Watch bezel adjustment torque testing

Solution

• Software-controlled precision torque testing system with motorised drive
• High-sensitivity torque cell for measuring low torque values
• Custom fixtures to securely position the watch case and engage the bezel

Benefits

• Accurate torque measurement to refine tactile response and usability
• Consistent and repeatable evaluation across different watch designs
• Enhanced confidence in perceived quality and functional reliability

Requirement

Based on the revival of mechanical watch machine production in the 1980s, the emphasis on fine mechanical production has grown dramatically. Minor differences in component behavior can also affect user experience, as well as the perceived product quality. Despite aesthetic considerations, all watches must meet defined mechanical performance criteria verified through rigorous testing.

A premium watch manufacturer required a precise assessment of the rotational torque of a diver’s bezel. This is a unidirectional bezel that is designed and made to travel in the same direction to prevent any instance of adjusting it accidentally, especially when it is in an underwater setting, in addition to being able to operate intentionally when it is used with gloves.

A ratchet system is usually in place in the bezel mechanism. Over time, wear in the internal spring can alter performance, leading to reduced resistance or unintended bidirectional movement. The aim was to test the initial torque needed to initiate movement and the torque profile of the further movement with measured angular distance.

Solution

A customized attachment was designed that fit perfectly to the case of the watch, guaranteeing a consistent location when testing. A corresponding upper fixture was designed to interface precisely with the bezel, enabling controlled torque application without slippage.

The assembly was integrated with a precision torque testing system equipped with a static torque sensor and advanced control software. The system recorded torque values in real time and generated torque versus angle graphs, automatically identifying peak torque across the specified rotation range.

Test data was exported in structured reports to support traceability and further analysis. This enabled design engineers to assess rotational consistency, engagement feedback, and overall performance against defined specifications.

Similar methodologies are also applied to evaluate torque characteristics of watch mechanisms such as gear trains, winding systems, and micro-components, where precise rotational control is critical.

Test equipment

• Precision software-controlled torque tester.
• Torque sensor matched to low-range measurement requirements.
• Custom fixtures for accurate positioning and bezel engagement.