Dimensioning Standards

The basic standard dimensioning method established by the American National Standards Institute and the American Society of Mechanical Engineers (ANSI or ASME) is used to apply measurements to parts to enable clear communication. In order to communicate effectively, a person needs to understand the rules of the language and to follow the standards set down so that anyone who reads the dimensioned drawing will understand the intent and then be able to manufacture the part correctly.

Continue your practice of dimensioning by applying the appropriate dimensions and learning to understand the thought process that is used to create a clear and concise message regarding the size and shape of an object or product.

Deliverables:

1. Post all 3 drawings of the dimensioned parts you created.
2. Write a reflection on your process addressing these points:

• What is the difference between size dimensioning and location dimensions?
• What is the difference between chain dimensioning and datum dimensioning? Which method generally results in smaller dimensional deviation in manufactured parts?
• What are the similarities and differences between communicating about an object or product part through a dimensioned drawing and through a written description?

Additional Resources:

Dimensioning Standards Power Point