Sub-assembly creation in Solidworks - Real Business Scenario

Scenario Mode

👤 Your Role: You are a mechanical design engineer at a manufacturing company.

📋 Request: Your manager wants you to organize the main product assembly by creating sub-assemblies for better design management and easier updates.

📊 Data: You have a list of individual parts and components that make up the main product assembly. Each part has a name, part number, and belongs to a functional group.

🎯 Deliverable: Create sub-assemblies grouping related parts, then build the main assembly referencing these sub-assemblies. Provide a report showing the sub-assemblies and their parts.

Sample Data

Part Number	Part Name	Functional Group
1001	Base Plate	Frame
1002	Support Bracket	Frame
2001	Motor	Drive
2002	Gearbox	Drive
3001	Control Panel	Electronics
3002	Wiring Harness	Electronics
4001	Cover Plate	Housing
4002	Fasteners	Housing

1

Step 1: Open SolidWorks and create a new assembly document named 'Main Assembly'.

File > New > Assembly > Save as 'Main Assembly.sldasm'

Expected Result

A blank assembly workspace ready for components.

2

Step 2: Create a new sub-assembly for the 'Frame' functional group.

File > New > Assembly > Insert parts 1001 and 1002 > Save as 'Frame Sub-assembly.sldasm'

Expected Result

Sub-assembly 'Frame' containing Base Plate and Support Bracket.

3

Step 3: Create a new sub-assembly for the 'Drive' functional group.

File > New > Assembly > Insert parts 2001 and 2002 > Save as 'Drive Sub-assembly.sldasm'

Expected Result

Sub-assembly 'Drive' containing Motor and Gearbox.

4

Step 4: Create a new sub-assembly for the 'Electronics' functional group.

File > New > Assembly > Insert parts 3001 and 3002 > Save as 'Electronics Sub-assembly.sldasm'

Expected Result

Sub-assembly 'Electronics' containing Control Panel and Wiring Harness.

5

Step 5: Create a new sub-assembly for the 'Housing' functional group.

File > New > Assembly > Insert parts 4001 and 4002 > Save as 'Housing Sub-assembly.sldasm'

Expected Result

Sub-assembly 'Housing' containing Cover Plate and Fasteners.

6

Step 6: Insert all sub-assemblies into the 'Main Assembly' document.

Insert > Component > Existing Sub-assemblies: Frame, Drive, Electronics, Housing

Expected Result

Main Assembly contains all four sub-assemblies positioned for final assembly.

7

Step 7: Save the 'Main Assembly' and generate a parts list report showing sub-assemblies and their parts.

Insert > Tables > Bill of Materials > Configure to show sub-assemblies and parts > Export report

Expected Result

A report listing each sub-assembly with its included parts.

Final Result

Main Assembly Dashboard
-----------------------
| Frame Sub-assembly   |
| - Base Plate         |
| - Support Bracket    |
-----------------------
| Drive Sub-assembly   |
| - Motor              |
| - Gearbox            |
-----------------------
| Electronics Sub-assembly |
| - Control Panel      |
| - Wiring Harness     |
-----------------------
| Housing Sub-assembly |
| - Cover Plate        |
| - Fasteners          |
-----------------------

✓Sub-assemblies group related parts logically by function.

✓This organization simplifies assembly updates and design changes.

✓The main assembly references sub-assemblies, reducing complexity.

Bonus Challenge

Create a configuration in one sub-assembly to represent two different versions of the product frame.

Show Hint

Use SolidWorks configurations to create variations within the 'Frame Sub-assembly' and switch between them in the main assembly.

Practice

1.

What is the main purpose of creating a sub-assembly in SolidWorks?

easy

A. To group related parts for easier management

B. To create a new part from scratch

C. To export the assembly as a 2D drawing

D. To change the color of parts automatically

Solution

1. Step 1: Understand sub-assembly concept

   Sub-assemblies group related parts to manage them easily within a larger assembly.

2. Step 2: Compare options

   Options A, B, and D describe unrelated tasks, not the main purpose of sub-assemblies.

3. Final Answer:

   To group related parts for easier management -> Option A

4. Quick Check:

   Sub-assembly = Group parts [OK]

Hint: Remember: sub-assemblies simplify complex assemblies [OK]

Common Mistakes:

• Confusing sub-assembly with part creation
• Thinking sub-assembly changes part colors
• Assuming sub-assembly exports drawings

2.

