Extruded boss/base in Solidworks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an Extruded Boss/Base in SolidWorks?

An Extruded Boss/Base is a feature that creates a 3D shape by extending a 2D sketch straight out in one direction, like pushing dough to make a loaf.

beginner

Which sketch types can be used for an Extruded Boss/Base?

You can use closed 2D sketches like circles, rectangles, or polygons to create an Extruded Boss/Base. Open sketches won't create a solid shape.

beginner

What does the 'Direction 1' option control in an Extruded Boss/Base?

It controls how far and in which direction the sketch is pushed out to create the 3D shape.

intermediate

How can you make an Extruded Boss/Base go both ways from the sketch plane?

By selecting the 'Mid Plane' option, the extrusion extends equally in both directions from the sketch.

beginner

What is the difference between an Extruded Boss/Base and an Extruded Cut?

An Extruded Boss/Base adds material by pushing out a sketch, while an Extruded Cut removes material by pushing the sketch into the part.

What kind of sketch is needed to create an Extruded Boss/Base?

A 3D sketch

B Open 2D sketch

C Closed 2D sketch

D Text sketch

Only closed 2D sketches can create a solid extrusion.

Which option makes the extrusion extend equally in both directions?

A Mid Plane

B Through All

C Up to Surface

D Blind

Mid Plane extrudes the sketch equally on both sides.

What does an Extruded Boss/Base do?

A Removes material

B Adds material

C Changes color

D Creates a sketch

It adds material by pushing out the sketch.

If you want to cut a hole using a sketch, which feature do you use?

A Extruded Cut

B Revolve Boss/Base

C Extruded Boss/Base

D Fillet

Extruded Cut removes material using a sketch.

What controls the length of the extrusion?

A Material type

B Sketch size

C Color settings

D Direction 1 distance

Direction 1 distance sets how far the sketch is extruded.

Explain how you create a simple Extruded Boss/Base feature starting from a 2D sketch.

Think about pushing a flat shape into 3D.

Describe the difference between Extruded Boss/Base and Extruded Cut features in SolidWorks.

One builds up, the other carves out.

Practice

1. What does the Extruded Boss/Base feature do in SolidWorks?

easy

A. It turns a 2D sketch into a 3D solid by stretching it.

B. It creates a hole through a 3D part.

C. It colors the surface of a 3D model.

D. It flattens a 3D model into 2D.

Solution

1. Step 1: Understand the purpose of Extruded Boss/Base

   This feature takes a flat 2D sketch and extends it into the third dimension to create a solid shape.

2. Step 2: Compare options with the feature's function

   Only It turns a 2D sketch into a 3D solid by stretching it. describes turning a 2D sketch into a 3D solid by stretching, which matches the feature's purpose.

3. Final Answer:

   It turns a 2D sketch into a 3D solid by stretching it. -> Option A

4. Quick Check:

   Extruded Boss/Base = 2D to 3D solid [OK]

Hint: Extruded Boss/Base = stretch 2D sketch into 3D solid [OK]

Common Mistakes:

• Confusing extrusion with cutting or coloring
• Thinking it flattens 3D to 2D
• Assuming it creates holes

2. Which of the following is the correct syntax to start an Extruded Boss/Base in SolidWorks?

easy

A. Select a 3D solid and click 'Extruded Boss/Base' to flatten it.

B. Draw an open line and click 'Extruded Boss/Base' without selecting a sketch.

C. Click 'Extruded Boss/Base' first, then draw the sketch on the 3D model.

D. Select a closed 2D sketch, then click 'Extruded Boss/Base' and set the depth.

Solution

1. Step 1: Identify the correct workflow for Extruded Boss/Base

   You must first have a closed 2D sketch selected before applying the extrusion feature.

2. Step 2: Evaluate each option's correctness

   Select a closed 2D sketch, then click 'Extruded Boss/Base' and set the depth. correctly describes selecting a closed sketch and then applying the feature with a depth. Other options describe incorrect sequences or actions.

3. Final Answer:

   Select a closed 2D sketch, then click 'Extruded Boss/Base' and set the depth. -> Option D

4. Quick Check:

   Closed sketch + Extruded Boss/Base = correct syntax [OK]

Hint: Always select closed sketch before extrusion [OK]

Common Mistakes:

• Trying to extrude open sketches
• Starting extrusion before sketching
• Selecting 3D solids instead of sketches

3. Given a square sketch of 50mm side length, what will be the volume of the solid after applying an Extruded Boss/Base with a depth of 20mm?

medium

A. 1000 cubic mm

B. 50000 cubic mm

C. 2000 cubic mm

D. 500 cubic mm

Solution

1. Step 1: Calculate the area of the square sketch

   Area = side x side = 50mm x 50mm = 2500 mm².

2. Step 2: Calculate the volume by multiplying area by extrusion depth

   Volume = area x depth = 2500 mm² x 20 mm = 50000 cubic mm.

3. Final Answer:

   50000 cubic mm -> Option B

4. Quick Check:

   Volume = 50x50x20 = 50000 [OK]

Hint: Volume = sketch area x extrusion depth [OK]

Common Mistakes:

• Multiplying side length by depth only
• Using wrong units or forgetting to square
• Confusing area with volume

4. You tried to create an Extruded Boss/Base but got an error saying the sketch is not closed. What is the most likely cause?

medium

A. The sketch is fully defined.

B. The extrusion depth is set to zero.

C. The sketch contains gaps or open endpoints.

D. You selected a 3D solid instead of a sketch.

Solution

1. Step 1: Understand the error message about sketch closure

   Extruded Boss/Base requires a closed sketch; gaps or open endpoints cause errors.

2. Step 2: Analyze options for the cause

   The sketch contains gaps or open endpoints. correctly identifies open sketch geometry as the cause. Other options do not relate to the 'not closed' error.

3. Final Answer:

   The sketch contains gaps or open endpoints. -> Option C

4. Quick Check:

   Open sketch = extrusion error [OK]

Hint: Check sketch for gaps before extrusion [OK]

Common Mistakes:

• Ignoring open endpoints in sketches
• Assuming zero depth causes closure error
• Confusing sketch selection with extrusion depth

5. You have a circular sketch with radius 10mm. You want to create a hollow cylinder by extruding the circle and then cutting a smaller concentric circle of radius 7mm through the entire depth. Which sequence of features should you use?

hard

A. Extruded Boss/Base with outer circle, then Extruded Cut with inner circle through all.

B. Extruded Cut first, then Extruded Boss/Base on the same sketch.

C. Use only Extruded Boss/Base with both circles selected.

D. Create two separate Extruded Boss/Base features for each circle.

Solution

1. Step 1: Create the solid cylinder by extruding the outer circle

   Use Extruded Boss/Base on the larger circle to form the solid cylinder.

2. Step 2: Remove the inner material by cutting the smaller circle

   Use Extruded Cut on the smaller circle sketch to hollow out the cylinder through the entire depth.

3. Final Answer:

   Extruded Boss/Base with outer circle, then Extruded Cut with inner circle through all. -> Option A

4. Quick Check:

   Boss then Cut = hollow cylinder [OK]

Hint: Extrude solid first, then cut inner shape [OK]

Common Mistakes:

• Trying to cut before creating the solid
• Selecting both circles for one extrusion
• Creating two solids instead of hollow