Feb 26 – Mar 3
Unit Summary Students will create engineering working drawings that document measurements collected during the reverse engineering process completed in the previous unit. Students will also effectively document a proposed new design.
Big Ideas
CAD software packages facilitate virtual modeling of assemblies and the creation of technical drawings. They are used to efficiently and accurately detail assemblies according to standard engineering practice.
A degree of variation always exists between specified dimensions and the measurement of a manufactured object which is controlled by the use of tolerances on technical drawings.
A problem and the requirements for a successful solution to the problem should be clearly communicated and justified (design problem).
A solution path is selected and justified by evaluating and comparing competing design solutions based on jointly developed and agreed-upon design criteria and constraints (design problem).
Essential Questions
What are the consequences to the final solution if the design problem is poorly communicated?
How does one know that a given design solution is the best possible solution?
What quality makes a set of drawings sufficient to adequately represent the design intent?
Is it always necessary to indicate a tolerance for every dimension on a technical drawing?
In your opinion which step of the design process is most important to successfully innovate or invent a new product?
Priority TEKS
Identify and differentiate between size dimensions and location dimensions
Identify and correctly apply chain dimensioning or datum dimensioning methods to a technical drawing.
Identify dimensioning standards commonly used in technical drawing
Identify, define and explain the proper use of a section view in technical drawing.
Identify and differentiate among limit dimensions, a unilateral tolerance, and a bilateral tolerance.
Explain each assembly constraint (including mate, flush, insert, and tangent), its role in an assembly model
Generate & dimension section views using CAD according to standard engineering practice.
Annotate (including specific and general notes) working drawings according to accepted engineering practice.
Activities
Dimensioning Guided Notes
More dimensioning
Sectional Views
Tolerances Guided Notes
Tolerances Activity
Assemblies Guided Notes
Assemblies Models
Engineering Documentation Guided Notes
Engineering Documentation
Product Improvement