ARRAY (rectangular and polar) in AutoCAD - Real Business Scenario

Scenario Mode

👤 Your Role: You are a CAD technician at a manufacturing company.

📋 Request: Your manager wants you to create a drawing showing multiple copies of a part arranged in both rectangular and polar patterns to visualize the layout for production.

📊 Data: You have a single part drawing and need to create arrays: one rectangular array with 3 rows and 4 columns spaced evenly, and one polar array with 6 copies arranged in a circle around a center point.

🎯 Deliverable: A CAD drawing with the part duplicated in a rectangular array and a polar array, clearly labeled and dimensioned.

Sample Data

Part	Width (mm)	Height (mm)
Bracket	50	30

1

Step 1: Open the part drawing in AutoCAD.

N/A

Expected Result

The single part drawing is open and ready for editing.

2

Step 2: Create a rectangular array of the part with 3 rows and 4 columns. Set the row spacing to 60 mm and column spacing to 70 mm.

Use the ARRAYRECT command, select the part, enter 4 for columns, 3 for rows, column spacing 70, row spacing 60.

Expected Result

The part is duplicated in a grid with 4 columns and 3 rows spaced 70 mm horizontally and 60 mm vertically.

3

Step 3: Create a polar array of the part with 6 copies arranged evenly in a circle of radius 100 mm around a chosen center point.

Use the ARRAYPOLAR command, select the part, specify center point, enter 6 for number of items, set radius to 100 mm.

Expected Result

The part is duplicated 6 times evenly spaced in a circle with 100 mm radius.

4

Step 4: Label the rectangular and polar arrays clearly using text annotations.

Use the TEXT command to add labels 'Rectangular Array' and 'Polar Array' near each array.

Expected Result

Both arrays are clearly labeled for easy identification.

5

Step 5: Add dimension lines to show the spacing between parts in the rectangular array and the radius of the polar array.

Use the DIMLINEAR command for rectangular spacing and DIMRADIUS for polar array radius.

Expected Result

Dimensions clearly show 70 mm and 60 mm spacing in rectangular array and 100 mm radius for polar array.

Final Result

 +-----------------------------+       (Polar Array)
 |  Part  Part  Part  Part      |       O O O O O O
 |  Part  Part  Part  Part      |        \|/|/|/|/|
 |  Part  Part  Part  Part      |       (Rectangular Array)
 +-----------------------------+

Labels:
- Rectangular Array
- Polar Array

Dimensions:
- 70 mm horizontal spacing
- 60 mm vertical spacing
- 100 mm radius circle

✓Rectangular array helps visualize parts arranged in rows and columns for efficient space use.

✓Polar array shows parts arranged in a circular pattern, useful for round assemblies.

✓Dimensioning confirms correct spacing and radius for manufacturing layout.

Bonus Challenge

Create a combined array where the rectangular array is duplicated in a polar pattern, resulting in multiple rectangular grids arranged in a circle.

Show Hint

First create the rectangular array, then use the polar array command on the entire rectangular array group.

Practice

1. What does the ARRAYRECT command do in AutoCAD?

easy

A. Deletes selected objects from the drawing.

B. Arranges objects in a circular pattern.

C. Creates rows and columns of copies of selected objects.

D. Scales objects uniformly.

Solution

1. Step 1: Understand the purpose of ARRAYRECT

   The ARRAYRECT command is used to create a rectangular array, which means making copies of objects arranged in rows and columns.

2. Step 2: Compare with other array types

   ARRAYPOLAR arranges objects in a circle, so it is not the correct answer here.

