Sketch trim and extend in Solidworks - Cell-by-Cell Formula Trace

Sample Data

Coordinates of two lines in a sketch before trim and extend operations. Line1 is horizontal from (0,0) to (5,0). Line2 is vertical from (3,-2) to (3,2).

Cell	Value
A1	Line1 Start
A2	(0,0)
B1	Line1 End
B2	(5,0)
A3	Line2 Start
A4	(3,-2)
B3	Line2 End
B4	(3,2)

Formula Trace

Trim(Line1, Line2) and Extend(Line2, Line1)

Step 1: Identify intersection point of Line1 and Line2

Step 2: Trim Line1 at intersection (3,0)

Step 3: Extend Line2 to meet trimmed Line1 at (3,0)

Cell Reference Map

    A       B
1 |Line1 Start|Line1 End  
2 |(0,0)      |(5,0)      
3 |Line2 Start|Line2 End  
4 |(3,-2)     |(3,2)      

Arrows:
Line1 from A2 to B2
Line2 from A4 to B4
Intersection at (3,0) between Line1 and Line2

Shows the coordinates of Line1 and Line2 used to find intersection and perform trim and extend.

Result

    A       B
1 |Line1 Start|Line1 End  
2 |(0,0)      |(3,0)      
3 |Line2 Start|Line2 End  
4 |(3,-2)     |(3,0)      

Trimmed Line1 ends at (3,0)
Extended Line2 ends at (3,0)

After trim and extend, Line1 ends at intersection (3,0) instead of (5,0), and Line2 ends at (3,0) instead of (3,2).

Sheet Trace Quiz - 3 Questions

Where is the intersection point of Line1 and Line2?

A (5,0)

B (3,0)

C (0,0)

D (3,2)

Key Result

Trim cuts a line at intersection point; Extend lengthens a line to meet another line at intersection.

Practice

1. What does the Trim tool do in SolidWorks sketching?

easy

A. Changes the color of sketch lines

B. Lengthens sketch lines to meet others

C. Creates new sketch lines

D. Removes unwanted parts of sketch lines

Solution

1. Step 1: Understand the purpose of Trim

   The Trim tool is used to cut away or remove parts of sketch lines that are not needed.

2. Step 2: Compare with other tools

   Unlike Extend, which lengthens lines, Trim only removes excess parts.

3. Final Answer:

   Removes unwanted parts of sketch lines -> Option D

4. Quick Check:

   Trim = Removes parts [OK]

Hint: Trim cuts lines; Extend lengthens lines [OK]

Common Mistakes:

• Confusing Trim with Extend
• Thinking Trim creates new lines
• Assuming Trim changes line color

2. Which of the following is the correct way to activate the Extend tool in SolidWorks sketch mode?

easy

A. Click the Trim icon and select Extend from the dropdown

B. Right-click on a line and choose Trim

C. Select the Extend tool directly from the Sketch toolbar

D. Use the Pull tool to lengthen lines

Solution

1. Step 1: Locate the Extend tool

   The Extend tool is found directly on the Sketch toolbar as its own icon.

2. Step 2: Understand toolbar usage

   Unlike Trim, which may have dropdown options, Extend is selected directly without dropdown.

3. Final Answer:

   Select the Extend tool directly from the Sketch toolbar -> Option C

4. Quick Check:

   Extend tool = Direct toolbar icon [OK]

Hint: Extend is a separate tool on the Sketch toolbar [OK]

Common Mistakes:

• Choosing Trim dropdown for Extend
• Right-clicking for Extend instead of toolbar
• Confusing Pull tool with Extend

3. Given two lines in a sketch that do not meet, what will happen if you use the Extend tool on the shorter line towards the longer line?

medium

A. The shorter line will lengthen until it meets the longer line

B. The longer line will shorten to meet the shorter line

C. Both lines will be trimmed to the midpoint

D. Nothing will change because Extend only works on arcs

Solution

1. Step 1: Identify the effect of Extend on lines

   Extend lengthens a selected line until it meets another sketch entity.

2. Step 2: Apply to the scenario

   The shorter line will grow until it touches the longer line, connecting them.

3. Final Answer:

   The shorter line will lengthen until it meets the longer line -> Option A

4. Quick Check:

   Extend lengthens line to meet another [OK]

Hint: Extend grows lines to meet others, never shortens [OK]

Common Mistakes:

• Thinking Extend shortens lines
• Believing Extend trims both lines
• Assuming Extend only works on arcs

4. You tried to use the Trim tool on a sketch line, but it did not remove the unwanted segment. What is the most likely reason?

medium

A. The line is fully constrained and cannot be trimmed

B. You used the Extend tool instead of Trim

C. The Trim tool only works on closed shapes

D. The segment is already trimmed and cannot be trimmed again

Solution

1. Step 1: Check tool selection

   If the Trim tool does not remove parts, it is possible the Extend tool was selected by mistake.

2. Step 2: Understand tool behavior

   Extend lengthens lines and does not remove segments, so no trimming occurs.

3. Final Answer:

   You used the Extend tool instead of Trim -> Option B

4. Quick Check:

   Wrong tool chosen = no trim effect [OK]

Hint: Confirm you selected Trim, not Extend [OK]

Common Mistakes:

• Confusing Trim and Extend tools
• Assuming constraints block trimming
• Thinking Trim only works on closed shapes

5. You have a sketch with multiple overlapping lines. You want to clean it by removing the extra parts and then connect some lines by lengthening them. Which sequence of actions is correct?

hard

A. Use Trim to remove extra parts, then Extend to lengthen lines to meet

B. First use Extend to lengthen lines, then Trim to remove extras

C. Use Extend only, as it also removes extra parts

D. Use Trim only, as it also lengthens lines

Solution

1. Step 1: Remove extra parts first with Trim

   Trim cleans the sketch by cutting unwanted line segments, making the sketch neat.

2. Step 2: Connect lines by lengthening with Extend

   After trimming, Extend lengthens lines to meet others, completing connections.

3. Final Answer:

   Use Trim to remove extra parts, then Extend to lengthen lines to meet -> Option A

4. Quick Check:

   Trim then Extend = Clean and connect [OK]

Hint: Trim first to clean, then Extend to connect lines [OK]

Common Mistakes:

• Extending before trimming causes messy sketches
• Thinking Extend removes extra parts
• Assuming Trim lengthens lines