GF Mikron MILL P 500
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
Overview
The GF Mikron MILL P 500 is GF Machining Solutions' performance-class vertical machining center, designed for shops that demand the absolute tightest tolerances and best surface finishes in 3-axis mold and die work. The P stands for Performance, and that translates to enhanced thermal management, superior accuracy retention over long cycles, and the same 42,000 RPM Step-Tec spindle technology that defines the Mikron high-speed milling DNA. Travel is 500 x 450 x 350 mm (19.7 x 17.7 x 13.8 in) with a 600 x 500 mm (23.6 x 19.7 in) T-slot table.
What separates the P 500 from the S 500 is the degree of thermal control. The machine achieves ±4 micron precision over extended machining cycles — not just for an hour, but through 24-hour unattended runs. GF accomplishes this through active temperature monitoring and compensation across the spindle, machine structure, and ambient environment. For shops producing mold cavities where every micron of form error shows up in the molded part, this level of stability is not optional.
The 42,000 RPM HSK-E40 Step-Tec spindle delivers 13.5 kW and 8.8 Nm of torque, making this a dedicated finishing and semi-finishing platform. Surface finishes of Ra 0.1 micron are standard capability on hardened steel, which means fewer polishing hours in the tool room. The 30 m/min (1,181 ipm) feed rate and Fanuc 31iB control (Heidenhain TNC 7 also available) provide the block processing speed and path accuracy needed for complex 3D surface machining.
The tool magazine offers 30 or 60 pockets, and the machine supports System 3R pallet automation for lights-out production. The polymer granite base provides the vibration damping foundation that makes the entire high-speed, high-precision package work. Without that damping, you'd never achieve these surface finishes at 42,000 RPM.
New MILL P 500 machines typically run $280,000 to $380,000 depending on control choice, tool magazine, and automation options. The P 500 competes with the Makino F5, Yasda YBM Vi40, and Roku-Roku RMX-5 in the ultra-precision mold finishing segment.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 500 mm (19.7 in) |
| Y-Axis Travel | 450 mm (17.7 in) |
| Z-Axis Travel | 350 mm (13.8 in) |
| Max Spindle Speed | 42,000 RPM |
| Spindle Taper | HSK-E40 |
| Spindle Motor Power | 13.5 kW (18 hp) |
| Spindle Torque | 8.8 Nm (6.5 ft-lb) |
| Tool Capacity | 30 / 60 pockets |
| Table Size | 600 x 500 mm (23.6 x 19.7 in) |
| Max Work Weight | 300 kg (661 lb) |
| Rapid Traverse Rate | 30 m/min (1,181 ipm) |
| Feed Rate | 30 m/min (1,181 ipm) |
| Surface Finish | Ra 0.1 µm achievable |
| Thermal Accuracy | ±4 µm over 24-hour cycle |
| CNC Control | Fanuc 31iB / Heidenhain TNC 7 |
| Machine Weight | 6,500 kg (14,330 lb) |
| Machine Base | Polymer granite |
| Travel X Y Z | 500 x 450 x 350 mm |
| Feed Rate X Y Z | 30 m/min |
| Working Table | T-slot table 600 x 500 mm |
| Table Load Capacity | 300 kg |
| Working Spindle | 42'000 rpm - HSK-E40 |
| Automation | Pallet magazine 5 pallets DelphinSystem 3R Workpartner 1+ and Transformer WorkMaster |
Specifications sourced from gfms.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Industry-leading thermal stability maintains ±4 µm precision over 24-hour unattended cycles, reducing scrap on high-value mold components
- 42,000 RPM Step-Tec spindle achieves Ra 0.1 µm surface finishes on hardened steel, significantly reducing downstream polishing time
- Polymer granite machine base provides exceptional vibration damping essential for achieving consistent micro-finish quality at high spindle speeds
- Active thermal compensation system monitors spindle, structure, and ambient temperatures with continuous real-time correction
- Choice of Fanuc 31iB or Heidenhain TNC 7 control lets shops match their preferred programming ecosystem
Limitations
- HSK-E40 taper and 8.8 Nm torque severely limit roughing capability — a separate roughing machine is typically needed
- 500 x 450 mm envelope restricts this to smaller mold inserts and components; larger work requires the P 900
- Premium pricing at $280K-$380K puts this well above conventional VMCs, though the accuracy justifies the investment for precision work
- 300 kg max workpiece weight limits the size and material of parts that can be fixtured
- GF's North American service presence is smaller than major Japanese and American builders
Best For
Frequently Asked Questions
01
New MILL P 500 machines typically price between $280,000 and $380,000 depending on control choice (Fanuc vs Heidenhain), tool magazine size (30 vs 60 pockets), probing, and automation. The P 500 commands a 10-15% premium over the S 500 due to enhanced thermal management and accuracy features. Used machines from 2015-2020 trade between $120,000 and $220,000.
02
Both share the same work envelope and 42,000 RPM Step-Tec spindle. The P 500 adds enhanced thermal management with active compensation across more monitoring points, achieving tighter accuracy retention over long machining cycles. The S 500 prioritizes speed and productivity; the P 500 prioritizes absolute precision. For most mold shops, the S 500 is sufficient. The P 500 is for applications where every micron matters.
03
In many cases, yes. The Ra 0.1 µm surface finish capability on hardened steel significantly reduces or eliminates hand polishing on mold cavities. For mirror-finish optical molds requiring Ra 0.05 µm or better, some polishing is still needed, but the machine dramatically reduces the time and skill required. This polishing reduction is often the primary ROI justification for the P 500's premium price.
04
Both deliver excellent results on the MILL P 500. Heidenhain TNC 7 is preferred for shops doing extensive 3D surface work and 5-axis programming (if you also run Mikron U-series machines). Fanuc 31iB is the better choice if your shop standardizes on Fanuc controls or uses CAM systems optimized for Fanuc post-processors. Performance differences are minimal — it's mostly about operator familiarity and shop standardization.
05
The MILL P 500 uses multiple temperature sensors throughout the machine structure, spindle, and work area. These sensors feed data to the CNC, which applies real-time positional corrections to compensate for thermal growth. The system monitors ambient shop temperature changes as well, so accuracy is maintained even in shops without tight climate control. This is what enables the ±4 µm specification over 24-hour cycles.
06
Yes, it's excellent for graphite work. The high spindle speed, vibration damping, and precision make it one of the best platforms for finishing graphite electrodes. However, graphite machining produces abrasive dust that can damage spindle bearings and way covers. The dedicated Mikron GRAPHITE series includes dust extraction and sealing features specifically for this application.
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