Product Description:

The ADF104B-B05TB1-DS06-A2N2 is an asynchronous main spindle unit produced by Bosch Rexroth Indramat for the ADF Main Spindle Motors series. It is a liquid-cooled drive for machine tools that supplies continuous rotary power to cutting or grinding spindles. Stable thermal behavior helps limit growth at the spindle and supports dimensional accuracy during automated machining cycles. It is intended for machine-tool spindles that need stable speed control during milling, drilling, and grinding operations.

With flange mounting, the motor seats directly against the machine frame so runout is controlled by the geometry of the mating housing. The active section uses motor size 104 with B length, giving a longer magnetic stack for higher torque density within the same diameter. The DS winding code matches the phase resistance and inductance to the expected spindle duty cycle, while digital servo feedback returns position and speed data for fast closed-loop control. That arrangement lets the CNC react quickly to load changes without relying on a separate external encoder package. The unit is supplied without a holding brake, so any standstill clamping must be handled by an external mechanism.

Dynamic accuracy is supported by the S DIN ISO 2373 balance grade, which limits residual vibration at high speed. Power enters through a connector on side B with the housing oriented at the top, keeping cable routing clear of coolant lines, and the interface uses a single-cable plug. The motor has a plain shaft for precise fit with the tool clamping assembly, and it is supplied without a shaft seal ring, so coolant isolation relies on the machine’s own sealing arrangement. The absence of a second shaft end helps keep inertia low, and the standard bearing set with a standard coolant connection supports continuous liquid flow around the stator jacket for stable winding temperature. The single-cable connection also reduces the number of external motor interfaces and keeps the installation layout compact.