Which inspection method is effective for checking belt durability?

The correct answer focuses on the visual inspection of surface wear, which is a crucial method for assessing the durability of a belt. This involves examining the belt for signs of wear and tear, including fraying, cracks, or any significant reduction in thickness. Such visual cues indicate how well the belt has been maintained and whether it is still fit for use.

Visual inspections are often the first step in a comprehensive maintenance program, allowing supervisors to catch potential issues before they lead to more serious failures. Other methods like measuring rope length or checking bolt torque may provide insights into the overall mechanics of the system but do not directly reflect the wear and tear experienced by the belt itself. Evaluating gear speeds is more about the performance of the machinery rather than the condition of the belt. Thus, conducting regular visual inspections is essential in maintaining the reliability and longevity of the equipment by identifying issues early on.