REVOLVE command in AutoCAD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to start the revolve operation in AutoCAD.

AutoCAD

Type [1] to begin revolving a 2D object around an axis.

Drag options to blanks, or click blank then click option'

AEXTRUDE

BROTATE

CSWEEP

DREVOLVE

Attempts:

3 left

💡 Hint

Common Mistakes

Typing ROTATE instead of REVOLVE.

Using EXTRUDE which pushes shapes linearly, not around an axis.

The REVOLVE command creates a 3D solid or surface by revolving a 2D object around an axis.

2fill in blank

medium

Complete the step to select the axis of revolution after starting the REVOLVE command.

AutoCAD

After selecting the object, specify the [1] to revolve around.

Drag options to blanks, or click blank then click option'

Abase point

Bcenter point

Caxis of revolution

Dreference line

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a base point instead of an axis.

Confusing the axis with the center point of the object.

The axis of revolution is the line around which the object spins to create the 3D shape.

3fill in blank

hard

Fix the error in the revolve angle input to revolve the object fully around the axis.

AutoCAD

When prompted for the angle of revolution, enter [1] to revolve the object 360 degrees.

Drag options to blanks, or click blank then click option'

A360

B90

C180

D45

Attempts:

3 left

💡 Hint

Common Mistakes

Entering 180 degrees which only revolves half the shape.

Entering 90 or 45 degrees which revolve only a quarter or less.

Entering 360 degrees revolves the object fully around the axis, creating a complete 3D shape.

4fill in blank

hard

Fill both blanks to correctly specify the axis start and end points for the revolve.

AutoCAD

Specify the axis start point as [1] and the axis end point as [2].

Drag options to blanks, or click blank then click option'

A0,0,0

B1,1,0

C0,0,1

D1,0,0

Attempts:

3 left

💡 Hint

Common Mistakes

Using points that are not aligned, causing an incorrect axis.

Swapping start and end points.

The axis is defined by two points. Starting at 0,0,0 and ending at 0,0,1 creates a vertical axis for revolving.

5fill in blank

hard

Fill all three blanks to create a revolve command that uses a 2D circle, revolves around the Z-axis, and completes a full 360 degrees.

AutoCAD

Select object: [1]
Specify axis start point: [2]
Specify angle of revolution: [3]

Drag options to blanks, or click blank then click option'

Acircle

B0,0,0

C360

Dline

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a line instead of a circle as the object.

Specifying an incomplete angle less than 360 degrees.

Using a circle as the object, starting the axis at 0,0,0, and revolving 360 degrees creates a full 3D solid of revolution.

Practice

1.

What does the REVOLVE command do in AutoCAD?

easy

A. It changes the color of a 2D shape.

B. It copies objects to multiple locations.

C. It creates a 3D object by spinning a 2D shape around an axis.

D. It flattens 3D objects into 2D drawings.

Solution

1. Step 1: Understand the purpose of REVOLVE

   The REVOLVE command spins a 2D shape around an axis to create a 3D object.

2. Step 2: Compare options

   "It creates a 3D object by spinning a 2D shape around an axis." is the only description that matches REVOLVE; others describe unrelated actions.

3. Final Answer:

   It creates a 3D object by spinning a 2D shape around an axis. -> Option C

4. Quick Check:

   REVOLVE = 3D spin [OK]

Hint: REVOLVE spins 2D shapes into 3D objects [OK]

Common Mistakes:

• Confusing REVOLVE with COPY command
• Thinking REVOLVE changes colors
• Assuming REVOLVE flattens objects

2.

Which of the following is the correct basic syntax to start the REVOLVE command in AutoCAD?

easy

A. Type REVOLVE3D and press Enter.

B. Type REVOLVE and press Enter.

C. Type REVOLV and press Enter.

D. Type REV and press Enter.

Solution

1. Step 1: Recall the exact command name

   The correct command to start revolve is REVOLVE.

2. Step 2: Check options for exact match

   Only "Type REVOLVE and press Enter." matches the exact command name; others are incorrect or incomplete.

3. Final Answer:

   Type REVOLVE and press Enter. -> Option B

4. Quick Check:

   Command name = REVOLVE [OK]

Hint: Type full command REVOLVE to avoid errors [OK]

Common Mistakes:

• Typing incomplete command names
• Adding extra characters to command
• Using abbreviations not recognized

3.

Given a 2D semicircle with radius 5 units, if you use the REVOLVE command to spin it 360 degrees around its straight edge, what 3D shape will you get?

medium

A. A sphere with radius 5 units.

B. A cylinder with height 5 units.

C. A cone with base radius 5 units.

D. A torus (donut shape).

Solution

1. Step 1: Understand the shape and axis

   Revolving a semicircle around its straight edge spins the curve fully, creating a sphere.

2. Step 2: Match shape to options

   A full revolution of a semicircle creates a sphere, not cylinder, cone, or torus.

3. Final Answer:

   A sphere with radius 5 units. -> Option A

4. Quick Check:

   Semicircle revolve 360° = Sphere [OK]

Hint: Revolve semicircle fully = sphere [OK]

Common Mistakes:

• Confusing cylinder with sphere
• Thinking partial revolve creates cone
• Assuming torus needs semicircle

4.

What is wrong with this use of the REVOLVE command?
REVOLVE a 2D line around an axis to create a 3D object.

medium

A. You must specify the angle as 180 degrees or less.

B. The axis must be a circle, not a line.

C. REVOLVE only works on closed 2D shapes.

D. A single line cannot be revolved to create a solid 3D object.

Solution

1. Step 1: Analyze the shape type

   A single 2D line has no area, so revolving it creates only a surface, not a solid.

2. Step 2: Check axis and angle requirements

   The axis can be any line; REVOLVE works on open or closed shapes; angle can be any value.

3. Final Answer:

   A single line cannot be revolved to create a solid 3D object. -> Option D

4. Quick Check:

   Line revolve ≠ solid [OK]

Hint: Revolve needs area, not just a line [OK]

Common Mistakes:

• Thinking axis must be circle
• Believing REVOLVE needs closed shapes only
• Assuming angle limit is 180 degrees

5.

You want to create a vase shape by revolving a 2D profile. The profile is an open curve with a base line and a curved outline. Which steps should you follow to get a smooth 3D vase using the REVOLVE command?

hard

A. Select the open profile, specify the base line as axis, and revolve 360 degrees.

B. Close the profile shape, select it, specify any axis, and revolve 180 degrees.

C. Select only the curved outline, specify the base line as axis, and revolve 90 degrees.

D. Use the base line as axis, revolve 360 degrees, then extrude the shape.

Solution

1. Step 1: Prepare the profile and axis

   Use the open profile including base line; base line is the axis for revolve.

2. Step 2: Apply revolve with full rotation

   Revolve 360 degrees around base line to create smooth vase shape.

3. Final Answer:

   Select the open profile, specify the base line as axis, and revolve 360 degrees. -> Option A

4. Quick Check:

   Open profile + base line axis + 360° revolve = vase [OK]

Hint: Revolve open profile 360° around base line for vase [OK]

Common Mistakes:

• Not using full 360 degrees revolve
• Revolving only curved outline without base line
• Trying to extrude after revolve unnecessarily