Patient table for radiation therapy - an accurate patient positioning system

A project where the requirements for precision and performance of a gearbox were extremely high, which made it impossible to apply any standard or adapted gearbox.

Patient table for radiation therapy - an accurate patient positioning system

BJ-Gear A/S were asked to deliver gearboxes to a project where the requirements for precision and performance of a gearbox were extremely high, which made it impossible to apply any standard or adapted gearbox.

A BJ-Gear customer wanted to develop a patient table to be used in connection with radiation therapy of brain tumors. The requirements for precision and performance of this gear were extremely high, and therefore it was not possible to apply any standard or adapted gearboxes.
The customers engineers made a proposal for a special gearbox, where the principle was a double-acting ball screw gearbox to achieve a compact design. 
BJ-Gear's engineers performed calculations and determined the final design of the gearbox.

The special gearbox was supplied with a servomotor and holding brake built-on. After having performed thorough static and dynamic tests, the gear motor was released for serial production.
BJ-Gear is responsible for manufacturing of components, for the assembly, testing and commissioning of the gearbox including the servomotor and the holding brake.