Unit 4: Design

Lesson 3: Criteria and ConstraintsFile 4.3.2: Toy Train Design Brief

Challenge: Design and model, using hand drawings, or google sketch up, pieces for a toy train track, which allow for a model train, described below, to travel in a closed loop.Procedures:1. Using drafting software (e.g., TinkerCAD) or by hand, design a track for a toy train.2. The end product must conform to the following design criteria:

A. The track will be thermoformed on a 61 cm by 91 cm sheet of plastic that is 3.25 mm thick.

B. To reduce waste as much of the plastic as possible should be used. The track should include enough sections that, when assembled, there will be a closed loop with no extra pieces.

Figure D502.03.01Example Track

C. For cost reduction, there should only be two types of sections: one circular and one linear. The sections can be any size in length or width.

D. The model train that will run on these tracks has a total axel and wheel width of 50 mm; Therefore, the design must have a raised indenture uniformly around the entire track that is 50 mm wide (refer to drawing Figure D502.03.001).

©2012 International Technology and Engineering Educators Association Foundations of Technology, Third Edition/

Technology, Engineering, and Design

1

Figure D502.03.02 Example Track Section

E. The raised indenture should be .50 mm total width (refer to drawing Figure D502.03.02).

F. The drawing must show that the thickness, including raised and recessed areas, is uniform 1.25 mm.

G. Complete an initial pattern layout. Each piece should have at least 2mm in between one another on the layout for mold and shearing purposes.

Figure D502.03.03 Example Pattern Layout

H. When the layout is complete and all sizes are final, model a linear and circular section with the drafting software provided.

Figure D502.03.04Example Rendering of Track Sections

©2012 International Technology and Engineering Educators Association Foundations of Technology, Third Edition/

Technology, Engineering, and Design

2

I. Create an assembly showing how each piece will connect in a complete loop.

Figure D502.03.05 Example of Assembly in a Complete Loop

J. From the models, create additional drawings. Include a multiview of each type of track section with complete dimensioning and a final pattern layout (refer to Figure D502.03.06).

Figure D502.03.06Example of Final Pattern Layout

4. Place the multiviews on sheets of appropriate size. Add your name, part name, and date in a title block.

5. Print a Final Pattern Layout, an Assembly of the Complete Loop, and the multiviews of a linear section and a circular section. There will be four drawings in the final product.

6. Time Limit = 270 minutes (3 Class Periods)7. Your work should reflect an understanding of design concepts and principles and the

relevance of drafting standards to problem solving applications.

©2012 International Technology and Engineering Educators Association Foundations of Technology, Third Edition/

Technology, Engineering, and Design

3