DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 3100 LS

Est. $420,000 - $580,000 Specs verified 2026-10-02 · dn-solutions.com Updated 2026-10-02

Image: dn-solutions.com, DN Solutions

Key Specifications

Max Spindle

3,000 rpm

Spindle Power

30 kW (40 hp)

Max Turn Length

2,540 mm (100 in)

chuck size

12 in

max turning diameter

660 mm (26 in)

spindle torque

1,203 N·m (887 ft-lb)

How much does the DN Solutions SMX 3100 LS cost?

Estimated price range

Est.$420,000 - $580,000

Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from DN Solutions. Configuration moves it a long way.

Overview

The DN Solutions SMX 3100 LS pairs the 2,540 mm (100 in) long bed of the SMX range with a second spindle. The main spindle carries a 12 in chuck and is listed at 3,000 rpm, 30 kW (40 hp) and 1,203 N·m (887 ft-lb); the sub-spindle at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb). Maximum turning diameter is 660 mm (26 in).

The two spindles are not twins. Power is equal, but the sub-spindle trades torque for speed: about 40% less torque and a third more rpm. Its figures match the main spindle of the SMX 2600, DN's 10 in chuck model, at 4,000 rpm and 724 N·m (534 ft-lb). So plan heavy stock removal on the main side and leave the transferred end for lighter cuts, finishing and smaller diameters.

On long work a second spindle is useful for more than the back-face operation, because gripping the far end of a shaft is a common way to support it. Whether this machine can hold one workpiece in both spindles at the full 2,540 mm (100 in) is a question for DN, since the table gives turning length only and no distance between spindle noses.

The sub-spindle adds little to the installation. The SMX 3100 L, without it, weighs 20,100 kg (44,313 lb); the LS weighs 20,500 kg (45,195 lb) on a footprint of 7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in). DN's series description covers B-axis and C-axis control at 0.0001 degree, a front tool magazine with an ATC operation panel, and a 12-station servo turret, though the table has no turret row for this model.

Full Specifications

Parameter	Value
Chuck Size	12 in
Max Turning Diameter	660 mm (26 in)
Max Turning Length	2,540 mm (100 in)
Max Spindle Speed	3,000 rpm
Spindle Motor Power	30 kW (40 hp)
Spindle Torque	1,203 N·m (887 ft-lb)
Sub Spindle Speed	4,000 rpm
Sub Spindle Power	30 kW (40 hp)
Sub Spindle Torque	724 N·m (534 ft-lb)
Floor Space Required	7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in)
Machine Weight	20,500 kg (45,195 lb)

Specifications sourced from dn-solutions.com — verified 2026-10-02

Strengths & Limitations

Strengths

Sub-spindle rated 30 kW (40 hp), the same power as the main spindle, with a higher 4,000 rpm limit
2,540 mm (100 in) turning length combined with machining of both ends in one machine
Main spindle torque of 1,203 N·m (887 ft-lb) for roughing on a 12 in chuck
Adds a second spindle to the SMX 3100 L for a weight of 20,500 kg (45,195 lb) against 20,100 kg (44,313 lb)
B-axis and C-axis controlled to 0.0001 degree according to DN's series description

Limitations

Sub-spindle torque is 724 N·m (534 ft-lb), about 40% below the main spindle, so heavy cuts belong on the first side
The main spindle is limited to 3,000 rpm, so small-diameter work on the first side runs below its ideal surface speed
Needs a 7,200 mm (283 in) long space and a floor that carries 20,500 kg (45,195 lb) plus the workpiece
DN's table does not state the sub-spindle chuck size, the distance between spindles or any steady rest provision

Best For

Long shafts machined complete on both ends without a second machine Parts up to 2,540 mm (100 in) that need heavy roughing first and lighter finishing after transfer Mixed work: 660 mm (26 in) chuck parts on the main spindle, smaller diameters at 4,000 rpm on the sub-spindle Shaft work with milled features placed by the B-axis and C-axis

Frequently Asked Questions

01 How do the main and sub-spindle of the SMX 3100 LS differ?

Both are rated 30 kW (40 hp). The main spindle has a 12 in chuck, a 3,000 rpm limit and 1,203 N·m (887 ft-lb). The sub-spindle runs to 4,000 rpm with 724 N·m (534 ft-lb). In practice the main spindle is the roughing side and the sub-spindle is suited to finishing, smaller diameters and back-end features.

02 What is the difference between the SMX 3100 LS and the SMX 3100 L?

The sub-spindle. The SMX 3100 L has the same 2,540 mm (100 in) turning length, 660 mm (26 in) turning diameter and main spindle, but its table has no sub-spindle rows. The LS lists a second spindle at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb) and weighs 20,500 kg (45,195 lb), compared with 20,100 kg (44,313 lb) for the SMX 3100 L. The footprint figures are the same.

03 Can the SMX 3100 LS hold a shaft in both spindles at once?

DN's comparison table does not answer that. It gives a maximum turning length of 2,540 mm (100 in) but no distance between the spindle noses and no sub-spindle travel. If your process depends on gripping both ends, for support or for cutting off between spindles, give DN the part length and ask them to confirm it.

04 Should I buy the SMX 3100 LS or the shorter SMX 3100 S?

They list the same two spindles. The SMX 3100 S turns 1,540 mm (61 in) and weighs 16,700 kg (36,817 lb); the SMX 3100 LS turns 2,540 mm (100 in) and weighs 20,500 kg (45,195 lb), with a 7,200 mm (283 in) long footprint. Buy the length your longest regular part needs, because the long bed takes up floor space on every job, long or short.

05 What should I check before installing an SMX 3100 LS?

Floor loading for 20,500 kg (45,195 lb) of machine plus the heaviest part, and a clear length for the 7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in) footprint with room to load long stock. The tool magazine is at the front, so keep that side open. Electrical and air requirements are not in DN's table.