Introduction to Engineering Design - Measurement and Statistics
Describe the difference between the meaning of the terms accuracy and precision in scientific measurement.
Accuracy: The degree of closeness of measurements of a quantity to the actual (or accepted) value.
Precision: The degree to which repeated measurements show the same result.
How can statistical and analyzed data be used to inform, justify, and validate a design or process?
Answer: Statistics are commonly used in manufacturing processes to control and maintain quality. A statistical analysis is used to determine measures of central tendency and variation of the data.
What is dimensional analysis and how can it help solve problems involving quantities?
Answer: Preforming a dimensional analysis on a part will assure that all needed dimensions to create the part have been included. This will insure the part is made correctly.
Why do engineers generally adhere to a set of dimensioning standards and guidelines?
Answer: In manufacturing, a part must be dimensioned fully and correctly and to the proper precision. Otherwise, the part may not function properly or may not fit into an assembly as intended. Dimensioning errors can lead to a delay in production time, increased design and manufacturing costs, and a potentially unsafe product.
Why would you have to know how to convert measurements when looking at a technical drawing?
Answer: If they are not in the units preferred by the engineer, they will need to change them
Why is placement of your dimensions so important?
Answer: So they can be read clearly without confusion
How can you use units help you solve a problem?
Answer: If the Units are all the same communication of size and shape are understood with out confusion.
Why do designers need to fully dimension a part?
Answer: A fully dimension part is required to communicate clearly how the part is to be constructed.
What does it mean when a sketch is over dimensioned?
Answer: A sketch is over dimensioned when the same measurement/dimension is on 2 or more of the views: such as the over all width is placed in both the front and top views. This can cause confusion and increase the probability of the part being constructed incorrectly.
Accuracy: The degree of closeness of measurements of a quantity to the actual (or accepted) value.
Precision: The degree to which repeated measurements show the same result.
How can statistical and analyzed data be used to inform, justify, and validate a design or process?
Answer: Statistics are commonly used in manufacturing processes to control and maintain quality. A statistical analysis is used to determine measures of central tendency and variation of the data.
What is dimensional analysis and how can it help solve problems involving quantities?
Answer: Preforming a dimensional analysis on a part will assure that all needed dimensions to create the part have been included. This will insure the part is made correctly.
Why do engineers generally adhere to a set of dimensioning standards and guidelines?
Answer: In manufacturing, a part must be dimensioned fully and correctly and to the proper precision. Otherwise, the part may not function properly or may not fit into an assembly as intended. Dimensioning errors can lead to a delay in production time, increased design and manufacturing costs, and a potentially unsafe product.
Why would you have to know how to convert measurements when looking at a technical drawing?
Answer: If they are not in the units preferred by the engineer, they will need to change them
Why is placement of your dimensions so important?
Answer: So they can be read clearly without confusion
How can you use units help you solve a problem?
Answer: If the Units are all the same communication of size and shape are understood with out confusion.
Why do designers need to fully dimension a part?
Answer: A fully dimension part is required to communicate clearly how the part is to be constructed.
What does it mean when a sketch is over dimensioned?
Answer: A sketch is over dimensioned when the same measurement/dimension is on 2 or more of the views: such as the over all width is placed in both the front and top views. This can cause confusion and increase the probability of the part being constructed incorrectly.
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