Research on a Controllable Preload Method of High Frequency Spindles with Characteristics of Low-Speed Heavy and High-Speed Light Loads

In order to overcome the weakness of a traditional constant preload method which leads to the preload being too small at low speeds and too big at high speeds, a controllable preload method of motorized spindles is proposed.The dynamic performance of motorized spindles with the two preload methods mentioned above is compared.It is shown that the motorized spindle with a controllable preload method can satisfy the machining requirement of heavy cutting at low speeds and light cutting at high speeds well.