What is the monthly accessory tray position tolerance?

• A. 2 mm
• B. 1 mm
• C. 3 mm
• D. 2.5 mm

Answer: (A)

Position tolerance controls how far the true position of a feature can wander from its intended location, typically defined as a cylindrical zone around the true position with a specified diameter. For a monthly accessory tray, this means the mounting or locating features must sit within that 2 mm zone relative to their datum references. 2 mm provides a practical balance: it’s tight enough to keep the tray aligned with mating parts and avoid interference, yet loose enough to accommodate normal wear, thermal changes, and measurement variability encountered in monthly inspections. Smaller tolerances would raise cost and reject risk due to wear, while larger ones could lead to misalignment with other components. Hence, 2 mm is the most sensible choice.