TOTAL DEPTH
In the study of the lever escapement, the total depth is the angle through which the escape wheel turns while one of its teeth remains in contact with a pallet stone of the lever, from its drop (impact) on the resting plane until the end of the impulse. It thus combines two phases: the rest, during which the tooth remains stationary on the resting plane of the lift, and the impulse, during which the tooth slides on the inclined plane and transmits energy to the balance. Mastery of Total depth is essential to the proper functioning of the Escapement: it determines the safety, efficiency and energy consumption of the system. Poorly adjusted depth results in amplitude defects, stopping points or premature wear of the Lift and the wheel. This parameter, studied by escapement theory, guides the design of the teeth and Pallet stones as well as the Escapement-making (finishing) operations. It illustrates the fine geometry that governs the beating heart of the movement mechanism.
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