- Ball Bearings Single Row
- Ball Bearings Double Row
- Cylindrical Roller Bearings Single Row
- Combined Axial/Radial Load Bearings
- Tapered Roller Bearings
- Multi Row Cylindrical Roller Bearings
For all high-speed and acceleration applications, thrust positioning precision, extra-long life, or intermittent operations with high cyclicity, Umbra proposes hybrid screws with ceramic balls.
The hybrid configuration – alternate ceramic balls with smaller diameter steel balls – alters the kinematics due to the “cage” effect typical of bearings, generated by the presence of “idle” balls.
In almost 20 years of applications – both in the industrial and aeronautic fields – the hybrid solution has demonstrated the utmost reliability in resolving problems of axes that cannot cope with standard steel ball technology.
The absence of rubbing between balls, reduced friction and the diversity between contact materials translate into increased system efficiency, less wear, reduced working temperatures, increased positioning precision, virtually unchanged preload maintenance and longer screw system life.
Umbra screws have successfully achieved axial speeds of 200 m/min and accelerations up to 10 g.
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