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OKUMA Spindle Drive
Brand: OKUMA -
Code:VACII D-8A
| Combination name | Availability | Price |
|---|---|---|
AC Spindle Drive – OKUMA VACII D-8A
The VACII D-8A is an AC spindle drive amplifier (“AC Spindle Drive”) manufactured by OKUMA, belonging to the VAC II series of AC spindle drive units. The module is designed to operate within OKUMA CNC systems fitted with the proprietary OSP (OKUMA Servo Pack) controller, typically installed in OKUMA machining centres and CNC lathes produced during the 1980s–1990s. The designation “D-8A” identifies the power/current variant within the VAC II family; it governs AC spindle motor torque and speed, interfacing directly with the OSP controller module.
The spindle drive is the power electronics module that converts three-phase AC mains voltage into variable voltage and frequency for the spindle motor, closing the speed and torque loop based on CNC reference commands. Without it the spindle cannot be speed-controlled or smoothly accelerated and decelerated: any failure causes an immediate machine stop and makes further machining impossible.
OKUMA Corporation is one of Japan’s leading CNC machine tool manufacturers, founded in 1898 and headquartered in Oguchi, Aichi, Japan. It is one of the few manufacturers worldwide to design and integrate the machine, motor, drive and CNC control in-house through the proprietary OSP system. Products in the VAC II series are legacy / discontinued: available exclusively as used spare parts, surplus stock, or through specialist repair services.
Main Technical Specifications
| Type | AC Spindle Drive amplifier |
| Part number | VACII D-8A (VACIID8A) |
| Brand | OKUMA Corporation |
| Known application | OKUMA CNC machining centres and lathes with OSP control (1980s–1990s) |
| Function | AC spindle motor speed and torque regulation; current and speed loop control |
| Input voltage | 200–230 V AC three-phase, 50/60 Hz |
| Rated output current | ~8 A nominal output |
| Control system | OKUMA OSP (OSP5000L, OSP7000 and compatibles) |
| Interfaces | Proprietary OSP control bus; edge / ribbon connectors and power terminals |
| Protections | Over-temperature, over-current, short-circuit (typical of the series) |
| Weight | ~5–12 kg |
| Dimensions | ~250×400×200 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
