DN Solutions SMX 3100 LS

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

Key Specifications

Max Turn Length

2540 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

1,203 Nm (887 ft-lbs)

Overview

The DN Solutions SMX 3100 LS pairs the long-bed 2,540 mm turning length with a sub spindle, making it one of the most capable multi-tasking machines in the SMX lineup for long-part production. If your parts exceed 1,500 mm and need features on both ends, this is the configuration that eliminates the second setup.

The left spindle drives a 12-inch chuck at 3,000 RPM with 30 kW (40 hp) and 1,203 Nm (887 ft-lbs) of torque. That's the kind of grunt you need for roughing large steel and stainless parts at the 12-inch chuck size. The right sub spindle runs a smaller chuck at 4,000 RPM with 30 kW and 724 Nm — faster and still powerful enough for back-facing, boring, and finish turning on the second end.

Max turning diameter is 660 mm (26 in) across 2,540 mm (100 in). The B-axis milling spindle hits 12,000 RPM with Capto C6 for angular milling and 5-axis contouring. At 20,500 kg (45,194 lb), the LS is about 400 kg heavier than the L variant — that's the sub spindle assembly. The footprint stays at 7,200 x 3,011 x 2,850 mm.

The FANUC 31i-B5 control with CUFOS manages synchronized spindle handoffs for automated part transfer on long parts. The sub spindle grabs the workpiece, the main spindle releases, and the part flips for second-op work — all programmed into the cycle for unattended operation.

The SMX 3100 LS fills a niche that few competitors match well: long-bed multi-tasking with sub spindle at a production-ready price. The Mazak Integrex e-500 and DMG Mori NTX 3000 cover similar territory but at substantially higher price points. For power generation, marine, and oil and gas shops running long cylindrical parts with both-end features, the LS delivers exceptional value.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm
Max Turning Length	2540 mm
Chuck Size Left	12 in
Left Spindle Speed	3,000 RPM
Left Spindle Power	30 kW (40 hp)
Left Spindle Torque	1,203 Nm (887 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°)
Machine Weight	20,500 kg (45,194 lb)
Machine Dimensions	7,200 x 3,011 x 2,850 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

2,540 mm turning length with sub spindle enables complete processing of very long parts on both ends in one cycle
12-inch main chuck with 1,203 Nm torque handles heavy roughing on large-diameter steel and stainless
Sub spindle at 4,000 RPM and 30 kW provides genuine cutting power for second-op work, not a compromise
B-axis milling at 12,000 RPM with 5-axis simultaneous capability covers complex angular features on long parts
20,500 kg mass delivers excellent thermal stability and vibration damping for tight tolerances on heavy work
Strong price advantage over Mazak Integrex e-500 and DMG Mori NTX 3000 long-bed configurations

Limitations

7,200 mm machine length requires significant floor space and careful facility planning
20,500 kg weight demands reinforced foundations — standard shop floors may need upgrades
3,000 RPM main spindle is slow for small-diameter turning compared to lighter, faster platforms
No lower turret — simultaneous machining requires stepping up to the ST variant
Long part transfer between spindles across 2,540 mm adds cycle time vs shorter-bed machines

Best For

Power generation and turbine shops machining long shafts, generator rotors, and pump columns with both-end features Marine manufacturers producing propeller shafts and rudder stocks that need complete multi-tasking in a single setup Oil and gas shops running long downhole assemblies, drill collars, and production tubing components Heavy equipment manufacturers machining hydraulic cylinder rods, rollers, and drive shafts over 1,500 mm Shops that need sub spindle back-working on parts too long for the SMX 2600 S platform

Frequently Asked Questions

01 What does a new SMX 3100 LS cost?

New machines run $420,000 to $580,000 depending on configuration and options. The sub spindle adds $40-60K over the L variant. Fully loaded machines with high-pressure coolant, probing, expanded ATC, and chip conveyor push toward the top of the range.

02 Are the main and sub spindle chucks the same size?

The main spindle typically runs a 12-inch chuck, while the sub spindle usually runs a smaller chuck (often 10-inch). This is common on large mill-turn machines where the sub spindle handles smaller second-op features. Exact chuck size on the sub spindle depends on configuration.

03 How does the SMX 3100 LS compare to the SMX 3100 S?

The LS has 2,540 mm turning length vs 1,540 mm on the S. Both have sub spindles and 12-inch chucks. Choose the LS when your parts exceed 1,540 mm; choose the S for shorter parts where the more compact footprint is an advantage. The LS weighs about 3,800 kg more and costs roughly $60-80K more.

04 Can the SMX 3100 LS handle steady rest operations?

Yes. For long, slender parts that need support during turning, the SMX 3100 LS can be equipped with hydraulic steady rests. These are particularly important on parts over 2,000 mm where L/D ratios would cause chatter without intermediate support.