DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 3100ST

Est. $350,000 - $500,000 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 3100ST cost?

Estimated price range

Est.$350,000 - $500,000

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 3100ST is the heaviest short-bed SMX 3100, at 18,500 kg (40,786 lb). It is a two-spindle mill-turn machine with a 12 in chuck, a 660 mm (26 in) maximum turning diameter and a 1,540 mm (61 in) turning length. The main spindle 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).

Line those rows up against the SMX 3100 S and they match figure for figure. What separates the two in DN's table is the machine itself: the SMX 3100 S weighs 16,700 kg (36,817 lb), and the ST occupies 5,790 × 3,021 × 2,820 mm (228 × 119 × 111 in). DN's series description includes a 12-station servo turret, and that is the obvious candidate for the extra mass. The table has no turret row, though, so treat this as the first question to put to DN and not as a listed specification.

The practical value of a machine like this is overlap. With two spindles of equal power, the first and second operations of a part can run in the same cycle instead of one after the other. The spindles are not identical, however. The sub-spindle gives about 40% less torque and a third more speed than the main spindle, so the heavy roughing belongs on the 12 in side.

The same ST layout exists one size down. The SMX 2600 ST has a 10 in chuck, 4,000 rpm on both spindles and 690 N·m (509 ft-lb) on the main spindle, and weighs 18,000 kg (39,683 lb) on the same footprint. Choosing between them comes down to part diameter and how much torque the first operation needs. Series features include B-axis and C-axis control to 0.0001 degree and thermal compensation for the spindle and feed axes.

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)
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	5,790 × 3,021 × 2,820 mm (228 × 119 × 111 in)
Machine Weight	18,500 kg (40,786 lb)

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

Strengths & Limitations

Strengths

Two spindles at 30 kW (40 hp) each, so both operations can carry real cutting load
1,203 N·m (887 ft-lb) on the main spindle, against 690 N·m (509 ft-lb) on the SMX 2600 ST
660 mm (26 in) turning diameter with a 12 in chuck and 1,540 mm (61 in) of turning length
Series description includes a 12-station servo turret together with B-axis and C-axis control to 0.0001 degree
Thermal compensation and an optimized cooling solution for the spindle and feed axes, per DN's series text

Limitations

At 18,500 kg (40,786 lb) it is heavier than the SMX 3100 S, listed at 16,700 kg (36,817 lb), for the same spindle figures
The sub-spindle delivers 724 N·m (534 ft-lb), about 40% less than the main spindle
Main spindle speed is capped at 3,000 rpm; the SMX 2600 ST reaches 4,000 rpm on both spindles
DN's table does not itemise the turret, milling spindle or tool magazine for this model, so the equipment behind the ST designation has to be confirmed

Best For

Production of chucked parts up to 660 mm (26 in) where both operations run in one machine Work that needs 1,203 N·m (887 ft-lb) on the first side and higher speed on the second Complex turned parts with angled milling by B-axis and C-axis Parts within 1,540 mm (61 in) of turning length

Frequently Asked Questions

01 How is the SMX 3100ST different from the SMX 3100 S?

DN's table gives both the same chuck, turning envelope and spindle data. The differences listed are weight, 18,500 kg (40,786 lb) for the SMX 3100ST against 16,700 kg (36,817 lb) for the SMX 3100 S, and footprint, 5,790 × 3,021 × 2,820 mm (228 × 119 × 111 in) against 5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in) for the SMX 3100 S. The series text mentions a 12-station servo turret; ask DN to confirm which model carries it.

02 What are the spindle ratings of the SMX 3100ST?

Main spindle: 3,000 rpm, 30 kW (40 hp), 1,203 N·m (887 ft-lb), with a 12 in chuck. Sub-spindle: 4,000 rpm, 30 kW (40 hp), 724 N·m (534 ft-lb). The table lists one power figure per spindle and does not say whether it is a continuous or short-time rating.

03 SMX 3100ST or SMX 2600 ST: which fits my parts?

Both list a 660 mm (26 in) turning diameter and 1,540 mm (61 in) turning length. The SMX 2600 ST has a 10 in chuck and 4,000 rpm on both spindles, with 690 N·m (509 ft-lb) on the main spindle. The SMX 3100ST has a 12 in chuck and 1,203 N·m (887 ft-lb) at up to 3,000 rpm. Smaller, faster work points to the SMX 2600 ST; larger diameters and heavier first-side cuts point to the SMX 3100ST.

04 How much does the SMX 3100ST weigh and how big is it?

18,500 kg (40,786 lb), with a footprint of 5,790 × 3,021 × 2,820 mm (228 × 119 × 111 in) given as length, width and height. Check the floor and the rigging route against that weight. The tool magazine sits at the front of the machine with its ATC operation panel, so tools are loaded from the front.

05 Is there a longer version of this machine with a sub-spindle?

Among the SMX 3100 models DN lists, the long-bed one with a sub-spindle is the SMX 3100 LS, which has a 2,540 mm (100 in) turning length and weighs 20,500 kg (45,195 lb). Its main and sub-spindle figures are the same as those of the SMX 3100ST, so the choice between the two is about part length and floor space.