What type of misalignment occurs when only one end of a workpiece is concentric to the spindle?

What type of misalignment occurs when only one end of a workpiece is concentric to the spindle?

• A. Axial runout
• B. Radial runout
• C. Angular error
• D. Lateral runout

Answer: (A)

The type of misalignment here is axial runout. When only one end of a workpiece is concentric with the spindle, the piece’s axis isn’t true along its length. As the spindle rotates, the end that isn’t coaxial will move toward and away from the spindle nose along the axis, causing the end-to-end position to vary. That movement along the axis is what axial (end) runout describes. Radial runout would involve the surface moving in and out perpendicular to the axis as the part spins, not just a shift along the length. Angular error refers to a twist in orientation around the axis, and lateral runout is another way some texts describe side-to-side deviation, not the end-to-end axial movement.

The type of misalignment here is axial runout. When only one end of a workpiece is concentric with the spindle, the piece’s axis isn’t true along its length. As the spindle rotates, the end that isn’t coaxial will move toward and away from the spindle nose along the axis, causing the end-to-end position to vary. That movement along the axis is what axial (end) runout describes.

Radial runout would involve the surface moving in and out perpendicular to the axis as the part spins, not just a shift along the length. Angular error refers to a twist in orientation around the axis, and lateral runout is another way some texts describe side-to-side deviation, not the end-to-end axial movement.