3D solid editing (FILLET, CHAMFER edges) in AutoCAD - Cell-by-Cell Formula Trace

Sample Data

This data shows edges of a 3D solid and the editing operation applied: FILLET rounds edges with a radius, CHAMFER bevels edges with a distance.

Cell	Value
A1	Edge ID
B1	Operation
C1	Radius/Distance
D1	Result Description
A2	E1
B2	FILLET
C2	5
D2	Edge E1 rounded with radius 5
A3	E2
B3	CHAMFER
C3	3
D3	Edge E2 beveled with distance 3

Formula Trace

IF(B2="FILLET", CONCATENATE("Edge ", A2, " rounded with radius ", C2), IF(B2="CHAMFER", CONCATENATE("Edge ", A2, " beveled with distance ", C2), "No operation"))

Step 1: B2="FILLET"

Step 2: CONCATENATE("Edge ", A2, " rounded with radius ", C2)

Step 3: IF(B2="FILLET", ..., IF(B2="CHAMFER", ..., "No operation"))

Cell Reference Map

    A      B        C       D
1 |Edge ID|Operation|Radius/Dist|Result Desc
2 |  E1   | FILLET  |    5    |  ...
3 |  E2   | CHAMFER |    3    |  ...

Arrows: B2 and C2 feed into formula for row 2 result.

The formula uses cells A2, B2, and C2 to create the description in D2. It checks the operation type in B2 and uses the radius/distance in C2.

Result

    A      B        C       D
1 |Edge ID|Operation|Radius/Dist|Result Desc
2 |  E1   | FILLET  |    5    |Edge E1 rounded with radius 5
3 |  E2   | CHAMFER |    3    |Edge E2 beveled with distance 3

The result column D shows the text description of the 3D solid edge editing operation applied to each edge.

Sheet Trace Quiz - 3 Questions

What does the formula check first to decide the description?

A If the radius is greater than 5

B If the edge ID is E1

C If the operation is FILLET

D If the operation is CHAMFER

Key Result

IF operation type is FILLET or CHAMFER, concatenate edge ID with appropriate description and radius/distance value.

Practice

1. What does the FILLET command do in 3D solid editing?

easy

A. Cuts the edges at a straight angle to create a bevel

B. Rounds the edges with a smooth curve using a radius

C. Deletes the selected edges from the solid

D. Extends the edges to meet at a corner

Solution

1. Step 1: Understand the purpose of FILLET

   The FILLET command is used to create rounded edges by applying a radius to corners.

2. Step 2: Compare with other options

   Chamfer cuts edges at an angle, deletion removes edges, and extension lengthens edges, so these are incorrect.

3. Final Answer:

   Rounds the edges with a smooth curve using a radius -> Option B

4. Quick Check:

   FILLET = Rounded edges [OK]

Hint: FILLET = round edges with radius [OK]

Common Mistakes:

• Confusing FILLET with CHAMFER
• Thinking FILLET deletes edges
• Assuming FILLET extends edges

2. Which of the following is the correct syntax to apply a chamfer with distances 5 and 3 in AutoCAD 3D solid editing?

easy

A. CHAMFER D 5 3

B. CHAMFER DISTANCE 5 3

C. CHAMFER 5 3

D. CHAMFER 3 5

Solution

1. Step 1: Recall correct CHAMFER command syntax

   The correct syntax uses the letter D for distance followed by two distances, like CHAMFER D 5 3.

2. Step 2: Eliminate incorrect options

   Options B and C miss the 'D' keyword, and CHAMFER 3 5 reverses the distances.

3. Final Answer:

   CHAMFER D 5 3 -> Option A

4. Quick Check:

   CHAMFER D + distances = correct syntax [OK]

Hint: Use 'D' before distances in CHAMFER command [OK]

Common Mistakes:

• Omitting 'D' before distances
• Swapping distance values
• Using wrong keywords like DISTANCE

3. Given a 3D solid cube, what will be the result of applying FILLET EDGE 2 on all edges?

medium

A. All edges are cut at 2 units creating a bevel

B. The command causes an error due to missing parameters

C. Edges remain unchanged because FILLET EDGE requires two distances

D. All edges become rounded with radius 2

Solution

1. Step 1: Understand FILLET EDGE command

   FILLET EDGE with a single radius value rounds all selected edges with that radius.

2. Step 2: Check if parameters are sufficient

   FILLET EDGE 2 is valid and rounds edges; chamfer requires two distances, so no error occurs.

3. Final Answer:

   All edges become rounded with radius 2 -> Option D

4. Quick Check:

   FILLET EDGE + radius = rounded edges [OK]

Hint: FILLET EDGE with one number rounds edges [OK]

Common Mistakes:

• Confusing FILLET with CHAMFER parameters
• Assuming error due to missing second distance
• Thinking edges stay sharp

4. You tried to apply CHAMFER D 4 on a 3D solid edge but got an error. What is the likely cause?

medium

A. CHAMFER cannot be applied to 3D solids

B. The 'D' keyword is not valid in CHAMFER command

C. Only one distance was provided instead of two

D. Distance values must be equal for chamfer

Solution

1. Step 1: Check CHAMFER syntax requirements

   CHAMFER with distances requires two distance values after 'D', e.g., CHAMFER D 4 4.

2. Step 2: Identify error cause

   Providing only one distance causes syntax error because two distances define the chamfer lengths.

3. Final Answer:

   Only one distance was provided instead of two -> Option C

4. Quick Check:

   CHAMFER D needs two distances [OK]

Hint: CHAMFER D needs two distances, not one [OK]

Common Mistakes:

• Using only one distance value
• Thinking 'D' is invalid keyword
• Assuming chamfer can't apply to solids

5. You want to create a 3D solid box with all edges beveled at 1 unit horizontally and 2 units vertically. Which sequence of commands correctly achieves this?

hard

A. Create box -> Select edges -> CHAMFER D 1 2 -> Apply

B. Create box -> Select edges -> FILLET R 1 2 -> Apply

C. Create box -> Select edges -> CHAMFER 2 1 -> Apply

D. Create box -> Select edges -> FILLET EDGE 1 2 -> Apply

Solution

1. Step 1: Identify beveling command and parameters

   Beveling edges means chamfering, which requires two distances for horizontal and vertical cuts.

2. Step 2: Choose correct command syntax

   CHAMFER D 1 2 correctly applies chamfer with distances 1 and 2; FILLET rounds edges and does not take two distances.

3. Final Answer:

   Create box -> Select edges -> CHAMFER D 1 2 -> Apply -> Option A

4. Quick Check:

   Chamfer D + two distances = beveled edges [OK]

Hint: Use CHAMFER D with two distances for bevels [OK]

Common Mistakes:

• Using FILLET instead of CHAMFER for bevels
• Swapping distance order
• Omitting 'D' keyword in CHAMFER