Revolved surface in Solidworks - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the axis of revolution in a revolved surface

In SolidWorks, when creating a revolved surface, which statement best describes the role of the axis of revolution?

A It is the plane on which the sketch profile is drawn.

B It is the edge of the sketch profile that is extruded linearly.

C It defines the line around which the sketch profile is rotated to create the surface.

D It determines the thickness of the revolved surface.

💡 Hint

Think about what happens when you spin a shape around a line.

The axis of revolution is the line around which the 2D sketch profile is rotated to form the 3D revolved surface.

❓ dax_lod_result

intermediate

Calculating total revolved surface area from parameters

You have a revolved surface created by rotating a semicircle of radius 5 units around its diameter. What is the total surface area of the revolved surface?

A 100 square units

B 78.54 square units

C 157.08 square units

D 314.16 square units

💡 Hint

Recall the formula for the surface area of a sphere and how a semicircle rotation relates to it.

Rotating a semicircle around its diameter creates a sphere. Surface area of a sphere = 4πr². Here, r=5, so area = 4 * π * 25 = 314.16. Since the semicircle is rotated, the revolved surface is the sphere surface, so total surface area is 314.16. The correct answer is 314.16 square units.

❓ visualization

advanced

Choosing the best visualization for revolved surface thickness analysis

You want to create a dashboard to analyze the thickness distribution of a revolved surface model in SolidWorks. Which visualization type best helps to show thickness variations clearly?

A Heat map overlay on the 3D model showing thickness gradients

B Pie chart showing percentage of thickness ranges

C Simple bar chart of average thickness per section

D Line chart of thickness over time

💡 Hint

Think about how to show spatial variation on a 3D shape.

A heat map overlay on the 3D model visually shows where thickness is higher or lower directly on the surface, making it easier to understand spatial distribution.

🔧 Formula Fix

advanced

Identifying the error in revolved surface creation

In SolidWorks, a user tries to create a revolved surface but gets an error. The sketch profile is a closed shape, and the axis of revolution is a line inside the profile. What is the most likely cause of the error?

A The axis of revolution cannot intersect the sketch profile.

B The axis of revolution must be outside the closed sketch profile.

C The sketch profile must be open, not closed.

D The sketch profile must be on a different plane than the axis.

💡 Hint

Think about what happens when the axis crosses the profile during rotation.

The axis of revolution cannot intersect the sketch profile because the rotation would cause self-intersecting geometry, which SolidWorks cannot process.

🎯 Scenario

expert

Optimizing revolved surface design for manufacturing

You are designing a revolved surface part that must be manufactured with minimal material waste. Which approach best helps optimize the design for this goal?

A Maximize the revolved angle beyond 360 degrees for strength.

B Use a thin revolved surface with uniform thickness and minimize overhangs.

C Create a thick revolved surface with complex internal features.

D Use multiple revolved surfaces stacked without merging.

💡 Hint

Think about how thickness and shape complexity affect material use.

Using a thin, uniform thickness revolved surface reduces material use and simplifies manufacturing. Minimizing overhangs also helps reduce waste and machining difficulty.

Practice

1. What is the main purpose of a Revolved Surface in SolidWorks?

easy

A. To create a 3D shape by spinning a 2D sketch around an axis

B. To extrude a 2D sketch in a straight line

C. To cut a hole through a solid body

D. To mirror a part across a plane

Solution

1. Step 1: Understand the Revolved Surface concept

   A revolved surface is created by rotating a 2D profile around a fixed axis.

2. Step 2: Compare with other features

   Extrusion extends a sketch linearly, cutting removes material, mirroring duplicates. Only revolving spins the sketch.

3. Final Answer:

   To create a 3D shape by spinning a 2D sketch around an axis -> Option A

4. Quick Check:

   Revolve = spin sketch around axis [OK]

Hint: Revolve means spin a sketch around an axis [OK]

Common Mistakes:

• Confusing revolve with extrusion
• Thinking revolve cuts material
• Mixing revolve with mirroring

2. Which of the following is the correct syntax to create a revolved surface in SolidWorks using the API method CreateRevolvedSurface?

easy

A. CreateRevolvedSurface(axisLine, profileSketch, angle)

B. CreateRevolvedSurface(profileSketch, axisLine, angle)

C. CreateRevolvedSurface(profileSketch, angle, axisLine)

D. CreateRevolvedSurface(angle, profileSketch, axisLine)

Solution

1. Step 1: Identify parameter order in API

   The method requires the profile sketch first, then the axis line, then the angle of revolution.

2. Step 2: Match parameters to options

   Only CreateRevolvedSurface(profileSketch, axisLine, angle) follows the correct order: profileSketch, axisLine, angle.

3. Final Answer:

   CreateRevolvedSurface(profileSketch, axisLine, angle) -> Option B

4. Quick Check:

   Profile, Axis, Angle order [OK]

Hint: Remember: Profile first, then axis, then angle [OK]

Common Mistakes:

• Swapping axis and profile parameters
• Putting angle before axis
• Incorrect parameter order causing errors

3. Given a 2D sketch of a semicircle and an axis line, what will be the shape created by revolving the sketch 360 degrees around the axis?

medium

A. A hollow cylinder

B. A solid hemisphere

C. A torus (doughnut shape)

D. A sphere

Solution

1. Step 1: Understand the semicircle revolution

   Revolving a semicircle 360 degrees around its diameter axis creates a full sphere.

2. Step 2: Eliminate other shapes

   A hollow cylinder needs a rectangle, a torus needs a circle offset from axis, hemisphere is half sphere.

3. Final Answer:

   A sphere -> Option D

4. Quick Check:

   Semicircle revolve 360° = sphere [OK]

Hint: Semicircle spun fully makes a sphere [OK]

Common Mistakes:

• Thinking it creates a cylinder
• Confusing torus with sphere
• Assuming hemisphere instead of full sphere

4. You tried to create a revolved surface but got an error saying "Axis not defined". What is the most likely cause?

medium

A. The axis line was not selected or missing

B. The angle of revolution is zero

C. The profile sketch is not closed

D. The sketch is not on the correct plane

Solution

1. Step 1: Analyze the error message

   "Axis not defined" means the software cannot find the axis to revolve around.

2. Step 2: Identify common causes

   Most likely the axis line was not selected or missing in the feature setup.

3. Final Answer:

   The axis line was not selected or missing -> Option A

4. Quick Check:

   Missing axis line causes "Axis not defined" error [OK]

Hint: Always select axis line before revolving [OK]

Common Mistakes:

• Ignoring axis selection
• Assuming profile closure causes axis error
• Not checking angle value

5. You want to create a revolved surface for a bottle shape using a 2D profile sketch. The profile is open at the top and you revolve it 270 degrees around the vertical axis. What will be the result?

hard

A. A solid cylinder

B. A fully closed bottle shape

C. A partial bottle shape with an open side

D. An error because the profile is open

Solution

1. Step 1: Consider the open profile and revolution angle

   An open profile revolved less than 360 degrees creates a partial surface with an open side.

2. Step 2: Understand the effect of 270 degrees revolution

   Since 270° is less than full circle, the shape will not close fully, leaving a gap.

3. Final Answer:

   A partial bottle shape with an open side -> Option C

4. Quick Check:

   Open profile + 270° revolve = partial open shape [OK]

Hint: Less than 360° revolve + open profile = open partial shape [OK]

Common Mistakes:

• Assuming partial revolve closes shape
• Thinking open profile causes error
• Confusing partial revolve with full revolve