Sub-assembly creation in Solidworks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a sub-assembly in SolidWorks?

A sub-assembly is a smaller assembly created within a larger assembly. It groups related parts together to simplify the main assembly.

beginner

Why use sub-assemblies in a SolidWorks project?

Sub-assemblies help organize complex models, improve performance, and make it easier to manage and reuse parts.

beginner

How do you create a sub-assembly in SolidWorks?

You create a new assembly file, insert parts, save it, then insert this assembly into the main assembly as a sub-assembly.

beginner

What is the difference between a sub-assembly and a part?

A part is a single 3D object, while a sub-assembly is a group of parts combined to act as one unit inside a bigger assembly.

intermediate

How does using sub-assemblies affect assembly performance?

Sub-assemblies reduce the load on the main assembly by managing smaller groups of parts, making the model faster and easier to work with.

What is the first step to create a sub-assembly in SolidWorks?

A Create a new assembly file

B Insert parts into the main assembly

C Save the main assembly

D Export the assembly as a part

You start by creating a new assembly file to group parts before inserting it into the main assembly.

Which of these is NOT a benefit of using sub-assemblies?

A Faster assembly performance

B Automatically fixes design errors

C Improved organization

D Easier reuse of parts

Sub-assemblies help organize and speed up work but do not automatically fix design errors.

How does a sub-assembly appear in the main assembly?

A As a single grouped unit

B As separate individual parts

C As a 2D sketch

D As a part file

A sub-assembly appears as one grouped unit inside the main assembly.

What happens if you edit a part inside a sub-assembly?

A The sub-assembly breaks

B The main assembly stays the same

C The change updates in the main assembly

D The part becomes a new assembly

Editing a part inside a sub-assembly updates it everywhere it is used, including the main assembly.

Which file type is used to save a sub-assembly?

A .sldprt

B .step

C .dwg

D .sldasm

Sub-assemblies are saved as SolidWorks assembly files with the extension .sldasm.

Explain the process of creating and using a sub-assembly in SolidWorks.

Think about how you group parts before adding them to the big model.

Describe the benefits of using sub-assemblies in managing complex SolidWorks projects.

Consider how breaking a big task into smaller parts helps.

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