UTPA STEM/CBI Courses/Graphics/A Lesson in Sub-Assemblies & Working Drawings - CAD - Lincoln Log House

Course Title: Engineering Graphics

Lecture Topic: A Lesson in Sub-Assemblies & Working Drawings – CAD – Lincoln Log House

Instructor: Gregory Potter

Institution: UTPA

To visit the Engineering Graphics website click here

Example of Lincoln Log House

Backwards Design

Course Objectives

• Primary Objectives- By the next class period students will be able to:
  • Create a library of parts to use in creation of an overall assembly
  • Use sub-assemblies to organize their CAD models
  • Create a set of working drawings

• Sub Objectives- The objectives will require that students be able to:
  • Render their designs in order to display their designs in the best light

• Difficulties- Students may have difficulty:
  • Organizing their sub-assemblies
  • Creating smart mates

• Real-World Contexts- There are many ways that students can use this material in the real-world, such as:
  • Creating a library of parts (e.g.-standard parts from any given manufacturing company)
  • Creating a unique design from standard parts
  • Creating sets of professional working drawings

Model of Knowledge

• Concept Map
  • Students can use the skills from this lesson to organize and assemble virtually any real world design.

• Content Priorities
  • Enduring Understanding
    • Students must understand how assembly instructions help the assembly process
    • Students must be able to create a set of working drawings
  • Important to Do and Know
    • smart mates
    • rendering techniques
    • advanced drawing techniques
  • Worth Being Familiar with
    • texturing
    • file/model organization

Assessment of Learning

• Formative Assessment
  • In Class (groups)
    • Examples by instructor during lab
    • Tutorial movie on website
  • Homework (individual)
    • Design a unique Lincoln Log House
    • Show this design in a complete set of working drawings

• Summative Assessment
  • The Final Project will require the skills learned during this lesson.

Legacy Cycle

OBJECTIVE

By the next class period, students will be able to:

• Create a library of standard parts
• Create a unique design using a library of parts
• Generate a complete set of working drawings

The objectives will require that students be able to:

• Render their design
• Organize their sub-assemblies
• Use advanced drawing an assembly techniques

THE CHALLENGE

The students are required to design a Lincoln Log Fortification. They are required to generate a complete set of working drawings to manufacture and assemble their design.

GENERATE IDEAS

Lincoln Log Parts

Give the students dimensions of Lincoln Logs and accessories so that they are able create part files in SolidWorks. From this, they can create an assembly of a Lincoln Log House.

Example of Assembly Drawing

Example of Sub-Assembly Drawing

MULTIPLE PERSPECTIVES

Ask students to create rough sketches of their Log House first, and then create the assembly using their Lincoln Log parts drawn earlier. Students are encouraged to play with the Lincoln Logs brought to the lab. Students can see how the pieces fit together in the real world before attempting to create a solid model assembly.

• What holds the Lincoln Log House together? Why doesn’t it fall down under its own weight? These questions are designed to help students how the parts must be assembled using CAD software. By understanding the real life relationships between parts, one can assemble a more accurate model.
• What kind of smart mates could be employed when assembling your log fortress? Students can use the “smart mates” lesson to increase their efficiency on this project. This would allow them to try out many ideas without wasting too much time.
• How would you simulate the appearance of the wooden logs, chimney, and roof components? The use of textures to render parts with realistic surfaces and shadows is part of this lesson as well.

RESEARCH & REVISE

Students are required to create a unique design in the form of a battlement. The students are encouraged to do research online for design ideas for defensive structures. And the students may simply play around using the CAD software to explore different design ideas. With unlimited pieces, there are no limits on size. However, the students are required to create working drawings showing the dimensions of each part and all of the assembly steps to build their battlement. Available on the EG website is a tutorial movie to instruct the students what is required for this assignment. They are shown an example, but not step by step instructions.

TEST YOUR METTLE

Students will be required to complete their original design as part of their homework assignment. An example is given in the form of tutorial movies showing the necessary information to draw each piece. Each student will produce a complete set of working drawings for their design including dimensioned parts drawings and assembly instructions with a bill of materials (BOM).

GO PUBLIC

The students are assigned a final project at the end of the semester. They will be required to use the skills acquired during this lesson.

Pre-Lesson Quiz

Show the students an example of a Lincoln Log House. Proceed to show them a complete set of working drawings including parts and assembly drawings. Discuss the possible difficulties involved with such a task.

Test Your Mettle Quiz

Students are required to design a unique Lincoln Log House and generate a complete set of working drawings. Students will also use the skills learned during this lesson to complete the Final Project at the end of the semester.