In aligning a flexible coupling, which two planes must be considered?

In aligning a flexible coupling, which two planes must be considered?

• A. Parallel and angular
• B. Vertical and horizontal
• C. Radial and tangential
• D. Inner and outer

Answer: (A)

When aligning a flexible coupling, you’re correcting two independent misalignment components between the shafts: parallel (offset) and angular. Parallel misalignment is a constant sideways gap between the shaft axes along the length of the coupling, while angular misalignment is a tilt between the axes that causes the gap to vary along the coupling. Measuring and adjusting in two planes across the coupling lets you address both types: one plane handles the offset, the other handles the angle, so the shafts end up coaxial and colinear. The other options don’t describe these two fundamental misalignment components or the appropriate measurement planes used in this alignment process.

When aligning a flexible coupling, you’re correcting two independent misalignment components between the shafts: parallel (offset) and angular. Parallel misalignment is a constant sideways gap between the shaft axes along the length of the coupling, while angular misalignment is a tilt between the axes that causes the gap to vary along the coupling. Measuring and adjusting in two planes across the coupling lets you address both types: one plane handles the offset, the other handles the angle, so the shafts end up coaxial and colinear. The other options don’t describe these two fundamental misalignment components or the appropriate measurement planes used in this alignment process.