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