DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 3100

Est. $300,000 - $420,000 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

1,540 mm (61 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 cost?

Estimated price range

Est.$300,000 - $420,000

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 is the 12 in chuck, single-spindle member of the SMX mill-turn family. It turns up to 660 mm (26 in) in diameter and 1,540 mm (61 in) in length, with a 3,000 rpm spindle rated 30 kW (40 hp) and 1,203 N·m (887 ft-lb).

Those last two figures explain the model. The SMX 2600 shares the envelope and the 30 kW (40 hp) rating but has a 10 in chuck, 4,000 rpm and 724 N·m (534 ft-lb). Against the SMX 2600, the SMX 3100 gives up a quarter of the top speed and returns about 66% more torque from the same power. That is the right trade once parts get large enough that the cut, not the rpm, sets the cycle. On a part near the 660 mm (26 in) limit, 3,000 rpm is never reached; on small bar work it can be the ceiling.

There is no sub-spindle row in DN's table for this model. The SMX 3100 S adds one, listed at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb), and weighs 16,700 kg (36,817 lb) against this machine's 16,300 kg (35,935 lb). If parts come off complete from one chucking, or the back end is done elsewhere, the base model is the simpler machine. For shafts, the SMX 3100 L stretches turning length to 2,540 mm (100 in).

DN describes the series as an orthogonal-structure machine with B-axis and C-axis control to 0.0001 degree, thermal compensation for the spindle and feed axes, and a tool magazine at the front with its own ATC operation panel. The table gives a footprint of 5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in), height last. It does not give milling spindle, magazine capacity or travel figures, so those have to come from DN.

Full Specifications

Parameter	Value
Chuck Size	12 in
Max Turning Diameter	660 mm (26 in)
Max Turning Length	1,540 mm (61 in)
Max Spindle Speed	3,000 rpm
Spindle Motor Power	30 kW (40 hp)
Spindle Torque	1,203 N·m (887 ft-lb)
Floor Space Required	5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in)
Machine Weight	16,300 kg (35,935 lb)

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

Strengths & Limitations

Strengths

1,203 N·m (887 ft-lb) of spindle torque from 30 kW (40 hp), about 66% more than the 724 N·m (534 ft-lb) of the SMX 2600
12 in chuck on a 660 mm (26 in) turning diameter and 1,540 mm (61 in) turning length
Lightest of the SMX 3100 variants at 16,300 kg (35,935 lb); the SMX 3100 L is 20,100 kg (44,313 lb)
B-axis and C-axis with 0.0001-degree control in DN's series description, for milling and drilling at compound angles
Thermal compensation and cooling of the spindle and feed axes are described for the series, aimed at holding size over long runs

Limitations

Top speed is 3,000 rpm, a quarter below the 4,000 rpm of the SMX 2600, which limits surface speed on small diameters
No sub-spindle is listed for this model; second-side work in the same machine needs the SMX 3100 S
Turning length stops at 1,540 mm (61 in); longer shafts need the SMX 3100 L at 2,540 mm (100 in)
DN's table for the SMX 3100 gives no milling spindle, tool magazine or axis travel figures to plan milling work from

Best For

Chuck work up to 660 mm (26 in) where torque matters more than rpm Parts completed from one chucking, with milled and drilled features added by the B-axis and C-axis Shafts and housings within 1,540 mm (61 in) of turning length Shops that do not need a sub-spindle and want the lightest SMX 3100 at 16,300 kg (35,935 lb)

Frequently Asked Questions

01 What is the difference between the SMX 3100 and the SMX 2600?

Chuck size, speed and torque. The SMX 3100 has a 12 in chuck, 3,000 rpm and 1,203 N·m (887 ft-lb). The SMX 2600 has a 10 in chuck, 4,000 rpm and 724 N·m (534 ft-lb). Both are rated 30 kW (40 hp) and share the 660 mm (26 in) turning diameter and 1,540 mm (61 in) turning length. The SMX 3100 weighs 16,300 kg (35,935 lb) and the SMX 2600 15,800 kg (34,833 lb).

02 Does the SMX 3100 have a sub-spindle?

DN's table for the SMX 3100 lists one spindle only. The SMX 3100 S is the version with a sub-spindle, listed at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb). Its turning diameter, turning length and main spindle figures are the same as the base model.

03 How large a part can the SMX 3100 turn?

Up to 660 mm (26 in) in diameter and 1,540 mm (61 in) long, held in a 12 in chuck. The maximum diameter is more than twice the chuck size, so large-diameter parts need suitable jaws or fixtures and a check of gripping force for the cut. For longer work, the SMX 3100 L has a 2,540 mm (100 in) turning length.

04 Is 3,000 rpm fast enough for this size of machine?

For most work at this diameter, yes. Cutting speed depends on diameter, and on parts approaching the 660 mm (26 in) limit the spindle will run far below 3,000 rpm. The limit shows on small diameters and small bar, where the SMX 2600 and its 4,000 rpm spindle are the better fit. The 3,000 rpm spindle exists to deliver 1,203 N·m (887 ft-lb) from 30 kW (40 hp).

05 What does the SMX 3100 need on the shop floor?

DN lists a footprint of 5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in) and a weight of 16,300 kg (35,935 lb). The series has its tool magazine at the front with a separate ATC operation panel, so keep the front of the machine clear for tool loading. Power, air and coolant requirements are not in the table and need to come from DN.