A spring locking mechanism in a micrometer torque wrench operates by using a calibrated spring that exerts a restoring force proportional to its compression. The wrench's handle compresses the spring to achieve a specific torque, while a ramp mechanism translates the applied torque into force against the spring. When the applied force exceeds the spring's force, the ramp moves, allowing the drive to freewheel. There is a discussion about whether smaller torque wrenches utilize a deflection mechanism, which may be more sensitive to friction. Overall, the mechanics of the spring locking mechanism are crucial for accurate torque application.
