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Questions and Answers
What type of gear is equivalent to two helical gears, one having a right-hand helix and the other a left-hand helix?
What type of gear is equivalent to two helical gears, one having a right-hand helix and the other a left-hand helix?
What is the nominal diameter of bolts?
What is the nominal diameter of bolts?
What type of lubrication involves manual or drip lubrication?
What type of lubrication involves manual or drip lubrication?
What is the opposite of clearance for the mating of cylindrical parts in which the internal member is larger than the external member?
What is the opposite of clearance for the mating of cylindrical parts in which the internal member is larger than the external member?
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What type of brake works by using an electromagnet to slow a rotating wheel?
What type of brake works by using an electromagnet to slow a rotating wheel?
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What is the characteristic of a stress-strain curve for a glass rod during a tensile test?
What is the characteristic of a stress-strain curve for a glass rod during a tensile test?
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What is the ratio of the number of teeth to the pitch diameter of a gear?
What is the ratio of the number of teeth to the pitch diameter of a gear?
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What type of key is used where maximum torque capacity is desired?
What type of key is used where maximum torque capacity is desired?
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What is the radial distance between the sharp crest and the cylinder that bounds the crest?
What is the radial distance between the sharp crest and the cylinder that bounds the crest?
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What is the term for quantities that are completely specified when their magnitude is known?
What is the term for quantities that are completely specified when their magnitude is known?
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What is the ratio of stress acting on an elastic substance to the decrease in volume per unit volume?
What is the ratio of stress acting on an elastic substance to the decrease in volume per unit volume?
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What is the ability of a material to withstand completely reversing loads?
What is the ability of a material to withstand completely reversing loads?
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What is the ratio of the circumference of the pitch circle to the number of teeth?
What is the ratio of the circumference of the pitch circle to the number of teeth?
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What type of thread is commonly used in manufacturing?
What type of thread is commonly used in manufacturing?
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What is the angle included between the sides of the thread measured in the axial plane of a screw thread?
What is the angle included between the sides of the thread measured in the axial plane of a screw thread?
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What is the depth of tooth space below the pitch circle?
What is the depth of tooth space below the pitch circle?
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What is the property of a material that relates the lateral strain to the longitudinal strain?
What is the property of a material that relates the lateral strain to the longitudinal strain?
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What is the characteristic of a material that enables it to withstand forces that cause twisting?
What is the characteristic of a material that enables it to withstand forces that cause twisting?
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Study Notes
Gear Types
- Two helical gears, one with a right-hand helix and the other with a left-hand helix, are equivalent to a double helical gear (or herringbone gear).
Bolt Specifications
- The nominal diameter of bolts typically refers to the major diameter, which is the largest diameter of the threaded portion.
Lubrication Types
- Manual or drip lubrication refers to lubrication by the application of grease or oil without using pressurized systems.
Mating of Cylindrical Parts
- The opposite of clearance in cylindrical part mating is known as interference when the internal member is larger than the external member.
Electromagnetic Brakes
- An electromagnetic brake uses an electromagnet to generate a force that slows down or stops a rotating wheel.
Stress-Strain Characteristics
- The stress-strain curve for a glass rod during a tensile test typically shows a brittle behavior, with minimal plastic deformation before fracture.
Gear Ratios
- The ratio of the number of teeth to the pitch diameter of a gear is called the gear's tooth density or gear ratio.
Key Types
- A woodruff key is commonly used where maximum torque capacity is desired due to its unique design.
Radial Distance
- The radial distance between the sharp crest of a gear tooth and the bounding cylinder is known as the addendum.
Quantities Description
- Exact quantities are those that are completely specified by their known magnitude, such as length or mass.
Stress Ratio
- The ratio of stress acting on an elastic material to the decrease in volume per unit volume is known as the bulk modulus.
Material Strength
- The ability of a material to withstand completely reversing loads is referred to as fatigue strength.
Pitch Circle Circumference Ratio
- The ratio of the circumference of the pitch circle to the number of teeth is referred to as the pitch of the gear.
Common Thread Types
- Unified National Thread is a type of thread commonly used in manufacturing for its standardized dimensions.
Thread Angle
- The angle included between the sides of a screw thread, measured in an axial plane, is typically 60 degrees for standard threads.
Tooth Space Depth
- The depth of tooth space below the pitch circle is termed the dedendum.
Material Strain Properties
- The property of a material relating lateral strain to longitudinal strain is known as the Poisson's ratio.
Twisting Strength
- The characteristic of a material to withstand forces causing twisting is referred to as its torsional strength.
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Description
Test your knowledge of machine design fundamentals, including gear specifications and key types. This quiz covers the basics of gear design and key selection.
