By using a mechanically linked system, the whole operation was controlled by one motor which greatly simplified the control system and minimised costs. The two machine screw jacks selected for the system were mechanically linked to the electric motor via one bevel gearboxes.

A three point lift system was devised using three screw jacks, bevel gearboxes, couplings and drive shafts. The system was designed to be quick and easy to use by hand operation while being self-locking. Using metric machine screw jacks on the screw provided a mechanism that was self-locking and minimum torque input for hand operation.

Hydrostatic Pressure Vessel: Test Facility - Lid Lift Screw jack system raises and lowers the access lid. Special units, based on the Metric machine screw jack, with motorised reduction and bevel gearboxes to distribute power to drive each of the four screw jacks. The motor included an integral brake for secure load holding.

Automated adjustable stop mechanisms use translating machine screw jacks in inverted screw configuration. Each stop mechanism uses a six screw jack system that is driven by one electric motor.

Efficiency of a Multiple Screw Jack System: In addition to individual device efficiencies, the efficiency of the screw jack arrangement must be taken into consideration. The arrangement efficiency allows for misalignment due to slight deformation of the structure under load, for the losses in couplings, bearings, and for a normal amount of misalig