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OKUMA ER-FC-2048D
Product name: Spindle encoder (incremental rotary encoder for CNC machine tools)
Product introduction: An OKUMA-brand encoder used primarily as a spindle position/speed feedback element on OKUMA CNC lathes and machining centres. The “2048” designation indicates a resolution in the 2048 pulses-per-rev class, providing the CNC with speed feedback and one-revolution reference for threading, rigid tapping and spindle orientation.
Detailed content
Technical specifications: Incremental optical encoder; resolution nominally 2048 ppr; output A/A̅, B/B̅, Z/Z̅ differential or single-ended line-driver signals; supply typically 5 V DC or 12–24 V DC depending on variant; maximum speed compatible with machine spindle gearing; operating temperature roughly −20 to +85 °C; shielded multi-core cable with aviation/round connector.
Functional features: Real-time spindle speed and angular position feedback; zero-pulse (Z-phase) for thread-start synchronisation and spindle orientation; robust construction resisting cutting-fluid ingress, vibration and temperature variation.
Application scenarios: CNC lathes and turning centres, machining centres with spindle orientation/rigid tapping, servo-spindle closed-loop systems, retrofit of legacy OKUMA controls.
Performance parameters: Resolution 2048 ppr; accuracy and repeatability defined by the encoder disc and bearing runout; response frequency matched to the CNC’s input specification.
Material composition: Aluminium or stainless housing, glass/metal code disc, LED light source and photodetector array, precision bearings, PCB with line-driver ICs.
Structural features: Flange or bracket mount with coupling or gear-drive connection to the spindle rear end; sealed body with cable exit; compact cylindrical form.
Working principle: Light passing through the rotating coded disc is modulated into quadrature pulses; the CNC counts pulses for speed/position and uses the Z pulse as a once-per-revolution reference for synchronised motion.
Installation requirements: Couple concentrically (direct coupling or 1:1 gear train); keep within the permitted radial/axial load and max speed limits; avoid impact and excessive vibration during fitting; use the specified cable with shielding grounded at one end; protect from coolant splash and chips.
Usage precautions: Match resolution, supply voltage, output format and connector pinout to the original; after replacement verify spindle orientation angle and threading synchronisation; handle without dropping and do not disassemble the disc assembly.
