Prime Elements in Machine Design - Vocabulary Review

These flashcards cover key terms and concepts related to machine design, including definitions for mechanical properties, components, and operations relevant to engineering.

Torsional Strength

A metal characteristic that withstands forces that cause twisting.

Fillet Radius

Introduced in machine parts to reduce concentration of stress and extend life of the parts.

Hydrostatic Bearing

A bearing in which the lube oil is supplied under pressure.

Bearing Material

Unsuitable materials that should not be used as bearings include low carbon steel.

Safety Features in Machine Shops

Includes safety goggles, walkway guides, and safety notices.

Involute Gear

The angle at the base cylinder of an involute gear that the tooth makes with the gear axis is called the base helix angle.

Gear Types

A helical gear is commonly used for high speed operation.

Mechanical Seal

Used to retain oil and prevent dirt, foreign particles, and moisture in machinery.

Terminal Velocity

The velocity an object reaches when falling under the influence of gravity.

Kinetic Energy

The first derivative of kinetic energy with respect to velocity is known as power.

Ultimate Strength

The maximum stress to which a material may be subjected before failure occurs.

Ductility

The ability of a metal to be drawn into a wire.

Poisson's Ratio

The ratio of lateral strain to longitudinal strain.

Negative Allowance

The condition when the hole is smaller than the shaft, requiring pressure to fit the parts together.

Speed Measurement Device

A tachometer is used to measure speed accurately.

Elasticity

The capacity of a material to return to its original shape after deformation.

Heat Treatment Hardness

Hardness of helical gear teeth after heat treatment usually falls between 210 to 300 Brinell.

Corrosion

The gradual chemical reaction by other substances that converts metal to oxide or other compounds.

Moment of Inertia

A measure of an object's resistance to changes in its rotation.

Herringbone Gear

A type of gear that combines the characteristics of helical gears and spur gears.

Machinery Operation

Shaping is a machinery operation done with the work accurately fastened that has a reciprocating motion.