SWEEP and LOFT commands in AutoCAD - Cell-by-Cell Formula Trace

Sample Data

This data shows simple shapes used as profiles and paths for SWEEP and LOFT commands in AutoCAD, and the resulting 3D shapes.

Cell	Value
A1	Profile Curve
B1	Path Curve
C1	Sweep Result
D1	Loft Result
A2	Circle (radius 5)
B2	Line (length 20)
C2	Cylinder
D2	Smooth Surface
A3	Rectangle (4x2)
B3	Arc (90 degrees)
C3	Bent Tube
D3	Curved Surface

Formula Trace

SWEEP(Profile, Path) and LOFT(Profile1, Profile2)

Step 1: Select Profile Curve (e.g., Circle radius 5)

Step 2: Select Path Curve (e.g., Line length 20)

Step 3: Apply SWEEP(Profile, Path)

Step 4: Select Profile1 (e.g., Rectangle 4x2)

Step 5: Select Profile2 (e.g., Circle radius 3)

Step 6: Apply LOFT(Profile1, Profile2)

Cell Reference Map

   A           B           C           D
1 Profile    Path       Sweep      Loft
2 Circle(5) Line(20)   Cylinder   Smooth Surface
3 Rect(4x2) Arc(90°)  Bent Tube  Curved Surface

Profiles in column A and paths in column B are inputs. Columns C and D show the results of SWEEP and LOFT commands respectively.

Result

   A           B           C           D
1 Profile    Path       Sweep      Loft
2 Circle(5) Line(20)   Cylinder   Smooth Surface
3 Rect(4x2) Arc(90°)  Bent Tube  Curved Surface

The final shapes created by SWEEP and LOFT commands are shown in columns C and D, representing 3D objects formed from the profiles and paths.

Sheet Trace Quiz - 3 Questions

What does the SWEEP command do with the profile and path?

A Scales the profile to match the path length

B Connects two profiles with a smooth surface

C Moves the profile along the path to create a 3D shape

D Creates a 2D drawing from the profile

Key Result

SWEEP moves a profile along a path to create a 3D shape; LOFT creates a smooth 3D surface between two profiles.

Practice

1.

What is the main purpose of the SWEEP command in AutoCAD?

easy

A. To move a 2D shape along a path to create a 3D object

B. To blend multiple 3D shapes into a smooth surface

C. To rotate a 3D object around an axis

D. To create a flat 2D drawing from a 3D model

Solution

1. Step 1: Understand the SWEEP command function

   The SWEEP command takes a 2D shape and moves it along a path to form a 3D object.

2. Step 2: Compare with other options

   LOFT blends shapes, rotation and flat drawing are different commands.

3. Final Answer:

   To move a 2D shape along a path to create a 3D object -> Option A

4. Quick Check:

   SWEEP = Move shape along path [OK]

Hint: SWEEP = shape + path = 3D object [OK]

Common Mistakes:

• Confusing SWEEP with LOFT
• Thinking SWEEP rotates objects
• Assuming SWEEP creates flat drawings

2.

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

easy

A. Type LOFT3D and press Enter

B. Type SWEEP and press Enter

C. Type BLEND and press Enter

D. Type LOFT and press Enter

Solution

1. Step 1: Recall the command name for lofting

   The correct command to blend shapes is LOFT.

2. Step 2: Check other options

   SWEEP is different, LOFT3D and BLEND are not valid commands.

3. Final Answer:

   Type LOFT and press Enter -> Option D

4. Quick Check:

   LOFT command = LOFT [OK]

Hint: LOFT command is just 'LOFT' [OK]

Common Mistakes:

• Typing SWEEP instead of LOFT
• Adding extra characters to LOFT
• Using unrelated commands like BLEND

3.

Given a circle as a profile and a straight line as a path, what will the SWEEP command produce?

medium

A. A sphere at the start of the path

B. A flat circle on the path

C. A cylinder along the line path

D. A cone tapering along the path

Solution

1. Step 1: Understand the profile and path

   A circle profile swept along a straight line creates a cylinder shape.

2. Step 2: Eliminate other shapes

   A flat circle is 2D, sphere and cone require different profiles or commands.

3. Final Answer:

   A cylinder along the line path -> Option C

4. Quick Check:

   Circle + line path = cylinder [OK]

Hint: Circle + line path = cylinder [OK]

Common Mistakes:

• Thinking SWEEP creates flat shapes
• Confusing cylinder with sphere
• Assuming tapering without profile change

4.

What is the error in this sequence when using LOFT command: selecting only one 2D shape instead of multiple shapes?

medium

A. LOFT command will create a flat 2D shape

B. LOFT command will fail or show an error

C. LOFT will create a 3D object from one shape

D. LOFT will automatically duplicate the shape

Solution

1. Step 1: Understand LOFT requirements

   LOFT needs at least two shapes to blend between; one shape is insufficient.

2. Step 2: Predict command behavior

   With only one shape, LOFT will fail or show an error message.

3. Final Answer:

   LOFT command will fail or show an error -> Option B

4. Quick Check:

   LOFT needs multiple shapes [OK]

Hint: LOFT needs 2+ shapes to work [OK]

Common Mistakes:

• Assuming LOFT works with one shape
• Thinking LOFT creates flat shapes
• Believing LOFT duplicates shapes automatically

5.

You want to create a smooth 3D shape that transitions from a square at the bottom to a circle at the top. Which command and steps should you use?

hard

A. Use LOFT between the square and circle profiles

B. Use SWEEP with the square profile along a circular path

C. Use SWEEP with the circle profile along a square path

D. Use EXTRUDE on the square and then scale to circle

Solution

1. Step 1: Identify the shape transition needed

   The shape changes from square to circle, requiring blending between two profiles.

2. Step 2: Choose the correct command

   LOFT blends multiple shapes smoothly; SWEEP moves one shape along a path, EXTRUDE does not blend shapes.

3. Final Answer:

   Use LOFT between the square and circle profiles -> Option A

4. Quick Check:

   LOFT blends shapes = smooth transition [OK]

Hint: LOFT blends different shapes smoothly [OK]

Common Mistakes:

• Using SWEEP for shape blending
• Trying to extrude and scale for smooth blend
• Confusing path with profile roles