Which activity is primarily associated with alignment checks in preventive maintenance of an industrial robot?

• A. Inspect and replace belts, lubricants, drive motors, sensors, cables, alignment checks, guarding, and calibrations.
• B. Verify and adjust the mechanical alignment of joints, couplings, and mounting hardware.
• C. Clean lenses of sensors.
• D. Update control software.

Answer: (B)

Mechanical alignment is what alignment checks focus on in preventive maintenance. Verifying and adjusting the mechanical alignment of joints, couplings, and mounting hardware ensures the robot’s arm moves within its design tolerances, preserving accuracy and repeatability and preventing undue wear or binding. When components are not aligned, the end effector can drift from its intended path, joints can experience extra stress, and bearings or gears wear faster, leading to degraded performance or unexpected downtime.

The other tasks address different maintenance areas. Cleaning sensor lenses helps with sensing accuracy, but it doesn’t correct the robot’s geometry. Updating control software changes how the controller commands motion, not the physical alignment of the hardware. The broader maintenance list includes many items, but the activity that directly relates to alignment checks is ensuring the mechanical geometry of the joints and mounts is correct.