GF Machining Solutions Vertical Machining Centers

GF Mikron MILL S 800

$380,000 - $520,000 Updated 2025-03-15

Key Specifications

X Travel

800 mm (31.5 in)

Y Travel

700 mm (27.6 in)

Z Travel

500 mm (19.7 in)

Max Spindle

42,000 RPM (36,000 RPM option)

Spindle Taper

HSK-E50

Tool Capacity

68 tools (168 optional)

Overview

The GF Mikron MILL S 800 is the flagship of GF Machining Solutions' speed-class vertical milling lineup, delivering the largest work envelope in the S series: 800 x 700 x 500 mm (31.5 x 27.6 x 19.7 in). This machine targets mold shops finishing larger plates and multi-cavity tooling where high spindle speeds and exceptional surface finish quality need to work across a generous work envelope.

The Step-Tec spindle options mirror the S 600, with 36,000 and 42,000 RPM units available in HSK-E50. The 42,000 RPM spindle at 13.5 kW and 8.8 Nm is pure speed — built for micro-diameter finishing cutters on hardened steel, graphite, and copper. The 36,000 RPM alternative with 33 kW and 21 Nm opens the door to semi-finishing and light roughing without sacrificing the ability to deliver mirror-quality surface finishes on the same platform.

Rapid traverse hits 61 m/min (2,402 ipm), maintaining the S series' characteristic urgency in non-cutting moves. The polymer granite base scales to support the larger structure while preserving the vibration damping that makes high-speed finishing possible. The 68-pocket standard tool magazine (expandable to 168) handles complex programs with extensive tooling requirements.

The Heidenhain TNC 7 or Siemens SINUMERIK ONE control provides the processing power and path accuracy needed for complex 3D surface programs on larger mold cavities. Active thermal management maintains accuracy across the bigger structure, and System 3R pallet automation is available for production environments.

New MILL S 800 machines price between $380,000 and $520,000 depending on configuration. The S 800 competes with the Röders RXP 950, Makino F8, and DMG Mori HSC 105 linear in the larger high-speed milling segment. For shops that need Mikron speed-class capability on bigger parts, the S 800 is the top of the line.

Full Specifications

Parameter	Value
X-Axis Travel	800 mm (31.5 in)
Y-Axis Travel	700 mm (27.6 in)
Z-Axis Travel	500 mm (19.7 in)
Max Spindle Speed	42,000 RPM (36,000 RPM option)
Spindle Taper	HSK-E50
Spindle Motor Power	13.5 kW (18 hp) / 33 kW (44 hp) at 36K RPM
Spindle Torque	8.8 Nm (6.5 ft-lb) / 21 Nm (15.5 ft-lb) at 36K RPM
Tool Capacity	68 tools (168 optional)
Table Size	900 x 700 mm (35.4 x 27.6 in)
Max Work Weight	500 kg (1,102 lb)
Rapid Traverse Rate	61 m/min (2,402 ipm)
Feed Rate	30 m/min (1,181 ipm)
CNC Control	Heidenhain TNC 7 / Siemens SINUMERIK ONE
Machine Weight	11,500 kg (25,353 lb)
Machine Base	Polymer granite

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

Strengths & Limitations

Strengths

Largest work envelope in the Mikron S series handles bigger mold plates and multi-cavity tooling at full high-speed milling capability
61 m/min rapid traverse minimizes non-cutting time across the large work envelope
Dual spindle options — 42K RPM for pure finishing or 36K RPM with 21 Nm torque for combined operations
168-pocket expanded tool magazine supports complex multi-tool programs for extended unattended production
Polymer granite base and active thermal management maintain accuracy across the larger machine structure
700 mm Y-axis travel provides significant depth-of-table working area for wider mold plates

Limitations

Premium pricing starting at $380K makes this one of the more expensive VMCs on the market
11,500 kg machine weight requires substantial floor preparation and professional rigging
500 kg max workpiece weight is lower than the E series' 1,000-1,500 kg capacity, limiting heavy plate work
HSK-E50 tooling ecosystem is more limited than HSK-A63 in terms of vendor availability
GF's service network remains smaller than Japanese and American builders in many North American regions

Best For

Large mold finishing operations requiring speed-class surface quality (Ra 0.1 µm) on bigger mold plates Multi-cavity mold shops where complex tooling requires extensive X/Y travel with high-speed finishing capability Automotive and consumer electronics mold finishing on medium to large plates Production electrode manufacturing shops running large multi-electrode setups Shops that need the largest possible Mikron S-series envelope without stepping up to 5-axis Automated high-speed finishing cells using System 3R palletization for lights-out production

Frequently Asked Questions

01 What does a new GF Mikron MILL S 800 cost?

New MILL S 800 machines price between $380,000 and $520,000 depending on spindle, control, tool magazine, and automation packages. As the flagship S series machine, it commands a significant premium over the S 500 and S 600. Used machines from 2016-2021 trade between $160,000 and $320,000 depending on hours and configuration.

02 How does the S 800 compare to the S 600?

The S 800 adds 100mm of Y-axis travel (700 vs 600mm) and offers a larger table (900 x 700 vs 800 x 600mm) with higher workpiece capacity (500 vs 120 kg). The X and Z axis travel are identical at 800 and 500mm. Spindle options and rapid traverse are the same. Choose the S 800 when Y-axis depth and table capacity are critical; the S 600 when the smaller footprint and lower price are more important.

03 Can the S 800 replace a dedicated graphite machine?

For finishing graphite electrodes, yes — the 42,000 RPM spindle and polymer granite damping deliver excellent results. However, graphite produces abrasive dust that accelerates wear on spindle bearings, way covers, and seals. The dedicated Mikron GRAPHITE series includes dust extraction and sealing features specifically designed for graphite environments. If graphite is your primary application, consider the GRAPHITE series.

04 What's the realistic accuracy of the S 800?

With active thermal management and the polymer granite base, the S 800 holds ±5 µm over typical production cycles in a reasonably temperature-controlled shop (±2°C). Surface finishes of Ra 0.1-0.15 µm are consistently achievable on hardened steel. For absolute best accuracy, ensure the shop environment is thermally stable and allow adequate machine warm-up time.

05 How does it compare to the Röders RXP 950?

The Röders RXP 950 uses linear drives for superior acceleration and jerk, giving it an edge on intricate 3D surfaces with tight radii. The Mikron S 800 counters with Step-Tec spindle longevity and the GF automation ecosystem. Both deliver excellent surface finishes. The Röders typically specs slightly better positioning accuracy. Pricing is comparable. Service availability varies by region.