Description
Product Overview
When your machining centre tops out at 6,000–8,000 RPM and you’re trying to run a 3mm carbide end mill cleanly through aluminium or engrave a precise scribed line, you’re fighting the tool — underspeed means rubbing, poor finish, and broken cutters. The BIG Daishowa High Spindle NT40 X76 is a mechanical speed multiplier that bolts directly into your NT40 spindle and multiplies your machine’s output speed by 7x, pushing your effective cutting speed up to 20,000 RPM without a high-frequency spindle unit, inverter drive, or spindle retrofit. That’s the difference between a cutter that cuts and one that chews. This used unit presents in good working condition and comes as a complete kit with collets, chuck, spanners, and tips — ready to put to work.
- 7x mechanical speed multiplication up to 20,000 RPM — purpose-built for small-diameter tooling (engraving cutters, micro end mills, PCB routing, fine boring) where surface speed is everything. Your 3,000 RPM machine becomes a 21,000 RPM spindle at the tool tip without touching the drive train.
- NT40 Taper — mounts directly into any standard NT40 spindle with a 5/8″ drawbar. The tapered shank provides the rigid, repeatable seating that high-speed operation demands.
- BIG Daishowa precision internals — the X76 designation identifies this as part of BIG’s High Spindle series, built around preloaded angular contact bearings specifically selected for high-speed operation. Bearing preload is not an afterthought here; it’s the reason runout stays acceptable at elevated speed where a cheap unit would walk all over the part.
- Kit includes collet system, drill chuck, and scribing/engraving tips — the included 6mm collet and closer, drill chuck, and what appear to be diamond scribing tips make this a multi-function high-speed kit. Switch between drilling, milling, and engraving without changing the spindle unit.
- Ideal for — high-speed engraving on machining centres, PCB drilling, micro end milling in aluminium and plastics, fine die-sinking work, scribing layout lines on hardened surfaces, and anywhere a standard spindle speed is the limiting factor on small-diameter tooling performance.
Condition
Used (Good Condition / Complete Kit, Stored in Original Box)
The body of the High Spindle unit shows the expected surface patina and handling marks consistent with prior workshop use — nothing unusual for a precision accessory that’s been on a shop floor. The NT40 taper shank shows no visible damage, burrs, or fretting that would compromise seating in the spindle; the taper contact surface appears intact and serviceable. The collet nose and clamping components appear complete and functional. Internally, the bearing feel (spin the output by hand) should be checked by the buyer on receipt — the unit should spin freely with no roughness, notchiness, or play perceptible at the nose. Any high-speed spindle that has seen use warrants a brief runout check at low speed with a test indicator against a known-good ground bar before committing it to production work; this is standard practice regardless of brand or condition. The included accessories — collet spanners, drill chuck, 6mm collet and closer — are present and appear serviceable. The tips included with the kit have not been fully identified by the seller; they are possibly diamond scribing/engraving tips, so the buyer should inspect these on receipt and verify suitability for their intended application.
The unit has been stored in its original BIG Daishowa packaging, which is a good indicator of how it has been kept — not rattling around loose in a drawer.
Included:
- 1 x BIG Daishowa High Spindle NT40 X76 speed multiplier unit (7x, 20,000 RPM max)
- 2 x Collet spanners (23mm, as visible in image)
- 1 x Small drill chuck with arbor
- 1 x 6mm collet and collet closer
- 1 x Spare collet
- 1 x Set of tips (possibly diamond engraving/scribing tips — buyer to verify)
- 1 x Original BIG Daishowa box/packaging
Not included: No additional collet sizes beyond those listed above.
Brand Information
BIG Daishowa (BIG Kaiser / Daishowa Seiki Co., Ltd.) is a Japanese precision toolholding manufacturer with decades of standing in the global CNC and toolroom market. Founded in Osaka, the company sits firmly at the top tier of toolholding technology alongside Kennametal, Sandvik Coromant, and Rego-Fix — known specifically for their high-accuracy collet systems, hydraulic chucks, and precision boring heads used in aerospace, automotive, and die-mould machining. Their High Spindle series is a well-regarded solution for extending the capability of standard machining centres into high-speed micro-machining territory without the cost of a dedicated high-speed machine. Japanese manufacture is a meaningful quality indicator here — the bearing selection, housing tolerances, and spindle geometry in BIG Daishowa products are built to toolroom standards, not catalogue standards.
Specifications
| Feature | Specification |
|---|---|
| Brand | BIG Daishowa (Daishowa Seiki Co., Ltd.) |
| Model | High Spindle X76 (NT40 shank) |
| Type | Mechanical high-speed spindle multiplier |
| Speed Multiplication Ratio | 7x input spindle speed |
| Maximum Output Speed | 20,000 RPM |
| Shank / Mount | NT40 (ISO 40 taper, National Taper 40) with drawbar thread |
| Drive Method | Mechanical (machine spindle torque driven — torque arm/reaction bar required for operation) |
| Collet System | ER-style or proprietary collet nose (verify collet type on receipt — 6mm collet included) |
| Included Collet Size | 6mm (+ 1 spare collet) |
| Included Accessories | Collet spanners (23mm), drill chuck with arbor, 6mm collet and closer, spare collet, scribing/engraving tips (type TBC), original box |
| Country of Origin | Japan |
| Condition | Used — Good Condition, stored in original packaging |
| Not Included | Drawbar (machine-supplied); additional collet sizes |
Keywords
BIG Daishowa High Spindle NT40, BIG Daishowa X76 speed multiplier, high speed spindle NT40 machining centre, Daishowa Seiki high spindle, NT40 spindle attachment, speed increaser machining centre, high speed spindle 20000 RPM, micro milling high speed spindle, engraving spindle CNC, toolroom high speed attachment, NT40 toolholder Australia, machining centre spindle multiplier
