Juaristi FX Floor-Type CNC Boring Mill

$1,200,000 – $4,000,000 Updated 2026-03-17

Key Specifications

Spindle Taper

ISO 50 (BT50)

Spindle Power

45 kW (60 hp) continuous

spindle diameter

130 mm or 160 mm (5.1 or 6.3 in)

x travel

4,000 – 20,000 mm (157.5 – 787.4 in) on customer-specified rail length

y travel

2,000 – 5,000 mm (78.7 – 196.9 in)

z travel

1,500 – 3,000 mm (59.1 – 118.1 in)

Overview

The Juaristi FX is a floor-type (plano-type) CNC horizontal boring mill designed for the heaviest large-part machining applications where workpiece size or weight precludes mounting on a conventional table. In the floor-type configuration, the workpiece rests directly on a precision floor plate or T-slot floor, and the machine column travels on floor-mounted X-axis rails while the headstock traverses in Y and Z. This arrangement allows the FX to machine components of virtually unlimited size in X — from large turbine casings and ship engine blocks to wind turbine hubs and mining equipment frames — with a spindle diameter of 130 mm or 160 mm.

The FX column is fabricated from high-quality cast iron with internal ribbing optimized by finite element analysis to maximize stiffness-to-weight ratio. The headstock incorporates a W-axis quill with up to 800 mm of travel, extending boring reach for deep cavities without tool changes. Spindle speeds cover a range from 2 to 2,000 rpm, with maximum spindle power of 45 kW ensuring sufficient torque at low RPM for large-diameter boring heads with multiple insert cartridges. A high-speed version is optionally available for operations requiring faster surface speeds in aluminum alloys.

Juaristi equips the FX with a fully programmable facing slide (U-axis) on the spindle nose, enabling contouring and profiling operations — such as taper boring, facing, and back-boring — without special tooling. The U-axis is driven by a servo motor through a precision gearbox integrated into the spindle cartridge, and it is fully controlled by the Heidenhain TNC 640 or Siemens 840D sl CNC. Rotary table options include floor-mounted NC rotary tables with load capacities exceeding 80,000 kg for complete 4-axis work on massive components.

The FX is a specialist machine targeted at heavy industries where individual components can weigh tens of thousands of kilograms and machining tolerances remain stringent. Juaristi supports FX installations with dedicated commissioning engineers, provides certified geometric and volumetric compensation, and offers long-term service agreements that include annual calibration and spindle exchange programs. For shops committed to large-part machining, the FX represents a cornerstone production asset.

Full Specifications

Parameter	Value
Spindle Diameter	130 mm or 160 mm (5.1 or 6.3 in)
X Travel	4,000 – 20,000 mm (157.5 – 787.4 in) on customer-specified rail length
Y Travel	2,000 – 5,000 mm (78.7 – 196.9 in)
Z Travel	1,500 – 3,000 mm (59.1 – 118.1 in)
W Axis Quill Travel	800 mm (31.5 in)
Spindle Speed Range	2 – 2,000 rpm
Spindle Taper	ISO 50 (BT50)
Spindle Motor Power	45 kW (60 hp) continuous
U Axis Facing Slide	Yes, servo-driven, fully CNC programmable
Control System	Heidenhain TNC 640 or Siemens 840D sl
Rotary Table	Optional floor-mounted NC rotary table, up to 80,000 kg load capacity
Tool Magazine	60 – 120 tools (chain-type)
Machine Weight	Approx. 80,000 – 250,000 kg depending on configuration

Strengths & Limitations

Strengths

Floor-type configuration accommodates workpieces of virtually unlimited X-dimension that cannot be mounted on a table
CNC U-axis facing slide enables taper boring, back-boring, and profiling without special manual tooling setups
160 mm spindle diameter and 45 kW spindle power deliver high torque for large-diameter boring with multi-insert boring heads
Floor-mounted rotary tables with up to 80,000 kg load capacity support 4-axis machining of the heaviest industrial components

Limitations

Requires substantial civil engineering investment including precision concrete floor, embedded rails, and chip management trenches
Long X-axis rails demand careful thermal management and periodic volumetric compensation to maintain accuracy along full travel
Extremely high capital cost and 18–24 month lead times for fully specified machines limit buyers to well-capitalized operations

Best For

Power generation OEMs machining large turbine casings, generator frames, and turbine exhaust hoods Shipbuilding and marine engine manufacturers producing large diesel engine blocks and marine gearbox housings Wind energy component suppliers machining nacelle housings, main frames, and hub flanges for multi-MW turbines Mining equipment manufacturers producing mill shells, crusher frames, and large structural weldments requiring multi-face boring

Frequently Asked Questions

01 What is the maximum workpiece size the Juaristi FX can handle?

The FX column travels on floor rails in X, so X-axis workpiece length is limited only by the length of floor rails installed during machine commissioning — configurations up to 20,000 mm in X are available. Y and Z capacity depends on the specific model. Workpiece weight is limited by the floor structure and, if used, the rotary table load rating.

02 What is the U-axis facing slide on the Juaristi FX?

The U-axis is a servo-driven radial slide mounted at the spindle nose that moves a cutting tool radially while the spindle rotates. It is fully CNC-programmable, enabling the machine to perform taper boring, back-boring, large-diameter facing, and contour profiling operations that would otherwise require specialized boring heads or secondary setups. It is controlled as a synchronized axis by the Heidenhain TNC 640 or Siemens 840D sl.

03 How does the Juaristi FX differ from a gantry-type machining center?

The FX is a horizontal boring mill, so the spindle axis is horizontal. This is advantageous for boring operations, as chips fall clear of the bore. Gantry machining centers use a vertical or inclined spindle configuration and are typically better suited for surface milling. The FX also has significantly higher spindle torque and a W-axis quill, making it superior for deep boring and facing operations on large castings.