PMMI REVIEW - Couplings

Describe the function of a solid coupling

• A solid coupling functions to rotate the shafts in opposite directions.
• A solid coupling functions to separate two shafts for flexibility.
• A solid coupling functions to connect two shafts together rigidly for power transmission.
• A solid coupling functions to absorb vibrations in the shafts.

Describe the function of a sleeve coupling

• A sleeve coupling is used for heat dissipation between shafts
• A sleeve coupling is designed to increase rotational speed of shafts
• A sleeve coupling is used to connect two shafts together while allowing for misalignment.
• A sleeve coupling is used to store lubricants for the shafts

Describe the effect of thermal expansion on coupling alignment

• Thermal expansion has no impact on coupling alignment
• Coupling alignment improves with thermal expansion
• Thermal expansion can cause misalignment in couplings due to differential expansion rates of the connected components.
• Couplings expand uniformly with temperature changes

Describe coupling misalignment in a mechanical drive system

• Is when the gears are too small

• Is caused by excessive lubrication

• Is a result of over-tightening the bolts

• Occurs when the input and output shafts of the system are not properly aligned.

What cause shaft misalignment in a mechanical drive system

• Improper installation, wear and tear, thermal expansion, or excessive loads
• Lack of lubrication, over-tightening, incorrect material choice
• Vibration, electrical interference, incorrect gear ratio
• Corrosion, improper maintenance, inadequate power supply

Describe the what soft foot is

• Soft foot is a type of shoe designed for comfort
• Soft foot is a term used in dance to describe a gentle step
• Soft foot is a condition where one or more of the feet of a machine are not in the same plane as the others, causing misalignment and potential issues with operation.
• Soft foot is a condition where a machine operates silently

what does elastomeric mean when choosing a coupling

• Elastomeric indicates that the coupling is intended for use in low-temperature environments, without any impact resistance.
• Elastomeric refers to the coupling being designed for high-speed applications only, neglecting any misalignment compensation.
• Elastomeric means the coupling is made of a hard, rigid material that does not provide any flexibility or shock absorption.
• Elastomeric means the coupling is made of an elastic material that can absorb shock and vibration, providing flexibility and compensating for misalignment.

What is one advantage of a grid coupling

• Reduces vibration significantly

• Requires frequent maintenance
• Increases energy efficiency
• Reduces noise levels

Do couplings need lubrication?

• Yes
• Rarely
• Sometimes
• No

What is one type of coupling that needs lubrication

• Chain coupling

• Magnetic coupling
• None

• Rigid coupling