When jaws are being changed in a universal chuck, what must be watched?

When jaws are being changed in a universal chuck, what must be watched?

• A. The numbers
• B. The alignment marks
• C. The lubrication level
• D. The jaw widths

Answer: (A)

Jaws in a universal chuck are paired with specific positions around the chuck, so they must be returned to their exact slots when changed. Returning each jaw to its original position preserves concentricity, balance, and repeatable gripping. The marks on the jaws indicate where they belong, guiding correct replacement. If a jaw ends up in the wrong place, gripping becomes off-center and runout increases, leading to poor holding or part damage. Lubrication level or jaw width isn’t the factor to watch during this process; the essential point is keeping each jaw in its proper position.

Jaws in a universal chuck are paired with specific positions around the chuck, so they must be returned to their exact slots when changed. Returning each jaw to its original position preserves concentricity, balance, and repeatable gripping. The marks on the jaws indicate where they belong, guiding correct replacement. If a jaw ends up in the wrong place, gripping becomes off-center and runout increases, leading to poor holding or part damage. Lubrication level or jaw width isn’t the factor to watch during this process; the essential point is keeping each jaw in its proper position.