Computer-Aided Design

Overview

Framework:
RQF
Level:
Level 2
Unit No:
T/618/3670
Credits:
6
Guided learning hours:
48 hours

Aim

Learners will develop skills using CAD software to produce 2D and 3D drawings. They will learn about national and international standards to ensure that drawings produced will be clearly understood. They will also explore some of the more advanced features of the software, to ensure that drawings comply with standard working practices.

Unit Learning Outcomes

1

Understand CAD Software.

  • Configurable drawing parameters: drawing templates, sheet sizes, drawing lines, limits and types, scales, text and dimension styles, screen display, layers, units, toolbars, drawing origin and datum, peripheral devices.
  • Benefits: productivity and speed of drawing creation, uniformity of production, standardised parts, symbols etc., electronic data exchange and transfer, computer aided manufacture (CAM).
  • Limitations: time taking process to know how to operate CAD software, high production costs (time and cost of training staff, software costs), files can get corrupted.

Assessment Criteria

  • 1.1

    Describe the types of CAD drawing parameters that can be configured to meet drawing requirements.

  • 1.2

    Explain the benefits and limitations of using CAD software to create drawings.

2

Understand the need to comply with national and international drawing standards.

  • Importance: standard requirement, commonality of drawing interpretation, removal of language barriers (use of symbology), global manufacture of component parts assembled in one location.
  • Features and symbols: use of 1st and 3rd angle projection, features used in drawings (symbols, lettering and numbering, line types, dimensioning), units of measurement (metric, imperial, angular), symbols utilised in engineering drawings (welding, electrical/electronic, mechanical, fluid power).

Assessment Criteria

  • 2.1

    Explain the importance of national and international drawing standards.

3

Be able to produce 2D and 3D drawings to industry standards.

Drawings of component parts that form an assembly drawing to BS8888, showing use of:

  • Basic drawing commands and editing commands to produce and erase lines, circles, text.
  • Outputting to a printer/plotter device
  • Appropriate tools to allow accurate geometry definition
  • Manipulation of views, including zoom and pan options
  • Saving the drawing data in an appropriate format
  • Modification and manipulation of drawn features, including scaling, revolving/rotating, copying/duplicating and moving.
  • Dimensioning and hatching.
  • Drawing template, typically to include a border, title block, projection, scale, drawing number, title of drawing, material, names of drawing creator and who checks/authorises the drawing.
  • Further CAD commands, including erase, stretch, trim, scale; absolute, relative and polar coordinates, features, (type of line, grid, snap,circle, text, hatch, zoom-in, zoom out)

3D CAD model using a 2D CAD assembly drawing showing use of: configuration of the parametric modeller, including origin, units, snap and grid, correct format, project files, selection of planes, e.g. XY, XZ and YZ, use of display commands, including pan, zoom, and orbit.

Assessment Criteria

  • 3.1

    Produce a 2D CAD assembly drawing from parts drawings.

  • 3.2

    Produce fully dimensioned 2D CAD parts drawings using basic and further CAD commands and BS standards.

  • 3.3

    Produce a 3D CAD model from a 2D CAD assembly drawing.