CAD

Specific Competencies and Skills Tested in this Assessment:

Computer Systems and File Management

• Hardware and operating systems
• File management and sharing

 

Print Reading

• Interpret views in engineering drawings
• Interpret bilateral, unilateral, and limit dimensions
• Interpret drawings, pictures, and drafting symbols
• Interpret GD&T symbols
• Interpret hole dimensioning

 

Measuring

• Identify proper measurement principles
• Interpret micrometer measurements

 

Drawing Creation

• Determine and create appropriate drawing views and scales
• Organize required drawings and sheet coordination
• Insert and modify appropriate dimensions into drawings
• Create, insert, and modify notes and labels into drawings
• Create or insert symbols into drawings with legends
• Construct and modify drawing geometries
• Assign and coordinate line types and levels
• Construct and modify block geometries
• Construct and detail an assembly view
• Identify key components in a title block
• Locate points using the Cartesian Coordinate System
• Create single and multiple auxiliary views of surfaces and objects
• Construct schedules (e.g., Bill of Materials, parts list)

 

Creating Parameters

• Set up text and fonts
• Create and modify dimension styles
• Differentiate plot styles and scales
• Identify and interpret industry standards related to engineering drawings (e.g., ISO, ANSI, JIS)

 

Drawing Views

• Identify various types of pictorial views
• Select and manipulate the correct orthographic views
• Identify and interpret various section views
• Define and apply auxiliary views
• Summarize the applications of rendered views
• Describe the application of detail views
• Organize and generate exploded assemblies

 

3-D Modeling

• Generate and modify construction entities (e.g., planes, axis, points)
• Create and detail 2-D drawings from a 3-D model
• Create and modify a feature geometry-based 3-D model
• Create and constrain 3-D assemblies
• Create, modify, and apply material properties (e.g., types, volume, mass)
• Importation and application of standard parts to 3-D assemblies
• Produce alternative output (e.g., rapid prototype, CNC)

Written Assessment: 

Administration Time: 3 hours   

Number of Questions: 160

 

Areas Covered:

Computer Systems and File Management: 4%

Print Reading: 15%

Measuring: 4%

Drawing Creation: 31%

Creating Parameters: 9%

Drawing Views: 16%

3-D Modeling: 21%

Sample Questions: 

Equipment and devices in a Computer Aided Drafting system are known as

1. Software
2. hardware
3. modules
4. systems

 

Unlike other types of section views, _____ sections show hidden lines if they exist.

1. full
2. offset
3. enlarged
4. half

 

A drawing scale of half size should be labeled

1. 1:0
2. 1:2
3. 2:1
4. 4:2

 

When using GD&T, positional tolerances should refer to a 

1. centerline
2. datum
3. object
4. coordinate

 

To accurately measure the depth of a .5 diameter hole, use a/an

1. steel rule 
2. slide caliper 
3. inside caliper 
4. OD micrometer

Performance Assessment:

Administration Time: 2 hours   

Number of Jobs: 3

 

Areas Covered:

36% Create a 2-D Orthographic Drawing with a Section View

Participants will print and plot to scale, write the correct title block, draw the hatch, views, dimensions and placement correctly, and save the file

 

26% Create a 3-D Solid Model

Participants will build correct radius corners and holes with the correct mass properties and save the file.

 

38% Create Two Parts to be Mated and Mate the Parts

Participants will create two parts with the correct feature geometry and volume properties and mate the two parts and save the file.

Sample Job:

Create Two Parts to be Mated and Mate the Parts 

Maximum Time:   1 hour 

Participant Activity:  The participant, using the CAD system provided, will create complete 3-D solid models of the parts as shown, determine and print out the volume of Part A and Part B, mate Part A and Part B, and save the complete job to CD or equivalent storage media with the file name.