3. Final Answer:

   Creates rows and columns of copies of selected objects. -> Option C

4. Quick Check:

   ARRAYRECT = Rows and columns [OK]

Hint: RECT = Rows and Columns layout [OK]

Common Mistakes:

• Confusing ARRAYRECT with ARRAYPOLAR
• Thinking ARRAYRECT deletes objects
• Assuming ARRAYRECT scales objects

2. Which of the following is the correct syntax to create a polar array of 6 items in AutoCAD?

easy

A. ARRAYPOLAR 6

B. ARRAYPOLAR OBJECT 6

C. ARRAYPOLAR OBJECTS 6

D. ARRAYPOLAR 360 6

Solution

1. Step 1: Recall basic ARRAYPOLAR syntax

   The basic command to create a polar array with a specified number of items is ARRAYPOLAR 6, where 6 is the number of copies.

2. Step 2: Identify incorrect syntax

   Syntax with unnecessary words like OBJECT or OBJECTS is invalid. ARRAYPOLAR 360 6 adds 360 which is not required in this simple syntax.

3. Final Answer:

   <code>ARRAYPOLAR 6</code> -> Option A

4. Quick Check:

   ARRAYPOLAR + number = correct syntax [OK]

Hint: ARRAYPOLAR + number of items is enough [OK]

Common Mistakes:

• Adding extra words like OBJECT or OBJECTS
• Including angles unnecessarily
• Using wrong command names

3. Given a rectangular array with 3 rows and 4 columns, how many total copies of the object will be created (including the original)?

medium

A. 15

B. 7

C. 11

D. 12

Solution

1. Step 1: Calculate total items in rectangular array

   A rectangular array with 3 rows and 4 columns creates 3 x 4 = 12 total items.

2. Step 2: Include the original object

   The original object is included in the count, so total copies including original is 12.

3. Final Answer:

   12 -> Option D

4. Quick Check:

   3 rows x 4 columns = 12 [OK]

Hint: Multiply rows by columns for total items [OK]

Common Mistakes:

• Subtracting 1 for original object
• Adding rows and columns instead of multiplying
• Confusing rows with columns

4. You tried to create a polar array but the copies overlap at the center. What is the most likely cause?

medium

A. The angle between items is set to 0 degrees.

B. The number of items is too high.

C. The base point is outside the circle.

D. The original object is too large.

Solution

1. Step 1: Understand polar array spacing

   In a polar array, copies are spaced evenly around a circle by an angle. If the angle is 0 degrees, all copies overlap at the center.

2. Step 2: Analyze other options

   Too many items or large objects may cause crowding but not exact overlap. Base point outside circle affects placement but not overlap at center.

3. Final Answer:

   The angle between items is set to 0 degrees. -> Option A

4. Quick Check:

   Angle 0° causes overlap [OK]

Hint: Check angle between items is not zero [OK]

Common Mistakes:

• Ignoring angle setting
• Blaming object size only
• Misunderstanding base point role

5. You want to create a polar array of 8 copies evenly spaced around a circle of radius 10 units. Which steps correctly describe how to do this in AutoCAD?

hard

A. Select object, use ARRAYRECT, specify 4 rows, 2 columns, set spacing 5 units.

B. Select object, use ARRAYPOLAR, specify center point, enter 8 items, set radius 10 units.

C. Select object, use ARRAYPOLAR, specify center point, enter 10 items, set radius 8 units.

D. Select object, use ARRAYRECT, specify 8 rows, 1 column, set spacing 10 units.

Solution

1. Step 1: Choose correct array type for circular pattern

   To arrange copies evenly around a circle, use ARRAYPOLAR, not ARRAYRECT.

2. Step 2: Specify parameters correctly

   Specify the center point of the circle, number of items (8), and radius (10 units) to place copies evenly.

3. Final Answer:

   Select object, use ARRAYPOLAR, specify center point, enter 8 items, set radius 10 units. -> Option B

4. Quick Check:

   Polar array + correct items + radius = Select object, use ARRAYPOLAR, specify center point, enter 8 items, set radius 10 units. [OK]

Hint: Use ARRAYPOLAR with center, items, and radius [OK]

Common Mistakes:

• Using ARRAYRECT for circular pattern
• Mixing number of items and radius values
• Incorrect rows and columns for polar array