DN Solutions SMX 3100ST

$350,000 - $500,000 Updated 2026-03-11

Key Specifications

Y Travel

300 mm (11.8 in) [+/-150 mm]

Max Turn Length

1540 mm

max turning diameter

660 mm

travel x1

695 mm (27.4 in)

travel z1

1,585 mm (62.4 in)

travel x2

235 mm (9.3 in)

Overview

The DN Solutions SMX 3100ST is a 9-axis multi-tasking beast that packs dual turning spindles, a B-axis milling head, and a 12-station lower turret onto a single platform. Formerly sold as the Doosan PUMA SMX 3100ST, this machine's value proposition is straightforward: you're getting roughly 80% of a Mazak Integrex or DMG Mori CTX beta at 70-75% of the price. For shops that need done-in-one capability without the premium European or Japanese price tag, it's one of the most compelling options on the market.

The main (left) spindle delivers 30 kW (40 hp) and 1,203 Nm (887 ft-lbs) of torque at 3,000 RPM through a 10-12 inch chuck. That's serious grunt for heavy turning operations on steel and titanium. The sub (right) spindle runs 4,000 RPM with 26 kW (35 hp) and 621 Nm (458 ft-lbs), giving you genuine back-working capability rather than a glorified parts catcher. Up top, the B-axis milling spindle hits 12,000 RPM with 26 kW (35 hp) and a Capto C6 taper, swinging through 240 degrees (+/-120 degrees) for full angular access.

You're looking at 660 mm (26 in) max turning diameter and 1,540 mm (60.6 in) max turning length, with 103 mm (4.1 in) bar capacity through the main spindle. The work envelope is generous for aerospace landing gear, oil and gas components, and large medical implant work. Axis travels span 695 mm on X1, 300 mm on Y (+/-150 mm), and 1,585 mm on Z1. Rapids hit 48 m/min on X1 and Z1.

The 80-station ATC with 1.8-second tool-to-tool changes keeps cycle times tight on complex parts. The BMT-KEY lower turret adds 12 more stations with 5,000 RPM live tooling at 7 kW (9.4 hp), so you can run simultaneous cutting operations on both spindles. The whole package runs on a FANUC 31i-B5 with CUFOS dual-path 5-axis simultaneous control and a collision protection system.

At roughly 18,500 kg (40,780 lb), it's a substantial machine that demands proper foundation work. Forum users consistently describe it as "very productive" and "basically both a VMC and a TC on a single base," though some have noted the roller linear guideway construction makes trade-offs in rigidity compared to competitors with box-way designs. B-axis accuracy can require custom macro compensation to hold tolerances under 0.01 mm reliably. New machines price around $350,000-$500,000 depending on configuration, with used examples from 2018-2022 trading between $150,000 and $300,000. Specs sourced from DN Solutions and Ellison Technologies published data.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm
Max Turning Length	1540 mm
Travel X1	695 mm (27.4 in)
Y-Axis Travel	300 mm (11.8 in) [+/-150 mm]
Travel Z1	1,585 mm (62.4 in)
Travel X2	235 mm (9.3 in)
Travel Z2	1,540 mm (60.6 in)
B Axis Range	240° (+/-120°)
Main Spindle Speed	3,000 RPM
Main Spindle Power	30 kW (40 hp) / 1,203 Nm (887 ft-lbs)
Sub Spindle Speed	4,000 RPM
Sub Spindle Power	26 kW (35 hp) / 621 Nm (458 ft-lbs)
Milling Spindle Speed	12,000 RPM
Milling Spindle Power	26 kW (35 hp) / 124 Nm (91 ft-lbs)
Milling Spindle Taper	Capto C6
Chuck Size Main	10-12 in (left spindle)
Chuck Size Sub	8-10 in (right spindle)
Bar Capacity	103 mm (4.1 in)
Tool Capacity Atc	80 tools (1.8 sec tool-to-tool)
Lower Turret	12 stations, BMT-KEY, 5,000 RPM live tooling, 7 kW (9.4 hp)
Rapid Traverse X1 Z1	48 m/min (1,889 ipm)
Rapid Traverse Y	36 m/min (1,417 ipm)
Machine Weight	18,500 kg (40,780 lb)
CNC Control	FANUC 31i-B5 with CUFOS dual-path 5-axis simultaneous
Chuck Size	12 inch
Metric	IMPERIAL
Capacity	Chuck sizeMax. Turning DiameterMax. Turning Length
Left Spindle	Max. Spindle SpeedMax. Spindle PowerMax. Spindle Torque
Right Spindle	Max. Spindle SpeedMax. Spindle PowerMax. Spindle Torque
Dimensions	LengthHeightWidthWeight
Favorites	SMX5100XLB

