Draft angle feature in Solidworks - Step-by-Step Guide

Introduction

The draft angle feature in SolidWorks helps you add a slight angle to faces of a 3D model. This makes it easier to remove parts from molds in manufacturing. It solves the problem of parts sticking in molds by creating tapered surfaces.

When designing plastic parts that will be molded and need to release easily from the mold

When creating metal castings that require tapered sides for easy removal

When adding a slight angle to vertical faces to improve the look or function of a part

When preparing a model for manufacturing processes that need draft angles

When adjusting existing parts to meet manufacturing requirements without redesigning

Steps

Step 1: Open the part file

- SolidWorks main window

The 3D model appears on the screen

Step 2: Click

- Features tab > Draft tool

Draft PropertyManager opens on the left side

Step 3: Select

- Faces to draft in the graphics area

Selected faces highlight in yellow

Step 4: Choose

- Neutral plane or face in the Draft PropertyManager

Neutral plane highlights and draft direction sets

Step 5: Enter

- Draft angle input box

Faces preview shows the angled draft applied

Step 6: Click

- OK button in Draft PropertyManager

Draft angle feature is added to the model

Before vs After

Before

The vertical faces of the part are straight with no angle

After

The selected faces have a 5-degree angle taper away from the neutral plane

Settings Reference

Draft angle

📍 Draft PropertyManager > Angle input box

Sets how much the face will be angled from the neutral plane

Default: 0 degrees

Neutral plane

📍 Draft PropertyManager > Neutral plane selector

Defines the base face or plane from which the draft angle is measured

Default: None

Faces to draft

📍 Draft PropertyManager > Faces selection box

Specifies which faces will receive the draft angle

Default: None

Common Mistakes

Selecting the wrong neutral plane

The draft angle will be applied in the wrong direction, causing manufacturing issues

Always select the face or plane that represents the base or mold opening direction

Entering a zero or very small draft angle

No effective draft is created, so parts may stick in molds

Use a draft angle of at least 1-2 degrees depending on the material and process

Summary

The draft angle feature adds a tapered angle to faces for easier mold release.

You must select the correct neutral plane to control draft direction.

Set a meaningful draft angle to ensure manufacturability.

Practice

1. What is the main purpose of the Draft angle feature in SolidWorks?

easy

A. To add a taper to faces for easier mold release

B. To create holes in a part

C. To change the color of a model

D. To measure the dimensions of a part

Solution

1. Step 1: Understand the draft angle feature function

   The draft angle feature is used to add a taper to faces of a part.

2. Step 2: Connect taper to manufacturing ease

   This taper helps in releasing the part from molds without damage.

3. Final Answer:

   To add a taper to faces for easier mold release -> Option A

4. Quick Check:

   Draft angle = taper for mold release [OK]

Hint: Draft angle = taper for easy mold removal [OK]

Common Mistakes:

• Confusing draft angle with hole creation
• Thinking it changes color or measures parts
• Ignoring its role in manufacturing

2. Which of the following is the correct syntax to apply a draft angle in SolidWorks?

easy

A. Select edge > Extrude > Set angle > Apply

B. Select face > Insert > Draft > Set angle > Apply

C. Right-click face > Delete > Set angle > Confirm

D. Select face > Color > Set angle > Apply

Solution

1. Step 1: Identify correct draft angle workflow

   Draft angle is applied by selecting a face, then using Insert > Draft.

2. Step 2: Confirm correct steps and options

   Set the desired angle and apply the feature to add taper.

3. Final Answer:

   Select face > Insert > Draft > Set angle > Apply -> Option B

4. Quick Check:

   Correct draft syntax = Insert > Draft [OK]

Hint: Use Insert > Draft to apply draft angle [OK]

Common Mistakes:

• Confusing draft with delete or extrude commands
• Trying to set angle in color options
• Skipping the Insert menu step

3. Given a part with a neutral plane selected and a draft angle of 5°, what will happen to the selected face after applying the draft feature?

medium

A. The face will taper outward by 5° from the neutral plane

B. The face will move parallel without angle change

C. The face will rotate 5° around the neutral plane

D. The face will be deleted

Solution

1. Step 1: Understand neutral plane role

   The neutral plane is the reference from which the draft angle is measured.

2. Step 2: Apply draft angle effect

   The selected face will taper outward or inward by the specified angle from this plane.

3. Final Answer:

   The face will taper outward by 5° from the neutral plane -> Option A

4. Quick Check:

   Draft angle causes taper from neutral plane [OK]

Hint: Draft angle tapers face from neutral plane [OK]

Common Mistakes:

• Thinking face moves parallel without taper
• Confusing taper with rotation
• Assuming face is deleted

4. You applied a draft angle but the face did not taper as expected. Which of the following is the most likely error?

medium

A. Face was hidden before applying draft

B. Neutral plane was not selected correctly

C. Draft angle was set to zero degrees

D. Model color was changed instead of draft

Solution

1. Step 1: Check draft angle value

   If the draft angle is zero, no taper will be applied.

2. Step 2: Confirm effect of zero angle

   Zero degrees means the face remains unchanged, causing no visible taper.

3. Final Answer:

   Draft angle was set to zero degrees -> Option C

4. Quick Check:

   Zero angle = no taper [OK]

Hint: Zero angle means no taper applied [OK]

Common Mistakes:

• Ignoring draft angle value
• Assuming hidden face blocks draft
• Confusing color change with draft effect

5. You need to design a plastic part that must release easily from its mold. Which draft angle strategy should you apply in SolidWorks to ensure minimal sticking and damage?

hard

A. Apply draft angle only on non-mold faces

B. Apply a large negative draft angle to speed up molding

C. Do not apply any draft angle to keep faces flat

D. Apply a small positive draft angle from the neutral plane on all mold faces

Solution

1. Step 1: Understand mold release requirements

   Small positive draft angles help parts release easily without damage.

2. Step 2: Avoid negative or no draft angles

   Negative or zero draft angles cause sticking or damage during mold release.

3. Step 3: Apply draft on all mold faces

   Applying draft on all relevant faces ensures smooth manufacturing.

4. Final Answer:

   Apply a small positive draft angle from the neutral plane on all mold faces -> Option D

5. Quick Check:

   Small positive draft = easy mold release [OK]

Hint: Use small positive draft on all mold faces [OK]

Common Mistakes:

• Using negative draft angles causing sticking
• Skipping draft angles leading to damage
• Applying draft only on irrelevant faces