DN Solutions SMX 3100 ST

$420,000 - $580,000 Updated 2026-03-19

Key Specifications

Max Turn Length

1540 mm

max turning diameter

660 mm

chuck size left

12 in

left spindle speed

3,000 RPM

left spindle power

30 kW (40 hp)

left spindle torque

1,300 Nm (959 ft-lbs)

Overview

The DN Solutions SMX 3100 ST is the top-spec standard-bed configuration of the SMX 3100 — 12-inch chuck, sub spindle, and lower turret for simultaneous machining. It represents the maximum productivity you can get from the 3100 platform without going to the long-bed variants, and it's one of the most capable multi-tasking machines in DN Solutions' entire lineup.

The left spindle drives a 12-inch chuck at 3,000 RPM with 30 kW (40 hp) and 1,300 Nm (959 ft-lbs) — slightly higher torque than the S variant's 1,203 Nm, reflecting the gearing optimization for the ST configuration. The right sub spindle runs at 4,000 RPM with 30 kW and 724 Nm. The B-axis milling head hits 12,000 RPM with Capto C6, and the lower turret adds its own set of turning and live tools for parallel processing.

Max turning diameter is 660 mm (26 in) across 1,540 mm (60.6 in) of turning length. At 18,500 kg (40,786 lb), the ST is roughly 1,800 kg heavier than the S variant — that's the lower turret and its drives. The footprint expands slightly to 5,790 x 3,021 x 2,820 mm.

The simultaneous machining capability is where the ST earns its premium. While the B-axis head mills cross-holes or contours an angular feature, the lower turret can rough turn or groove on a different section of the part. On parts with significant turning and milling content, this parallel processing cuts 20-40% off cycle times compared to the sequential processing on the S variant.

The FANUC 31i-B5 control manages multi-channel programming for all this complexity. You'll need experienced programmers and verified CAM posts with collision simulation — the ST is not a machine for beginners. But for production shops running complex parts at volume, the throughput gains are compelling.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm
Max Turning Length	1540 mm
Chuck Size Left	12 in
Left Spindle Speed	3,000 RPM
Left Spindle Power	30 kW (40 hp)
Left Spindle Torque	1,300 Nm (959 ft-lbs)
Right Spindle Speed	4,000 RPM
Right Spindle Power	30 kW (40 hp)
Right Spindle Torque	724 Nm (534 ft-lbs)
Milling Spindle Speed	12,000 RPM
Milling Spindle Taper	Capto C6
B Axis Range	240° (+/-120°)
Lower Turret	Yes (live tooling)
Machine Weight	18,500 kg (40,786 lb)
Machine Dimensions	5,790 x 3,021 x 2,820 mm
CNC Control	FANUC 31i-B5 with CUFOS
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

Simultaneous machining with lower turret and B-axis head delivers 20-40% cycle time reduction on complex parts
12-inch chuck with 1,300 Nm torque handles the heaviest roughing in the SMX 3100 family
Sub spindle at 4,000 RPM and 30 kW enables complete back-working for true done-in-one production
B-axis milling at 12,000 RPM with Capto C6 provides genuine 5-axis machining center capability
Lower turret with live tooling adds independent drilling, tapping, and milling for parallel operations
Significant price advantage over Mazak Integrex i-400ST and DMG Mori CTX gamma 2000 TC

Limitations

Multi-channel simultaneous programming is complex and requires experienced operators with verified CAM posts
18,500 kg machine weight requires reinforced foundation — check floor loading capacity carefully
3,000 RPM main spindle limits SFM on small-diameter turning compared to faster 2100-series machines
Highest price in the standard-bed SMX 3100 family — the lower turret adds $60-80K over the S
Slightly larger footprint than the S variant due to lower turret assembly

Best For

High-volume production shops running complex parts where simultaneous machining cycle time savings pay for the premium Aerospace manufacturers producing large structural components, housings, and landing gear parts at production rates Oil and gas shops machining valve bodies, manifolds, and heavy fittings with both turning and milling features Power generation shops running turbine components that need heavy turning and precision milling in one setup Shops upgrading from the SMX 3100 S or SMX 2600 ST seeking maximum throughput on the 12-inch platform

Frequently Asked Questions

01 What does a new SMX 3100 ST cost?

New machines price between $420,000 and $580,000. The lower turret adds $60-80K over the S variant. Loaded configs with high-pressure coolant, probing, expanded 80-120 tool ATC, and chip management hit the top of the range. Used Doosan PUMA SMX 3100ST machines trade between $220,000 and $380,000.

02 Why does the ST have more torque than the S variant?

The left spindle on the ST delivers 1,300 Nm vs 1,203 Nm on the S. This is a gearing optimization for the ST configuration — with the lower turret handling lighter turning ops simultaneously, the main spindle can be geared for maximum torque on heavier cuts. Both run 30 kW.

03 How does the SMX 3100 ST compare to the SMX 2600 ST?

The 3100 ST steps up to a 12-inch chuck (vs 10-inch), 1,300 Nm torque (vs 690 Nm), and 660 mm turning diameter. Both have 1,540 mm turning length and similar feature sets. The 3100 ST is the right choice when you need the bigger chuck and more torque for heavier parts. It costs roughly $40-60K more.

04 What CAM software works best for the SMX 3100 ST?

Esprit and GibbsCAM have the most mature multi-tasking support for DN Solutions machines. Mastercam with the mill-turn module and verified post also works. You'll want VERICUT or equivalent for collision simulation before running simultaneous operations — it's not optional, it's essential.