Machines Ch1

What is a standard?

A set of specifications for parts, materials, or processes.

What is a code?

A set of specifications for the analysis, design, manufacture, and construction of something.

What is the first principle of cost reduction?

The use of standard sizes.

Close tolerances generally _____ (increase/decrease) cost

Increase - require additional processing steps, additional inspection, machines with lower production rates

What is the strict liability concept?

A party can be held responsible for causing harm or breaking a law, even if they did not act with criminal intent. Defense is by proving due diligence.

Strength is an ____ (intrinsic, extrinsic) property of a material or mechanized element, and it depends on _____ and _____.

Intrinsic, treatment, processing.

True or False: Strength is always uniform throughout a part

False.

Stress is a _____ property at a specific point within a body. It is primarily a function of ____ and ____, but sometimes also ____ and ____.

State, load, geometry, temperature, processing.

What is a nominal dimension?

A nominal dimension is a generally understood, approximate size or name for a product that may not match its exact, actual dimensions.

What does limits mean?

The stated max and min dimensions.

What is the tolerance?

The difference between the max and min limits.

What is bilateral tolerance?

The variation in both directions from the basic dimension.

What is unilateral tolerance?

The basic dimension IS one of the limits. Variation is only permitted in one direction.

What are the two types of uncertainty?

Deterministic, stochastic

Deterministic uncertainty is based on the….

Absolute uncertainties of loss of function

Stochastic uncertainty is based on….

the statistical nature of the design parameters