit the filename Change the name of the part to Shade, Desk Lamp, and

click OK to save the file (see Figure 9.16)

F I g u r e 9 1 6 Changing the name of the virtual component to be saved

externally

N O t e Virtual components saved in an assembly can also be ized by right-clicking the part in the FeatureManager and selecting Save Part (In External File) in the menu

external-Finish the Shade Model

With the part saved externally, you can now open the model to continue to

model the shade The shade is a pretty simple part, and you can finish the model

while in the assembly, but we often find it can be a bit distracting Just to make

1 In the graphics area, select the shade, and click the Open Part button

in the context toolbar

2 In the shade model, select the Fillet command.

3 In the Items To Fillet section, set the radius of the fillet to 1.000.

4 Select the two top edges of the shade, as shown in Figure 9.17 Click

the green check mark to create the fillets

F I g u r e 9 1 7 Adding fillets to the outside of the shade

Create a Shelled Feature

So far, you have only gone as far as modeling the outside of the shade If you have ever seen a banker’s desk lamp, you will notice one major problem with the shade that you have created so far To complete the rest of the shade subassem-bly, you need to remove the material on the inside of the shade model

You could always add an extruded cut to the model to remove the material

on the inside of the shade, but the fillets make it near impossible to achieve the look that you want here Another option is to move the rollback bar above

things a whole heck of a lot easier, you will instead be using a Shell feature to

finish the model The Shell feature allows you to specify a constant wall

thick-ness on the model with just one feature It also allows you to specify where the

open face of the shade will be The Shell command is a simple tool that will save

you a lot of time To shell out the shade model, follow these steps:

1 In the Features tab in the CommandManager, select the Shell

command

2 In the Parameters section of the Shell PropertyManager, there is

a field labeled D1 This field is used to specify the thickness of the

material after the model is shelled Set the thickness to be 085.

3 Below the D1 field in the Parameters section, the Faces To Remove

field will be highlighted Select the bottom face of the shade to remove the face when the part is shelled, as shown in Figure 9.18 Click the green check mark to shell the part

F I g u r e 9 1 8 Selecting the face of the shade to be removed

Add Holes to the Shade for Mounting

The shade should be looking pretty good by now, but you still need one more

thing before it can be used in the model You need to add a couple of holes to

F I g u r e 9 1 9 Selecting the outside face of the shade for mounting holes

2 Select Normal To in the Heads-up View toolbar, or press Ctrl+8 on

your keyboard

3 With the center coincident with the sketch origin, draw a circle with

the diameter 500″

4 Select Extruded Cut on the Features tab in the CommandManager.

5 Set the end condition of the extruded cut to be Through All, and click

the green check mark

N O t e Using the Though All end condition of the mounting holes ensures that no matter what changes are made to the width of the shade, the mounting holes will always go through both sides of the shade

Add Appearances to the Shade Model

All the necessary features have been added to the model, so at this point you could just save the changes and return to the assembly As far as fit and function are concerned, the part is now complete, but you would be missing out on a great opportunity to add a little flair to the part If you look on the cover of this book, you will see that the shade is made of a semitransparent green glass or plastic to