Part 1

Module 2: Checking the Accuracy of Models

Learning Outcomes

When you have completed this module, you will be able to:

  1. Describe how the models drawn in lab exercises are checked for accuracy.

Checking the Accuracy of Models

It is extremely important in AutoCAD to draw with 100% accuracy. This cannot be stressed enough as it is essential that each model be positioned and sized perfectly. Models constructed in the lab exercises, in the AutoCAD 3D book, can be checked for accuracy by overlaying it with a key. As a beginner, this helps you know that the models are drawn accurately and shows you any part of the model that is drawn incorrectly. As you become more experienced, you will not require keys to check your models.

WORK ALONG: Checking the Accuracy of Models

Step 1

Using the NEW command, start a new drawing using the template: 3D Layout English.

Step 2

Save and name the drawing: AutoCAD 3D Lab 02-1.

Step 3

Check to ensure that the Model tab is enabled. If it is not, enable it by clicking it with the left mouse button. (Figure Step 3)

Figure Step 3

Step 4

Ensure that all features on the Status bar are disable by clicking any that are enabled. Your Status bar should match the figure. (Figure Step 4)

Figure Step 4

Step 5

Ensure that ByLayer is enabled in the first 3 boxes on the Properties menu. (Figure Step 5)

Properties Toolbar
Home Ribbon

Step 6

Click Format on the Pull-down menu and click Units to open the Drawing Units dialogue box. (Figure Step 6A and 6B)

Figure Step 6A
Format Pull-down
Figure Step 6B

Step 7

Pull down the Insertion scale list and select Inches. Click OK to close the Drawing Units dialogue box. (Figure Step 7)

Figure Step 7

Step 8

Click the Insert pull-down and select Block. This will open the Insert dialogue box. (Figure Step 8)

Figure Step 8

Step 9

Click the small triangle at the end of the Name box. It will pull-down the list of the block names contained in the drawing file. (Figure Step 9)

Figure Step 9

Step 10

Click the block: AutoCAD 3D Lab 02-1. It will highlight as shown in the figure. The name you select is always the name of the drawing for the lab exercise you are working on. (Figure Step 10)

Figure Step 10

Step 11

Ensure that the three Specify On-screen boxes are disabled. (Figure Step 11A and 11B)

Figure Step 11A
Figure Step 11B

Step 12

Click the OK button.

Step 13

This will insert a magenta colored overlay key on your model. If there double objects or places where the users model and the magenta model don’t match, the users model is incorrect. If only one model displays, even though it may share the colors magenta and red, the model is accurate. The magenta key resides on layer: Key. If the model is incorrect, turn layer: Key off and correct the model before going on to the next lab exercise or module. After your model is corrected, check it again by turning layer: Key on. (Figure Step 13)

Figure Step 13
AUTHOR’S COMMENTS: This is just a demo, therefore, you are only learning the process. You will be checking your first model for accuracy in Module 3.

Step 14

Save and close the drawing.

Key Principles

Key Principles in Module 2

  1. AutoCAD models must be drawn with 100% accuracy.
  2. Most models that you will be drawing in the lab exercises in the AutoCAD 3D book can be checked for accuracy using an overlay key.
  3. The name of the key that you select to check your model is always the name of the drawing for the lab exercise for that model.
  4. After the key is inserted and only one model displays, the model is 100% accurate.


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Introduction to Drafting and AutoCAD 3D by Wally Baumback is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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