Röders RFM800

Q: How does the RFM800 compare to the Makino D800Z?

Both are precision HSC machines in the 800 mm travel class targeting mold and die. The Makino D800Z offers a stronger North American dealer and service network, which matters for shops outside Europe. The Röders RFM800 is favored by European mold shops and is known for the RMS6 control's look-ahead performance in graphite and hardened steel finishing. Surface finish results are comparable at the highest level — the choice often comes down to service coverage and control familiarity.

Q: Can the RFM800 handle steel molds and graphite electrodes on the same machine?

Yes. The RFM800 is designed for exactly this dual-purpose use. For steel mold finishing, the 24,000 RPM HSK-A63 spindle provides the torque needed for aggressive stock removal in hardened steels. For graphite electrodes, the 42,000 or 60,000 RPM HSK-E40 spindle delivers the speed needed for clean, burr-free graphite cutting. Röders offers sealed linear way covers and filtration systems for graphite environments.

Q: What surface finish can the RFM800 achieve on hardened tool steel?

Under optimal conditions — proper fixturing, correct toolpath strategy, and appropriate cutting parameters — the RFM800 achieves Ra 0.05 to 0.1 µm on hardened H13 and D2 tool steel. This is mirror-class finish that eliminates or dramatically reduces manual polishing time. The Granitan base and linear motors are the two primary contributors to this capability by minimizing vibration and mechanical compliance.

Q: What is the delivery and installation timeline for a Röders RFM800?

Lead times for Röders machines typically run 6-12 months from order, depending on spindle specification and configuration. Installation requires a precision-leveled foundation and conditioned shop environment. Röders engineers handle installation and calibration. Training is provided at the factory in Soltau, Germany, or on-site through their dealer network.

Q: Is the RFM800 suitable for lights-out machining?

The RFM800 supports automated tool change and can be integrated with pallet handling systems for unattended operation. The linear motor drives have no wear-induced accuracy drift, which is important for maintaining tolerances across unmanned shifts. Most shops running the RFM800 lights-out do so on finishing operations where cycle times are long and tool life is predictable.

$420,000 - $650,000 Updated 2026-03-16

Key Specifications

X Travel

800 mm (31.5 in)

Y Travel

600 mm (23.6 in)

Z Travel

400 mm (15.7 in)

Max Spindle

24,000 RPM (42,000 / 60,000 RPM optional)

Spindle Taper

CT 40

Weight

10,000 kg (22,046 lb)

Overview

The Röders RFM800 extends the RFM platform to an 800 mm X-axis travel, opening the machine to larger mold frames, aerospace structural brackets, and precision fixture plates that exceed the RFM600's capacity. Like its smaller sibling, the RFM800 is built around Röders' core technology stack: Granitan mineral cast base, linear motor drives on all axes, and high-speed spindle options extending to 42,000 or 60,000 RPM — positioning it squarely against Makino's D800Z and Hermle's C 42 in the precision HSC segment.

The Granitan mineral composite base absorbs vibration at a rate roughly ten times greater than gray cast iron, a critical advantage when running high spindle speeds with small-diameter cutters on hardened tool steel. Long finishing passes at 30 m/min or more on complex mold geometries produce surface finishes in the Ra 0.05-0.1 µm range without hand polishing, which is the core value proposition for mold shops evaluating the RFM800.

Linear motors replace conventional ballscrews on all three linear axes, delivering 60 m/min rapids and eliminating the wear-induced backlash that degrades accuracy over time in ballscrew machines. The rotary/tilt table provides full ±120-degree B-axis freedom with a continuous C-axis, enabling five-sided and simultaneous 5-axis work. At 800 mm in X, the table can accommodate mold bases that would need refixturing on the RFM600 or competing compact machines.

The Röders RMS6 CNC control runs look-ahead routines across thousands of NC blocks to maintain feedrates through 3D surface contours, preventing the deceleration artifacts that appear as witness marks on finished mold surfaces. Optional Siemens Sinumerik is available for shops standardized on that ecosystem. The RFM800 is the natural choice for mid-size mold shops running a mix of electrode milling, finish milling of hardened cavities, and high-precision die work on parts up to roughly 800 x 600 mm.