Specifications sourced from dn-solutions.com — verified 2026-03-28

Strengths & Limitations

Strengths

Dual turning spindles with genuine back-working capability — the 4,000 RPM sub spindle delivers 26 kW (35 hp) and 621 Nm torque, making it a real second operation spindle rather than just a parts catcher
80-station ATC with 1.8-second tool changes keeps complex multi-operation parts cycling fast, and the 12-station BMT lower turret enables simultaneous cutting on both spindles
240-degree B-axis milling spindle at 12,000 RPM with Capto C6 taper provides genuine machining center performance for angular milling, drilling, and tapping operations
9-axis FANUC 31i-B5 control with CUFOS dual-path architecture and collision protection system provides full 5-axis simultaneous capability with built-in safety for complex programming
Significantly lower acquisition cost than comparable Mazak Integrex, DMG Mori CTX, or Okuma Multus machines — roughly 25-30% less for similar capability, making multi-tasking accessible to mid-tier shops
1,540 mm (60.6 in) max turning length handles long aerospace and energy components that won't fit in smaller multi-tasking machines like the Integrex i-200 or CTX beta 1250
103 mm (4.1 in) bar capacity through the main spindle supports bar feeder automation for unattended production of medium-diameter parts

Limitations

Roller linear guideway construction trades some rigidity for speed compared to box-way competitors, and forum users report the Z-Y construction creates accuracy compromises under heavy cutting loads
B-axis accuracy can drift, with users reporting 0.008-0.03 mm Y-axis displacement during B-axis clamping; holding tolerances below 0.01 mm reliably requires custom macro compensation developed in-house
3,000 RPM main spindle is the slowest in this competitive class — the Mazak Integrex i-200 runs 5,000 RPM and the Okuma Multus B250II hits 5,000 RPM, limiting small-diameter high-speed turning work
18,500 kg (40,780 lb) machine weight requires serious floor reinforcement and rigging, and the 5,790 mm (228 in) footprint demands significant floor space
Service network and parts availability trail Mazak and DMG Mori in North America; DN Solutions (formerly Doosan) has fewer factory-trained technicians and regional service centers

Best For

Aerospace shops machining landing gear, structural components, and turbine parts that need turning, milling, and drilling in a single setup with long work envelopes up to 1,540 mm Job shops looking to enter multi-tasking without the $400K-$600K price tag of Japanese and European competitors, where the 25-30% cost savings justifies the trade-offs in rigidity Oil and gas manufacturers running large-diameter valve bodies, connectors, and downhole components with complex OD/ID features, cross-holes, and angular milling operations Production environments running medium-volume parts with bar feeders through the 103 mm bore, leveraging both spindles and the lower turret for simultaneous cutting Medical device and implant manufacturers producing complex multi-feature components where done-in-one processing reduces handling and contamination risk between operations Shops already standardized on FANUC controls that want to add multi-tasking capability without retraining programmers on Mazatrol, OSP, or Siemens platforms

Frequently Asked Questions

01 What does a new DN Solutions SMX 3100ST cost?

New SMX 3100ST machines typically price between $350,000 and $500,000 depending on configuration, options, and dealer. Base machines with standard tooling start around $350K, while fully loaded configs with high-pressure coolant, chip conveyor, and expanded tooling push toward $500K. That's roughly 25-30% less than comparably equipped Mazak Integrex or DMG Mori CTX machines. Used SMX 3100ST machines from 2018-2022 trade between $150,000 and $300,000 depending on hours, condition, and options.

02 How does the SMX 3100ST compare to the Mazak Integrex i-200?

The SMX 3100ST is a larger, more powerful machine with dual spindles and a lower turret that the base Integrex i-200 doesn't have. The SMX offers 660 mm turning diameter vs 658 mm, and 1,540 mm turning length vs 1,011 mm. However, the Integrex runs a faster 5,000 RPM main spindle vs 3,000 RPM on the SMX, and Mazak's box-way construction and roller cam B-axis drive generally deliver better rigidity and accuracy. The SMX wins on value and work envelope; the Integrex wins on precision and spindle speed.

03 Is the B-axis accurate enough for precision work?

Out of the box, the B-axis holds decent accuracy for most production work. However, forum users report that the B-axis moves slightly (around 0.0012 degrees) during clamping, causing Y-axis displacement of 0.008-0.03 mm depending on position. For work requiring tolerances under 0.01 mm, some shops develop custom G400 macro compensation routines that monitor clamp status and servo errors via scales. With these compensations, users report holding +/-0.003 mm across the full B-axis range.

04 What's the difference between the SMX 3100, 3100S, 3100L, and 3100ST?

The base SMX 3100 is a single-spindle machine with B-axis milling. The 3100S adds a sub spindle for back-working. The 3100L is a long-bed variant with extended turning length for long shafts. The 3100ST adds both a sub spindle and a 12-station lower turret with live tooling, giving you maximum flexibility for simultaneous operations. The ST variant is the most capable and most popular configuration for shops doing complex done-in-one work.

05 What CAM software works best with the SMX 3100ST?

The FANUC 31i-B5 control with CUFOS dual-path architecture works well with major CAM systems. DN Solutions provides specifications to major CAM builders, so post processors are available from Mastercam, Esprit, GibbsCAM, and other platforms. The dual-path programming can be complex, and forum users note that getting a reliable post processor for simultaneous upper and lower turret operations takes some iteration. Budget time for post validation and test cutting on the first few jobs.

06 Can the SMX 3100ST run unattended?

Yes. The machine supports automated part unloading with a part ejector, coolant flush, part catcher, and conveyor for unattended operation. The 80-station ATC and 103 mm bar capacity through the main spindle pair well with magazine bar feeders for lights-out production. The FANUC control supports tool life management for extended unmanned runs. The collision protection system adds safety for unattended cycles.