Fanuc AC Servo Motor A06B-1425-B103 A06B1425B103 AO6B-1425-B1O3

αi 3/12,000, Flange Mount, Smooth Bore, Rear Sensor

Part Number: A06B-1425-B103
Also Searched As: A06B1425B103, FANUC A06B-1425-B103, Fanuc A06B1425B103
Motor Model: αi 3/12,000
Classification: Fanuc Alpha i Series AC Spindle Motor -- 12,000 RPM Maximum Speed, 3.7 kW, Flange Mount, Smooth Bore Shaft, Rear IMZ Sensor, αiSP Amplifier Compatible

This motor is specifically engineered for compact to mid-size VMCs handling aluminium alloy, non-ferrous materials, and light steel cutting. The spindle needs to run fast enough to keep small-diameter carbide tools in their productive cutting range while delivering sufficient continuous output for genuine material removal without bogging down under sustained cutting load.

The 3.7 kW continuous power rating provides meaningful cutting capability. At 12,000 rpm, surface speeds for a 5mm end mill approach 188 m/min -- within the productive window for aluminium alloy milling with quality carbide geometry. For a 10mm cutter at the same speed, the surface speed suits aggressive finishing in mild steel.

The motor's torque at rated speed sustains cutting without the spindle dropping rpm during feed moves, maintaining consistent surface finish and predictable tool life.

Important note: This is the standard αi 3/12,000 without through-spindle coolant. The αiT designation identifies motors with an internal coolant bore for pressurized coolant delivery through the spindle. For machines configured for flood or mist coolant, this standard configuration is correct.

The flange mounting fixes the motor to the machine's spindle housing through a precision-ground bolt face. When the flange registers to its mating surface, the motor's rotational axis is established automatically -- no shimming or iterative realignment required.

For a spindle motor running at 12,000 rpm, this precision alignment is critical. Misalignment introduces synchronous vibration that affects surface finish and bearing life over time. Flange mounting eliminates this variable entirely.

Smooth bore (SLK) means the motor's shaft coupling interface has no keyway. Torque is transmitted through the coupling arrangement using interference fit, friction, or coupling geometry. This design keeps rotating mass symmetrical, minimizing imbalance at high speeds.

The rear IMZ sensor provides the CNC with a once-per-revolution position reference pulse, enabling rigid tapping, synchronized thread cutting, and spindle orientation for automatic tool change. The rear placement keeps the sensor clear of the drive-end coupling and simplifies cable routing.

The IMZ rear sensor enables three critical CNC functions:

The A06B-1425-B103 requires Fanuc αiSP series spindle amplifiers. Compatible CNC platforms include Fanuc Series 0i-D, 0i-F, 15i, 16i, 18i, 21i, 30i-A, 30i-B, 31i-A, 31i-B, and 32i.

Not compatible with original α series (non-i) spindle amplifiers or Fanuc β series drives. After installation, verify CNC spindle parameters are correctly set before running production.

Most distributors operate on a core exchange basis -- a rebuildable failed unit must be returned, or an additional core charge applies. Exchange pricing is substantially lower than outright purchase.

Confirm with suppliers whether physically damaged motors qualify as acceptable exchange cores before shipping. Units that cannot be rebuilt typically do not receive core credit.