Roku-Roku MEGA SSS-400/600 High-Speed CNC Milling Center
Reviewed by Steve Brown, Precision Milling Specialist —Iron Machine Tool | Nearly 16 years selling and supporting OPS-Ingersoll and Roku-Roku precision milling centers across Minnesota, Wisconsin, Iowa and Illinois.
Roku-Roku MEGA SSS-400 CNC Milling Machine
40,000 or 60,000 RPM Micro-Milling VMC for Precision Manufacturers
Iron Machine Tool distributes the Roku-Roku MEGA SSS-400/600 vertical machining center to precision manufacturers across Minnesota, Wisconsin, Iowa and Illinois. Available with a 40,000 RPM (SSS-400) or 60,000 RPM (SSS-600) oil-mist lubricated spindle, this machine is purpose-built for small-hole drilling, micro-fine milling, and tight-tolerance electrode work where surface quality and repeatability cannot be compromised. The HSK-E25 tooling interface, Heidenhain linear scales on all three axes, and a Fanuc 31i-B5 controller with AI Contour Control II and NANO interpolation combine to deliver measured circularity of 0.000039 in (1.0 micron) at 2.0 in diameter. This is a machine built for shops that need speed, rigidity, and repeatable micro-accuracy in a compact footprint.
Technical Specifications
| Specification | SSS-400 / SSS-600 |
| Spindle Speed | 3,000 to 40,000 RPM (SSS-400) / 3,000 to 60,000 RPM (SSS-600) |
| Spindle HP | 4.7 |
| Spindle Lubrication | Oil Mist |
| Spindle Taper | HSK-E25 |
| Machine Travels X x Y x Z | 16.1 x 13.0 x 7.9 in (410 x 330 x 200 mm) |
| Table Work Area X x Y | 23.6 x 13.0 in (600 x 330 mm) |
| Max Workpiece Weight | 220 lb (100 kg) |
| Tool Changer | 20 Position Standard |
| Positioning Accuracy | ±0.000040 in (±1.0 µm) |
| Repeatability | ±0.000012 in (±0.3 µm) |
| Measured Circularity (2.0 in dia @ 8 IPM) | 0.000039 in (1.0 µm) |
| Linear Scales | Heidenhain 0.000002 mm — X, Y, Z Standard |
| Rapid Traverse | 590 in/min (15.0 m/min) |
| Cutting Speed (Normal Mode) | 0.04 to 394 in/min (1 to 10,000 mm/min) |
| Cutting Speed (GR Super PC Mode) | 590 in/min (1.5 m/min) |
| Table to Spindle Nose Distance | 1.97 to 9.84 in (50 to 250 mm) |
| Table Height from Floor | 29.5 in (750 mm) |
| Coolant Tank Capacity | 20 gal (75 L) |
| Machine Weight | 5,732 lb (2,600 kg) |
| Machine Height | 82.3 in (2,090 mm) |
| Floor Space Required | 74.4 x 78.7 in (1,890 x 2,000 mm) |
| CNC Controller | Fanuc 31i-B5 Super High-Speed Processor with AI Contour Control II and NANO Interpolation |
| Power Requirements | 200 to 220V / 14.0 KVA |
| Air Supply | 9 cu ft/min at 72 psi |
| Spindle Air Purge | Standard |
| Oil Mist with Collector | Optional |
MEGA SSS-400/600 Key Capabilities
- Ultra-High-Speed Spindle — Two Configurations
The SSS-400 runs to 40,000 RPM; the SSS-600 pushes to 60,000 RPM. Both use an oil-mist lubricated AC motor spindle with a wide operating range (3,000 RPM minimum) that accommodates roughing and finishing in the same setup. The HSK-E25 taper provides the rigidity and precise tool seating that micro work demands.
- Heidenhain Linear Scales on All Three Axes
Glass scale feedback at 0.000002 mm resolution on X, Y, and Z eliminates ballscrew thermal error from the accuracy equation. The result: positioning accuracy of ±1.0 µm and repeatability of ±0.3 µm verified, measurable numbers, not marketing claims.
- Fanuc 31i-B5 with AI Contour Control II and NANO Interpolation
The control system runs the machine, not the operator's reflexes. AI Contour Control II reads ahead in the program to optimize feed rates through complex contours. NANO interpolation smooths motion between interpolation points, directly improving surface finish at high feed rates.
