CMRT CMRT Mechanical Systems and Alignment

Question 1

What is shaft alignment and why is it critical to equipment reliability?

Accepted Answer

Positioning two shafts so their rotational centerlines are collinear, minimizing vibration and bearing loads

Answer

Balancing the rotating mass so centrifugal forces cancel out

Answer

Verifying that shaft keys and keyways are properly fitted

Answer

Ensuring the shaft is perfectly round and free of taper

Question 2

What are the two primary types of shaft misalignment?

Accepted Answer

Angular misalignment and parallel (offset) misalignment

Answer

Static misalignment and dynamic misalignment

Answer

Horizontal misalignment and axial misalignment

Answer

Radial misalignment and torsional misalignment

Question 3

What is 'soft foot' in machinery alignment, and why must it be corrected before performing alignment?

Accepted Answer

A condition where one or more machine feet do not make solid contact with the base, causing frame distortion when bolts are tightened

Answer

A condition where the machine feet are made of soft metal that deforms under torque

Answer

A term for insufficient bolt preload on machine mounting hardware

Answer

A measurement error caused by temperature fluctuations during alignment

Question 4

Which type of coupling is most tolerant of shaft misalignment while still transmitting torque?

Accepted Answer

Flexible elastomeric coupling

Answer

Rigid (sleeve) coupling

Answer

Jaw (spider) coupling

Answer

Disc coupling

Question 5

What is the purpose of using shims under machine feet during precision alignment?

Accepted Answer

To make fine vertical position corrections and eliminate soft foot conditions

Answer

To increase the height of the machine for better access during maintenance

Answer

To absorb vibration from the machine and prevent transmission to the foundation

Answer

To replace worn or corroded base plate surfaces

Question 6

What alignment measurement tool provides the highest accuracy for modern industrial shaft alignment?

Accepted Answer

Laser alignment system with rotating targets

Answer

Dial indicators mounted on a bracket straddling the coupling

Answer

Straightedge and feeler gauge

Answer

Optical tooling scope and target