Nicolas Correa FOX CNC Boring Mill
Key Specifications
Spindle Taper
Table Size
Spindle Power
spindle diameter
x travel
y travel
Overview
The Nicolas Correa FOX is a CNC bed-type horizontal boring mill from one of Spain's most established machine tool builders, with over 70 years of experience in large-part machining. The FOX's bed-type configuration mounts the workpiece on a fixed or traversing worktable that slides in X while the column headstock travels in Y and Z, combining the geometric rigidity of a bed-type design with the versatility of a full four-axis CNC layout. Available with 110 mm and 130 mm spindle diameters, the FOX targets general contract machining, energy, and mold/die shops requiring a reliable, productive boring mill at a competitive price point relative to the premium floor-type segment.
The FOX headstock is built around a precision spindle cartridge with preloaded angular contact bearings, delivering the radial and axial stiffness required for heavy face milling as well as precision boring. The W-axis quill provides 630 mm of reach without moving the column in Z, useful for deep pockets and stepped bores. Rapid traverse rates of 8,000 mm/min in all linear axes reduce non-cutting time in multi-operation setups. Feed rates are fully programmable, and the machine supports simultaneous 4-axis contouring with X, Y, Z, and B (rotary table) when the optional NC rotary table is fitted.
Correa's approach to thermal compensation is a notable FOX feature: the machine incorporates temperature sensors at critical structural points, and the CNC applies real-time geometric corrections to maintain dimensional accuracy during long production runs. The FOX is compatible with Heidenhain TNC 640 and Fanuc 31i-B5 controls, with Siemens 840D sl available as an option. The tool magazine holds 40 to 60 tools depending on configuration, and Correa offers an automatic boring bar changer for extended unattended operation.
The FOX's bed-type configuration provides inherent stiffness advantages over column-type designs for mid-range workpiece sizes, as the workpiece support structure remains rigid regardless of table position. Correa backs the FOX with a strong European service network and competitive spare parts availability, making it a practical choice for shops seeking a proven boring mill platform with lower total cost of ownership than premium large-format alternatives.
Full Specifications
| Parameter | Value |
|---|---|
| Spindle Diameter | 110 mm or 130 mm (4.3 or 5.1 in) |
| X Travel | 1,500 – 6,000 mm (59.1 – 236.2 in) |
| Y Travel | 1,250 – 2,500 mm (49.2 – 98.4 in) |
| Z Travel | 1,000 – 1,500 mm (39.4 – 59.1 in) |
| W Axis Quill Travel | 630 mm (24.8 in) |
| Spindle Speed Range | 4 – 3,000 rpm |
| Spindle Taper | ISO 50 (BT50) |
| Spindle Motor Power | 30 kW (40 hp) continuous |
| Table Size | 1,000 x 1,000 mm to 2,500 x 2,500 mm |
| Rotary Table | Optional NC rotary B-axis, full 360° |
| Table Load Capacity | Up to 15,000 kg (33,069 lb) |
| Control System | Heidenhain TNC 640, Fanuc 31i-B5, or Siemens 840D sl |
| Tool Magazine | 40 – 60 tools |
| Machine Weight | Approx. 25,000 – 70,000 kg depending on configuration |
| Quantit | -+ |
Strengths & Limitations
Strengths
- Bed-type configuration delivers outstanding structural rigidity for mid-range workpiece sizes, reducing chatter in heavy milling operations
- Broad control choice (Heidenhain, Fanuc, or Siemens) ensures compatibility with existing CAM post-processors and operator training
- Real-time thermal compensation system maintains geometric accuracy during extended production runs without manual re-measurement
- Competitive price point among European boring mill builders while maintaining Spanish manufacturing quality and service network
Limitations
- Maximum table load of 15,000 kg limits the FOX to medium-scale components; larger parts require floor-type configurations
- 30 kW spindle power is adequate but trails premium competitors offering 45+ kW for the most aggressive roughing operations
- Smaller tool magazine capacity (40–60 tools) than comparable floor-type machines may require additional tool changes on complex parts
Best For
Frequently Asked Questions
01
In a bed-type boring mill like the FOX, the workpiece table moves in X while the headstock column moves in Y and Z. The bed provides a rigid fixed reference for the worktable. In a table-type machine, the rotary table moves in X on a cross-slide, providing more flexible positioning but with the table overhang varying with position. Bed-type machines generally offer better rigidity for heavier cuts on larger workpieces.
02
The FOX in standard configuration supports 4-axis machining (X, Y, Z linear plus B rotary table). 5-axis capability requires an optional 2-axis swiveling head or tilting-rotary table attachment. Contact Nicolas Correa or their distributor for 5-axis configuration availability on the FOX platform.
03
The FOX incorporates multiple temperature sensors at structural points including the column, headstock, and bed. The CNC continuously reads these sensors and applies geometric correction offsets in real time to compensate for thermal growth. This maintains positional accuracy during long production runs without requiring the operator to pause and re-measure reference points.
Videos
Nicolas Correa SA
Nicolas Correa SA
Nicolas Correa SA
Nicolas Correa SA
Nicolas Correa SA
Community Discussions
Owner experience and review — Milling a deep bore? : r/Machinists - RedditWho are the CNC youtubers you would recommend to watch?Line Boring. : r/Machinists - RedditProblems with boring head repeatability between parts.Home made, Horizontal- Magnetic- Boring mill... : r/machiningAny good YouTube cha
Community discussion — Who are the CNC youtubers you would recommend to watch?
Community discussion — Line Boring. : r/Machinists - Reddit
Troubleshooting and problem-solving — Problems with boring head repeatability between parts.
Links to community discussions. Summaries are editorial — visit the original thread for full context.
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