Product Description:

The 1MR310F-A108 rotor is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Classified as a rotor for a 1MB frameless spindle motor, it forms the rotating core that couples with the stator to deliver torque in high-speed milling and grinding spindles used throughout industrial automation. To withstand the radial forces generated at elevated rpm, the unit employs a step interference fit between the lamination stack and shaft, keeping runout low and ensuring stable operation inside precision machine tool assemblies.

Mechanical proportions are defined by the Frame Size 310, giving the rotor a body envelope matched to the corresponding stator ID. The outside diameter reaches 228.7 mm, a value that determines the air gap and magnetic loading. Axially, the rotor spans an Overall Rotor Length of 400 mm, while a Center Bore Diameter of 109 mm provides a clear channel for coolant tubes or drawbars. A shoulder machined to 147 mm locates the component against the spindle bearing stack, maintaining axial reference. An internal threaded pin prepared to DIN 913 specification enables controlled assembly preload without additional adapters.

For positional alignment with the spindle housing, the rotor features a 108.2 mm end seat diameter that registers against the front clamping nut. The primary end carries a 108 mm H6 bore combined with a 108 mm s6 fit, and the secondary end holds a 107.8 mm H6 bore paired with a 107.8 mm t6 fit; these tolerance pairs establish a uniform interference that matches the rotor design philosophy. The minimum usable spindle stack length is 408 mm, ensuring the Motor Length Code F assembly clears tool release mechanisms without spacer rings. Together these diameters, fits, and the listed DIN fastener standard provide the dimensional framework needed to press-fit the rotor into the stator sleeve while maintaining concentricity along the full magnetic path.