Undercut detection in Solidworks - Real Business Scenario

Scenario Mode

👤 Your Role: You are a product design analyst at a manufacturing company.

📋 Request: Your manager wants you to identify undercuts in the latest 3D model to ensure the mold design is manufacturable without additional complex tooling.

📊 Data: You have access to the 3D CAD model of the product in SolidWorks, including all surfaces and features.

🎯 Deliverable: Produce a report with visual highlights of undercut areas on the model and a summary table listing each undercut feature with its location and size.

Sample Data

Feature ID	Feature Type	Location (X,Y,Z)	Size (mm)	Undercut Detected
F101	Boss	(12, 45, 30)	5	Yes
F102	Cut	(25, 60, 15)	3	No
F103	Fillet	(18, 50, 40)	2	Yes
F104	Hole	(30, 55, 20)	4	No
F105	Slot	(22, 48, 35)	6	Yes
F106	Chamfer	(15, 52, 25)	1	No
F107	Rib	(20, 47, 33)	3	Yes
F108	Cut	(28, 53, 18)	2	No

1

Step 1: Open the 3D CAD model in SolidWorks and prepare it for undercut analysis.

Load the model file and ensure all features are visible and selectable.

Expected Result

Model is fully loaded and ready for analysis.

2

Step 2: Use the Undercut Detection tool in SolidWorks to scan the entire model.

Go to Tools > Undercut Detection, select the part, and run the detection with default settings.

Expected Result

Undercut areas are highlighted in red on the 3D model.

3

Step 3: Review the highlighted undercut areas and note their feature IDs and locations.

Click on each highlighted area to see feature details in the PropertyManager.

Expected Result

Identified undercuts: F101, F103, F105, F107 with their locations and sizes.

4

Step 4: Create a summary table listing each undercut feature with its ID, type, location, and size.

Manually compile data from the model and detection results into a table format.

Expected Result

Summary table matches the sample data undercut rows.

5

Step 5: Capture screenshots of the model with undercuts highlighted for the report.

Use SolidWorks screenshot tool or print screen, focusing on each undercut area.

Expected Result

Clear images showing red highlighted undercuts ready for report inclusion.

6

Step 6: Compile a report including the summary table and screenshots to present to the manager.

Use a document editor to combine text, table, and images with clear labels.

Expected Result

Report clearly shows undercut locations and sizes with visual evidence.

Final Result

Undercut Detection Report
=========================

Feature ID | Type   | Location (X,Y,Z) | Size (mm) | Undercut
------------------------------------------------------------
F101       | Boss   | (12, 45, 30)    | 5         | Yes
F103       | Fillet | (18, 50, 40)    | 2         | Yes
F105       | Slot   | (22, 48, 35)    | 6         | Yes
F107       | Rib    | (20, 47, 33)    | 3         | Yes

[Model images with red highlights on undercuts included in report]

✓Four features have undercuts that may require special mold tooling.

✓Undercuts are located mainly around mid-section features like Boss, Fillet, Slot, and Rib.

✓Early detection helps avoid costly mold redesign and manufacturing delays.

Bonus Challenge

Automate the undercut detection report generation using SolidWorks API to extract undercut data and create the summary table and images.

Show Hint

Use SolidWorks API methods to access feature properties and the Undercut Detection tool programmatically, then export data to Excel or PDF.

Practice

1. What is the main purpose of undercut detection in SolidWorks molding design?

easy

A. To find areas that may cause problems during mold release

B. To calculate the weight of the molded part

C. To determine the color of the plastic material

D. To measure the surface roughness of the mold

Solution

1. Step 1: Understand undercut detection purpose

   Undercut detection identifies areas that can trap the part in the mold.

2. Step 2: Relate to molding process

   These problem areas affect mold release and manufacturing quality.

3. Final Answer:

   To find areas that may cause problems during mold release -> Option A

4. Quick Check:

   Undercut detection = problem areas in molding [OK]

Hint: Think about what stops a part from coming out of a mold [OK]

Common Mistakes:

• Confusing undercut detection with weight calculation
• Thinking it measures color or surface finish
• Assuming it checks material properties

2. Which step is essential before running undercut detection in SolidWorks?

easy

A. Adding fillets to all edges

B. Applying a texture to the model

C. Changing the color of the part

D. Setting the correct pull direction

Solution

1. Step 1: Identify key setup for undercut detection

   The pull direction defines how the mold opens and affects detection results.

2. Step 2: Understand impact of pull direction

   Incorrect pull direction leads to wrong undercut identification.

3. Final Answer:

   Setting the correct pull direction -> Option D

4. Quick Check:

   Pull direction setup = correct undercut detection [OK]

Hint: Always set pull direction before checking undercuts [OK]

Common Mistakes:

• Skipping pull direction setup
• Confusing texture or color with detection setup
• Thinking fillets affect undercut detection directly

3. Given a part with a pull direction set incorrectly, what is the likely output of the undercut detection tool?

medium

A. The tool crashes with an error

B. All edges flagged as undercuts

C. No undercuts detected even if they exist

D. Undercuts detected only on flat surfaces

Solution

1. Step 1: Analyze effect of wrong pull direction

   Wrong pull direction means the tool looks from the wrong angle.

2. Step 2: Predict detection result

   It misses real undercuts, showing none detected.

3. Final Answer:

   No undercuts detected even if they exist -> Option C

4. Quick Check:

   Wrong pull direction = missed undercuts [OK]

Hint: Wrong pull direction hides real undercuts [OK]

Common Mistakes:

• Assuming tool crashes on wrong pull direction
• Thinking all edges get flagged
• Believing detection only works on flat surfaces

4. You ran undercut detection but the results seem incorrect. Which of the following is the most likely cause?

medium

A. The pull direction was not set properly

B. The part color was changed after detection

C. The model has no fillets

D. The software version is outdated

Solution

1. Step 1: Identify common error in detection setup

   Incorrect pull direction is the main cause of wrong undercut results.

2. Step 2: Eliminate unrelated causes

   Color changes, fillets, or software version usually do not affect detection output directly.

3. Final Answer:

   The pull direction was not set properly -> Option A

4. Quick Check:

   Incorrect pull direction = wrong detection results [OK]

Hint: Check pull direction first when results look wrong [OK]

Common Mistakes:

• Blaming color or fillets for detection errors
• Ignoring pull direction setup
• Assuming software version causes detection errors

5. You have a complex molded part with multiple undercuts. How can you use SolidWorks undercut detection to improve your design for manufacturing?

hard

A. Ignore undercuts and rely on manual inspection only

B. Set the correct pull direction, identify undercuts, then modify design to remove or reduce them

C. Change the part color to highlight problem areas

D. Add fillets to all edges without checking undercuts

Solution

1. Step 1: Use undercut detection properly

   Set the pull direction correctly to get accurate undercut locations.

2. Step 2: Modify design based on detection

   Adjust or remove undercuts to ease mold release and reduce manufacturing issues.

3. Step 3: Avoid ineffective actions

   Ignoring undercuts or just changing colors does not solve molding problems.

4. Final Answer:

   Set the correct pull direction, identify undercuts, then modify design to remove or reduce them -> Option B

5. Quick Check:

   Correct pull direction + design changes = better molding [OK]

Hint: Detect undercuts, then redesign to avoid molding problems [OK]

Common Mistakes:

• Ignoring undercuts in design process
• Thinking color changes fix molding issues
• Adding fillets without checking undercuts