Juaristi MD Series CNC Boring Mill

$800,000 – $2,500,000 Updated 2026-03-17

Key Specifications

Spindle Taper

ISO 50 (BT50)

Table Size

1,250 x 1,250 mm to 3,150 x 3,150 mm

Spindle Power

37 kW (50 hp) continuous

spindle diameter

110 mm – 160 mm (4.3 – 6.3 in)

x travel

2,000 – 8,000 mm (78.7 – 314.9 in) depending on configuration

y travel

1,500 – 3,000 mm (59.1 – 118.1 in)

Overview

The Juaristi MD Series is a high-rigidity CNC table-type horizontal boring mill engineered for the precision machining of large, heavy workpieces in the aerospace, energy, and heavy equipment sectors. Built at Juaristi's manufacturing facility in Bergara, Spain, the MD Series combines a massive cast-iron column and headstock with precision-ground guideways to deliver the structural stiffness required for heavy-duty milling, boring, and drilling operations. Spindle diameters range from 110 mm to 160 mm, and the machine is available in a wide range of table sizes and travel configurations to match specific shop requirements.

The MD Series table-type configuration positions the workpiece on a large rotary table mounted to a cross-slide, giving the operator full four-axis positioning without repositioning the part. The W-axis quill extends from the spindle head for reach into deep bores and cavities, supplementing the X, Y, and Z linear travels. Standard spindle taper is ISO 50 (BT50), with spindle speeds typically ranging from 3 to 2,500 rpm — a wide range that accommodates both large-diameter boring with indexable inserts and high-speed face milling with smaller cutters. The rotary table provides a full 360-degree continuous C-axis for turning and multi-face operations.

Control is provided by Heidenhain TNC or Siemens 840D sl systems, both of which support full 5-axis interpolation when the machine is configured with an optional tilting rotary table. The MD Series features automatic tool change via a drum or chain-type magazine with 40 to 80 tool positions, and an automatic boring bar changer is available for extended unattended operation. Juaristi's in-house spindle design uses precision angular contact bearings and hydrostatic options for the heaviest cuts, ensuring bore roundness and surface finish even under interrupted cutting conditions.

The MD Series is purpose-built for contract machining and production environments where part size and material hardness demand a machine with exceptional thermal stability and geometric accuracy. Juaristi offers comprehensive after-sales support including remote diagnostics, preventive maintenance programs, and geometric calibration services, making the MD Series a long-term investment for shops taking on large structural components in steel, cast iron, and titanium.

Full Specifications

Parameter	Value
Spindle Diameter	110 mm – 160 mm (4.3 – 6.3 in)
X Travel	2,000 – 8,000 mm (78.7 – 314.9 in) depending on configuration
Y Travel	1,500 – 3,000 mm (59.1 – 118.1 in)
Z Travel	1,000 – 2,000 mm (39.4 – 78.7 in)
W Axis Quill Travel	630 mm (24.8 in)
Spindle Speed Range	3 – 2,500 rpm
Spindle Taper	ISO 50 (BT50)
Spindle Motor Power	37 kW (50 hp) continuous
Table Size	1,250 x 1,250 mm to 3,150 x 3,150 mm
Rotary Table	Full 360° C-axis, continuous
Table Load Capacity	Up to 30,000 kg (66,138 lb)
Control System	Heidenhain TNC 640 or Siemens 840D sl
Tool Magazine	40 – 80 tools (drum or chain)
Machine Weight	Approx. 55,000 – 140,000 kg depending on configuration
Producer	Robin Millar

Strengths & Limitations

Strengths

Exceptionally rigid cast-iron construction handles heavy interrupted cuts in steel and cast iron without chatter
Wide spindle diameter range (110–160 mm) and W-axis quill provide versatility for deep-bore and large-diameter operations
Full 360° continuous rotary C-axis enables 4-axis contouring and multi-face machining without part repositioning
Choice of Heidenhain TNC 640 or Siemens 840D sl control supports 5-axis machining with optional tilting table

Limitations

Large footprint and significant machine weight require reinforced foundations and careful facility planning
Lead times for custom table and travel configurations can extend 12–18 months from order
Spanish origin means longer service response times for shops outside Europe without a local Juaristi representative

Best For

Aerospace structural component manufacturers machining large titanium frames and aluminum wing structures Energy sector shops producing turbine casings, valve bodies, and pressure vessel flanges in alloy steel Heavy equipment and mining industry suppliers machining large gear housings, pump bodies, and structural weldments Contract machining shops handling complex multi-face parts requiring 4- and 5-axis interpolation on a single setup

Frequently Asked Questions

01 What is the difference between the Juaristi MD Series and the FX Floor-type boring mill?

The MD Series is a table-type boring mill where the workpiece sits on a movable rotary table and travels in X. The FX is a floor-type (plano-type) configuration where the workpiece sits on the floor or a stationary floor plate and the column travels. Floor-type machines are better suited for extremely large, heavy workpieces that cannot be lifted onto a table. Table-type machines like the MD Series offer faster cycle times for medium-to-large parts requiring full 4-axis positioning.

02 What control systems are available on the Juaristi MD Series?

Juaristi offers the Heidenhain TNC 640 and Siemens 840D sl as standard control options. Both support 5-axis interpolation when paired with an optional tilting rotary table. The choice typically comes down to customer preference and compatibility with existing CAM post-processors in the shop.

03 How much does a Juaristi MD Series CNC boring mill cost?

Pricing for the MD Series ranges from approximately $800,000 to $2,500,000 depending on spindle diameter, table size, travel lengths, and options such as boring bar changers, extended tool magazines, and control configuration. Contact Juaristi or their regional distributor for a formal quotation.