Which of the following is the correct way to create a sub-assembly in SolidWorks?

1. Insert parts into a new assembly document
2. Save the assembly with a clear name
3. Use the sub-assembly inside a larger assembly

easy

A. Create a new part, then save as sub-assembly

B. Export parts as separate files and link them

C. Open a drawing and add parts as sub-assembly

D. Insert parts into a new assembly, save it, then use it inside a larger assembly

Solution

1. Step 1: Identify correct sub-assembly creation steps

   Insert parts into a new assembly document, save it clearly, then use it inside a bigger assembly.

2. Step 2: Eliminate incorrect options

   Create a new part, then save as sub-assembly creates a part, not a sub-assembly. Open a drawing and add parts as sub-assembly uses drawings incorrectly. Export parts as separate files and link them exports parts separately, not sub-assembly.

3. Final Answer:

   Insert parts into a new assembly, save it, then use it inside a larger assembly -> Option D

4. Quick Check:

   Sub-assembly steps = Insert + Save + Use [OK]

Hint: Think: assemble parts first, then save as sub-assembly [OK]

Common Mistakes:

• Saving a part as sub-assembly
• Trying to create sub-assembly inside a drawing
• Not saving the assembly before using it

3.

Given a main assembly with two sub-assemblies, each containing 3 parts, how many total parts will the main assembly show?

medium

A. 2

B. 3

C. 6

D. 9

Solution

1. Step 1: Calculate parts in each sub-assembly

   Each sub-assembly has 3 parts, so 2 sub-assemblies have 3 x 2 = 6 parts.

2. Step 2: Add parts from sub-assemblies to main assembly

   Main assembly includes all parts from sub-assemblies, so total parts = 6.

3. Step 3: Check if main assembly has extra parts

   Since main assembly contains 2 sub-assemblies only, total parts = 6 parts inside sub-assemblies plus 0 extra parts = 6.

4. Final Answer:

   6 -> Option C

5. Quick Check:

   2 sub-assemblies x 3 parts = 6 parts [OK]

Hint: Multiply sub-assemblies by parts inside each [OK]

Common Mistakes:

• Counting sub-assemblies as parts
• Adding sub-assemblies and parts incorrectly
• Ignoring parts inside sub-assemblies

4.

What is wrong with this sub-assembly creation process?

1. Insert parts into assembly
2. Save assembly as a part file (.sldprt)
3. Use it inside main assembly

medium

A. Inserting parts before saving is wrong

B. Saving assembly as a part file is incorrect

C. Using sub-assembly inside main assembly is not allowed

D. Parts should be inserted after saving

Solution

1. Step 1: Identify file type error

   Assemblies must be saved as assembly files (.sldasm), not part files (.sldprt).

2. Step 2: Confirm correct workflow

   Insert parts, save as assembly file, then use inside main assembly.

3. Final Answer:

   Saving assembly as a part file is incorrect -> Option B

4. Quick Check:

   Assembly file extension = .sldasm [OK]

Hint: Save assemblies as .sldasm, not .sldprt [OK]

Common Mistakes:

• Saving assemblies as part files
• Confusing file extensions
• Thinking parts insert order matters

5.

You have a complex assembly with 50 parts. To improve performance, you want to create sub-assemblies. Which approach is best?

hard

A. Group related parts into sub-assemblies and save them separately

B. Keep all parts in one assembly without sub-assemblies

C. Create sub-assemblies but do not save them separately

D. Convert all parts into drawings before assembly

Solution

1. Step 1: Understand performance benefits

   Grouping related parts into sub-assemblies reduces complexity and improves performance.

2. Step 2: Importance of saving sub-assemblies

   Saving sub-assemblies separately allows reuse and better management.

3. Step 3: Evaluate other options

   Keeping all parts together slows performance; not saving sub-assemblies loses benefits; converting parts to drawings is unrelated.

4. Final Answer:

   Group related parts into sub-assemblies and save them separately -> Option A

5. Quick Check:

   Sub-assemblies + save separately = better performance [OK]

Hint: Save sub-assemblies separately to improve performance [OK]

Common Mistakes:

• Not saving sub-assemblies separately
• Keeping all parts in one big assembly
• Confusing drawings with assemblies