Full Specifications

Parameter	Value
X-Axis Travel	800 mm (31.5 in)
Y-Axis Travel	600 mm (23.6 in)
Z-Axis Travel	400 mm (15.7 in)
Max Spindle Speed	24,000 RPM (42,000 / 60,000 RPM optional)
Spindle Taper	CT 40
Spindle Motor Power	20 kW (26.8 hp)
Table Load Capacity	400 kg (882 lb)
B Axis Swivel	±120°
Rapid Traverse Rate	60 m/min (2,362 ipm)
Positioning Accuracy	< 0.003 mm (< 3 µm)
Machine Base	Granitan mineral cast composite
Drives	Linear motors (all axes)
CNC Control	Röders RMS6 (Siemens Sinumerik optional)
Machine Weight	10,000 kg (22,046 lb)
Manufacturer	Acra
Model	M60

Specifications sourced from machinio.com — verified 2026-03-28

Strengths & Limitations

Strengths

800 mm X-travel handles mid-to-large mold frames and aerospace brackets that would require refixturing on smaller HSC machines
Granitan base and linear motors maintain sub-3-micron positioning accuracy with surface finishes competitive with dedicated jig grinders on hardened steels
60 m/min rapids combined with the RMS6 look-ahead control sustain high feedrates through complex 3D contours without deceleration marks
Spindle options up to 60,000 RPM on the same machine frame allow graphite electrode milling and hard mold finishing without investing in separate platforms

Limitations

At $420K to $650K depending on spindle and options, the RFM800 is priced at the top of the precision 5-axis segment — a significant investment for smaller mold shops
Röders' North American service presence is thin compared to Makino or DMG Mori, which matters when a spindle bearing fails mid-run on a time-critical mold
The 400 kg table load limit rules out heavy tooling plates and large palletized setups common in aerospace production environments

Best For

Mold and die shops cutting large cavity blocks in P20, H13, or D2 hardened to 60 HRC requiring Ra 0.05 µm finish straight off the machine Electrode departments running graphite and copper electrodes at 42,000-60,000 RPM with the full 800 mm travel for large electrode sets Aerospace precision parts manufacturers machining complex 5-axis contours on titanium and aluminum structural components up to 400 kg Tool rooms requiring one machine to handle both graphite roughing and hardened steel finishing without retooling between machine types

Frequently Asked Questions

01 How does the RFM800 compare to the Makino D800Z?

Both are precision HSC machines in the 800 mm travel class targeting mold and die. The Makino D800Z offers a stronger North American dealer and service network, which matters for shops outside Europe. The Röders RFM800 is favored by European mold shops and is known for the RMS6 control's look-ahead performance in graphite and hardened steel finishing. Surface finish results are comparable at the highest level — the choice often comes down to service coverage and control familiarity.

02 Can the RFM800 handle steel molds and graphite electrodes on the same machine?

Yes. The RFM800 is designed for exactly this dual-purpose use. For steel mold finishing, the 24,000 RPM HSK-A63 spindle provides the torque needed for aggressive stock removal in hardened steels. For graphite electrodes, the 42,000 or 60,000 RPM HSK-E40 spindle delivers the speed needed for clean, burr-free graphite cutting. Röders offers sealed linear way covers and filtration systems for graphite environments.

03 What surface finish can the RFM800 achieve on hardened tool steel?

Under optimal conditions — proper fixturing, correct toolpath strategy, and appropriate cutting parameters — the RFM800 achieves Ra 0.05 to 0.1 µm on hardened H13 and D2 tool steel. This is mirror-class finish that eliminates or dramatically reduces manual polishing time. The Granitan base and linear motors are the two primary contributors to this capability by minimizing vibration and mechanical compliance.

04 What is the delivery and installation timeline for a Röders RFM800?

Lead times for Röders machines typically run 6-12 months from order, depending on spindle specification and configuration. Installation requires a precision-leveled foundation and conditioned shop environment. Röders engineers handle installation and calibration. Training is provided at the factory in Soltau, Germany, or on-site through their dealer network.

05 Is the RFM800 suitable for lights-out machining?

The RFM800 supports automated tool change and can be integrated with pallet handling systems for unattended operation. The linear motor drives have no wear-induced accuracy drift, which is important for maintaining tolerances across unmanned shifts. Most shops running the RFM800 lights-out do so on finishing operations where cycle times are long and tool life is predictable.