Interference check in assemblies in Solidworks - Real Business Scenario

Scenario Mode

👤 Your Role: You are a mechanical design engineer working with SolidWorks assemblies.

📋 Request: Your manager wants you to identify any physical interferences between parts in a complex assembly to ensure proper fit and function before manufacturing.

📊 Data: You have a SolidWorks assembly file containing multiple parts assembled together. Each part has its 3D geometry defined.

🎯 Deliverable: Produce a report listing all detected interferences between parts, including the names of the interfering components and the volume of interference. Also, create a visualization highlighting the interference areas in the assembly.

Sample Data

Component 1	Component 2	Interference Volume (mm³)
Gear_A	Housing_B	12.5
Shaft_C	Bracket_D	0
Cover_E	Frame_F	3.2
Pin_G	Plate_H	0
Spring_I	Lever_J	0
Bolt_K	Nut_L	0
Cam_M	Follower_N	7.8
Seal_O	Pipe_P	0

1

Step 1: Open the assembly file in SolidWorks.

File > Open > Select assembly file

Expected Result

Assembly loads with all parts visible.

2

Step 2: Access the Interference Detection tool.

Go to Evaluate tab > Click Interference Detection

Expected Result

Interference Detection dialog box opens.

3

Step 3: Select all components in the assembly for interference check.

In Interference Detection dialog, select 'Select All Components' checkbox

Expected Result

All parts are selected for interference analysis.

4

Step 4: Run the interference check.

Click 'Calculate' button in Interference Detection dialog

Expected Result

List of interfering component pairs with interference volumes appears.

5

Step 5: Review the interference results and note components with non-zero interference volume.

Check the interference list for entries where volume > 0

Expected Result

Detected interferences: Gear_A & Housing_B (12.5 mm³), Cover_E & Frame_F (3.2 mm³), Cam_M & Follower_N (7.8 mm³).

6

Step 6: Highlight interference areas in the assembly visualization.

Select each interference pair in the list and click 'Highlight' button

Expected Result

Interference regions are visually highlighted in the 3D assembly view.

7

Step 7: Export the interference report.

Click 'Save Report' in Interference Detection dialog and save as PDF or Excel

Expected Result

Report file saved containing interference details and volumes.

Final Result

Visualization

↓

Gear_A

↓

Cover_E

↓

Cam_M

✓Three pairs of components have physical interferences that need design review.

✓Gear_A and Housing_B have the largest interference volume (12.5 mm³).

✓Visual highlights help quickly locate interference areas in the assembly.

Bonus Challenge

Automate the interference check process using SolidWorks API to generate reports for multiple assemblies.

Show Hint

Use SolidWorks API methods like IAssemblyDoc::GetInterference and automate report export with VBA or C# scripts.

Practice

1. What is the main purpose of the Interference Check tool in SolidWorks assemblies?

easy

A. To find overlapping or colliding parts in an assembly

B. To measure the weight of the assembly

C. To create exploded views of the assembly

D. To generate a bill of materials

Solution

1. Step 1: Understand the function of Interference Check

   The Interference Check tool is designed to detect if any parts in an assembly overlap or collide.

2. Step 2: Compare with other options

   Measuring weight, creating exploded views, and generating bills of materials are different tools and functions in SolidWorks.

3. Final Answer:

   To find overlapping or colliding parts in an assembly -> Option A

4. Quick Check:

   Interference Check = Find overlapping parts [OK]

Hint: Interference Check = find collisions between parts [OK]

Common Mistakes:

• Confusing interference check with weight measurement
• Thinking it creates exploded views
• Assuming it generates bills of materials

2. Which of the following is the correct sequence to start an interference check in a SolidWorks assembly?

easy

A. Go to Evaluate tab > Click Interference Detection > Select components > Run check

B. Go to Features tab > Click Interference Detection > Select components > Run check

C. Go to Sketch tab > Click Interference Detection > Select components > Run check

D. Go to Insert tab > Click Interference Detection > Select components > Run check

Solution

1. Step 1: Locate Interference Detection tool in SolidWorks

   The Interference Detection tool is found under the Evaluate tab in the assembly environment.

2. Step 2: Confirm the correct workflow

   The correct steps are to go to Evaluate tab, click Interference Detection, select components, then run the check.

3. Final Answer:

   Go to Evaluate tab > Click Interference Detection > Select components > Run check -> Option A

4. Quick Check:

   Evaluate tab contains Interference Detection [OK]

Hint: Interference check is under Evaluate tab in assemblies [OK]

Common Mistakes:

• Looking for Interference Detection under Features tab
• Searching in Sketch or Insert tabs
• Skipping component selection before running check

3. Consider an assembly with three parts: Part A, Part B, and Part C. You run an interference check selecting all parts. The tool reports 2 interferences. Which of the following is a possible explanation?

medium

A. No parts overlap; the tool is malfunctioning

B. Part A overlaps with Part B only, Part C is separate

C. Part A overlaps with Part B and Part B overlaps with Part C

D. All three parts overlap in one single interference

Solution

1. Step 1: Understand interference count meaning

   Each interference reported corresponds to a unique overlapping pair or group of parts.

2. Step 2: Analyze the options

   If there are 2 interferences, it means two separate overlaps exist, such as Part A with Part B and Part B with Part C.

3. Final Answer:

   Part A overlaps with Part B and Part B overlaps with Part C -> Option C

4. Quick Check:

   2 interferences = 2 overlapping pairs [OK]

Hint: Number of interferences = number of overlapping pairs [OK]

Common Mistakes:

• Assuming one interference means all parts overlap
• Thinking zero interferences means overlaps exist
• Confusing interference count with number of parts

4. You run an interference check but the tool reports no interferences even though you see parts visibly overlapping. What is the most likely cause?

medium

A. The parts are touching but not overlapping

B. You forgot to select all components before running the check

C. Interference check only works on parts, not assemblies

D. The assembly is corrupted and needs repair

Solution

1. Step 1: Verify component selection for interference check

   The interference check only analyzes selected components. If some parts are not selected, overlaps may be missed.

2. Step 2: Evaluate other options

   Assembly corruption is rare and would cause errors, not silent misses. The tool works on assemblies. Touching parts do not count as interference.

3. Final Answer:

   You forgot to select all components before running the check -> Option B

4. Quick Check:

   All parts must be selected for interference check [OK]

Hint: Always select all parts before running interference check [OK]

Common Mistakes:

• Assuming touching parts cause interference
• Ignoring component selection step
• Blaming assembly corruption without evidence

5. You have an assembly with multiple moving parts. You want to check if any parts interfere during motion. Which approach should you use in SolidWorks to detect interferences throughout the motion?

hard

A. Run Interference Check on the static assembly only

B. Export parts and check interference in a separate CAD tool

C. Manually inspect each position without using tools

D. Use the Motion Study with Collision Detection enabled

Solution

1. Step 1: Understand interference check limitations

   The standard Interference Check runs on static assemblies and does not analyze motion.

2. Step 2: Use Motion Study with Collision Detection

   SolidWorks Motion Study allows simulating movement and detecting collisions dynamically during motion.

3. Step 3: Evaluate other options

   Exporting parts or manual inspection is inefficient and error-prone compared to built-in motion collision detection.

4. Final Answer:

   Use the Motion Study with Collision Detection enabled -> Option D

5. Quick Check:

   Motion Study + Collision Detection = dynamic interference check [OK]

Hint: Use Motion Study with collision detection for moving parts [OK]

Common Mistakes:

• Running interference check only on static assembly
• Ignoring motion and collisions during movement
• Relying on manual inspection instead of tools