- High-Rigidity Structure with Z-Axis Balance Cylinder
The MEGA SSS-400/600 uses a high-rigidity casting and a Z-axis balance cylinder that counteracts spindle head weight during rapid vertical moves. This keeps cutting forces predictable and thermal deformation low during continuous high-speed operation.
- Compact Footprint, Modular Design
At 74.4 x 78.7 in floor space and 5,732 lb, this is a capable micro-machining VMC that fits into shops where space is a constraint. The modular design supports future configuration changes without replacing the base machine.
Ready to evaluate the MEGA SSS-400/600 for your shop?
Contact Steve Brown at Iron Machine Tool for a direct application discussion. Authorized Roku-Roku distributor serving MN, WI, IA and IL.
Why Source Your Roku-Roku VMC Through Iron Machine Tool
Iron Machine Tool is an authorized distributor of Roku-Roku precision milling centers, serving manufacturers across Minnesota, Wisconsin, Iowa and Illinois. Steve Brown brings nearly 16 years of direct experience selling and supporting precision milling centers in this region. That experience shows up in pre-sales conversations: before a machine is specified, Steve works through your part geometries, tolerances, spindle speed requirements, and tooling to make sure the SSS-400 or SSS-600 is actually the right fit for your application. If it is not, he will tell you.
Regional manufacturers benefit from distributor-level access to application support, machine integration guidance, and a direct line to the people who know these machines technically, not just commercially.
Contact Steve Brown directly to discuss your application before committing to a specification.
Who Uses the MEGA SSS-400/600
The MEGA SSS-400/600 is the right machine for manufacturers working to tight tolerances on small, complex geometry:
Plastic Injection Mold Shops
Micro gate milling, direct gate milling, and electrode machining at tolerances that cannot be held on a conventional VMC.
Medical Device Manufacturers
Small-feature machining on implants, instruments, and components where surface finish and dimensional accuracy are non-negotiable.
Aerospace and Defense Suppliers
Micro-drilling and contour milling on precision parts where standard machining centers run out of speed and rigidity before the feature is complete.
Tool and Die Shops
Graphite electrode production and fine cavity work where the electrode quality directly determines the EDM burn quality downstream.
R&D and Prototype Shops
High-speed micro-machining capability without the footprint or investment of a large production VMC.
Frequently Asked Questions MEGA SSS-400/600
A: The SSS-400 has a maximum spindle speed of 40,000 RPM; the SSS-600 reaches 60,000 RPM. Both share the same machine frame, travels, table, and Fanuc 31i-B5 controller. The choice depends on your tooling diameter requirements and surface finish targets. Smaller diameter tools and finer surface finish applications typically benefit from the higher RPM ceiling of the SSS-600.
A: The machine uses HSK-E25 tool holders, a high-rigidity interface designed for high-speed machining where tool runout and clamping force consistency directly affect surface finish and tool life.
A: The machine runs a Fanuc 31i-B5 super high-speed processor with AI Contour Control II and NANO interpolation. This controller handles complex micro-contour programs and optimizes feed rates dynamically through tight geometries.
A: Yes. Heidenhain linear scales at 0.000002 mm resolution are standard on all three axes. This provides closed-loop position feedback independent of the ballscrew, which directly supports the machine's positioning accuracy of ±1.0 µm and repeatability of ±0.3 µm.
A: Measured circularity at 2.0 in diameter at 8 IPM is 0.000039 in (1.0 µm). This is a tested, documented figure, not a specification estimate.
A: Yes. Iron Machine Tool distributes Roku-Roku precision milling centers across Minnesota, Wisconsin, Iowa and Illinois. Contact Steve Brown to discuss your application, site requirements, or machine integration questions before purchase.
A: The MEGA SSS-400/600 is designed for small-hole drilling, micro-fine milling, graphite electrode machining, and precision die work. Industries that use this machine regularly include plastic injection molding, medical device manufacturing, aerospace component production, and tool and die work.
Ready to evaluate the MEGA SSS-400/600 for your shop?
Contact Steve Brown at Iron Machine Tool for a direct application discussion.Authorized Roku-Roku distributor serving MN, WI, IA and IL.