Thicken surface to solid in Solidworks - Step-by-Step Guide

Introduction

This feature lets you turn a thin surface model into a solid 3D object by adding thickness. It helps when you have a surface and want to create a solid part for manufacturing or analysis.

When you have a surface model of a car door and want to make it a solid part for strength testing.

When you design a thin shell and need to add thickness to create a solid for 3D printing.

When you import a surface from another program and want to convert it into a solid for further editing.

When you want to add material thickness to a flat sheet surface to create a box or container.

When you need to prepare a surface model for simulation that requires a solid volume.

Steps

Step 1: Open your surface model

- SolidWorks main window

The surface model appears in the workspace

Step 2: Click

- Features tab on the CommandManager

Feature tools become visible

Step 3: Select

- Thicken tool in the Features tab

Thicken property manager opens on the left side

Step 4: Select

- Surface body in the graphics area or FeatureManager design tree

Surface is highlighted and selected for thickening

Step 5: Enter

- Thickness box in the Thicken property manager

Thickness value is set, preview shows the solid thickness

Step 6: Choose

- Direction option (One Direction, Two Directions, Mid Plane)

Thickness direction is set and preview updates accordingly

Step 7: Click

- OK button in the Thicken property manager

Surface converts to a solid body with the specified thickness

Before vs After

Before

Model shows only a thin surface with no volume

After

Model shows a solid body with thickness added, visible volume and mass

Settings Reference

Thickness

📍 Thicken property manager

Sets how thick the new solid will be from the original surface

Default: 1 mm

Direction

📍 Thicken property manager

Controls which side(s) of the surface the thickness is added

Default: One Direction

Merge result

📍 Thicken property manager

Determines if the thickened solid merges with existing solids

Default: Checked

Common Mistakes

Entering zero or negative thickness without changing direction

Zero thickness creates no solid; negative thickness without direction can cause errors

Always enter a positive thickness or use direction options to control thickness side

Not selecting the correct surface body

Thicken tool won't work if no surface or wrong surface is selected

Carefully select the intended surface body before applying thickness

Ignoring the Merge result option when multiple solids exist

May create separate bodies instead of one solid, complicating further modeling

Check Merge result to combine thickened solid with existing solids if desired

Summary

Thicken surface to solid adds volume by giving thickness to a surface model.

You control thickness size and direction to create the desired solid shape.

Make sure to select the correct surface and set options like Merge result carefully.

Practice

1. What does the Thicken feature do in SolidWorks when applied to a surface?

easy

A. It adds thickness to the surface, converting it into a solid body.

B. It removes the surface from the model.

C. It changes the color of the surface without affecting geometry.

D. It splits the surface into multiple smaller surfaces.

Solution

1. Step 1: Understand the purpose of the Thicken feature

   The Thicken feature is used to add thickness to a surface, which by itself has no volume.

2. Step 2: Effect of adding thickness

   By adding thickness, the surface becomes a solid body with volume, enabling further solid modeling operations.

3. Final Answer:

   It adds thickness to the surface, converting it into a solid body. -> Option A

4. Quick Check:

   Thicken converts surface to solid [OK]

Hint: Thicken means add thickness to make a solid [OK]

Common Mistakes:

• Thinking Thicken only changes color
• Assuming Thicken removes surfaces
• Confusing Thicken with splitting surfaces

2. Which of the following is the correct way to specify thickness in the Thicken feature dialog in SolidWorks?

easy

A. Thickness value is ignored; thickness is fixed.

B. Enter a negative value to thicken outward, positive to thicken inward.

C. Thickness value must always be zero.

D. Enter a positive value to thicken outward, negative to thicken inward.

Solution

1. Step 1: Understand thickness direction

   Positive thickness grows the surface outward, increasing size; negative thickness grows inward, reducing size.

2. Step 2: Confirm correct sign usage

   Entering positive values thickens outward; negative values thicken inward, as per SolidWorks convention.

3. Final Answer:

   Enter a positive value to thicken outward, negative to thicken inward. -> Option D

4. Quick Check:

   Positive = outward, negative = inward thickness [OK]

Hint: Positive thickness grows outward, negative inward [OK]

Common Mistakes:

• Reversing positive and negative thickness meaning
• Entering zero thickness expecting change
• Ignoring thickness sign causing errors

3. Given a flat square surface of 10mm by 10mm, if you apply a Thicken feature with thickness 2mm outward, what will be the volume of the resulting solid?

medium

A. 20 cubic millimeters

B. 200 cubic millimeters

C. 100 cubic millimeters

D. 400 cubic millimeters

Solution

1. Step 1: Calculate base area of the surface

   The surface is 10mm by 10mm, so area = 10 * 10 = 100 mm².

2. Step 2: Calculate volume by multiplying area by thickness

   Thickness is 2mm outward, so volume = 100 mm² * 2 mm = 200 mm³.

3. Final Answer:

   200 cubic millimeters -> Option B

4. Quick Check:

   Area * thickness = volume = 200 mm³ [OK]

Hint: Volume = surface area x thickness [OK]

Common Mistakes:

• Using thickness as 0.2 instead of 2
• Calculating area incorrectly
• Confusing volume with surface area

4. You applied a Thicken feature with thickness -3mm on a curved surface, but the feature failed. What is the most likely cause?

medium

A. Negative thickness caused the solid to self-intersect or collapse.

B. Thickness value must be positive only.

C. Surface must be flat to thicken.

D. Thicken feature does not work on curved surfaces.

Solution

1. Step 1: Understand negative thickness effect

   Negative thickness grows inward, which can cause geometry to overlap or collapse if thickness is too large.

2. Step 2: Identify failure reason

   The failure is likely due to self-intersecting geometry caused by inward thickening beyond surface limits.

3. Final Answer:

   Negative thickness caused the solid to self-intersect or collapse. -> Option A

4. Quick Check:

   Negative thickness can cause geometry errors [OK]

Hint: Check for self-intersection when using negative thickness [OK]

Common Mistakes:

• Assuming thickness must be positive only
• Believing curved surfaces cannot be thickened
• Ignoring preview errors before confirming

5. You have a complex surface model with multiple open edges. You want to create a solid by thickening it 1.5mm outward. What should you do to ensure the Thicken feature works correctly?

hard

A. Use negative thickness to avoid errors with open edges.

B. Apply Thicken directly; open edges do not affect solid creation.

C. Close all open edges or use surface knitting before applying Thicken.

D. Convert the surface to mesh before thickening.

Solution

1. Step 1: Recognize importance of closed surfaces

   Thicken requires a closed or knitted surface to create a valid solid without gaps.

2. Step 2: Prepare the surface model

   Close open edges by patching or knitting surfaces to form a watertight model before thickening.

3. Step 3: Apply Thicken feature

   Once the surface is closed, apply 1.5mm outward thickness to create a solid successfully.

4. Final Answer:

   Close all open edges or use surface knitting before applying Thicken. -> Option C

5. Quick Check:

   Closed surfaces needed for thickening [OK]

Hint: Close open edges before thickening surfaces [OK]

Common Mistakes:

• Trying to thicken open surfaces directly
• Using negative thickness to fix open edges
• Ignoring surface preparation steps