Nexen Group has introduced the Motor Ready Sealed (MRS) precision rotary indexer. The MRS maintains the benefits of the company’s existing patented precision roller pinion drive design – zero backlash, high precision, high torque, and high acceleration – while delivering significant new benefits. It is for precision rotary indexing applications such as machine tools, semiconductor fabrication, robotics, automated welding, medical packaging, assembly and cutting systems.
A high roller pinion-to-gear ratio allows users to direct drive the system with the addition of a servo motor, eliminating the cost of a reducer. This also reduces engineering and installation time. For high load applications, the customer can drive the system with a reducer/motor combination. Additionally, the gear-to-pinion reaction loads are fully supported so the servo motor shaft is not subjected to radial loading, which eliminates the need for costly high output capacity reducers in high load applications. All of these features reduce engineering and installation time.
The MRS precision rotary indexer offers high indexing precision, with one-way positional accuracy up to ± 31 arcsec and one-way repeatability up to ± 5.2 arcsec. There is zero backlash from the motor through the driven load. The MRS can handle high speeds up to 304rpm. For faster installation, it is motor/gearbox ready. Available in sizes of 150, 250 and 350mm output bolt circle diameter, it has a large open centre to optimise performance in small spaces. The MRS is fully sealed and IP65 rated. It is low maintenance and has a long service life.