DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 3100 S

Est. $360,000 - $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 3100 S cost?

Estimated price range

Est.$360,000 - $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 3100 S is the SMX 3100 with a sub-spindle added. Turning capacity is 660 mm (26 in) in diameter and 1,540 mm (61 in) in length behind a 12 in chuck, and the second spindle is listed at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb).

What the S adds can be read straight from DN's table, because nothing else moves. The SMX 3100 and the SMX 3100 S share a 5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in) footprint, and the weight goes from 16,300 kg (35,935 lb) on the SMX 3100 to 16,700 kg (36,817 lb). The main spindle is unchanged at 3,000 rpm, 30 kW (40 hp) and 1,203 N·m (887 ft-lb). A second spindle that needs no extra floor space is an easy case to make if any share of the work has features on the back face.

The sub-spindle is the lighter of the two. It has the same power but about 40% less torque, and it spins a third faster. That suits the usual division of labour: rough and turn the major diameters on the main spindle, transfer, then face, bore and finish the cut-off side at higher speed. A part that needs equally heavy cuts from both ends is a poor match for this split.

For milled features, DN describes B-axis and C-axis control to 0.0001 degree across the series, and a front-mounted tool magazine with its own ATC operation panel. Tool capacity and milling spindle data are not in the table. DN also lists an SMX 3100ST at 18,500 kg (40,786 lb) with the same spindle figures as the S. The series text mentions a 12-station servo turret, so ask DN how the two variants differ in equipment.

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	5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in)
Machine Weight	16,700 kg (36,817 lb)

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

Strengths & Limitations

Strengths

Sub-spindle with the full 30 kW (40 hp) of the main spindle and a 4,000 rpm top speed
Same 5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in) footprint as the single-spindle SMX 3100
Main spindle keeps 1,203 N·m (887 ft-lb) for first-side roughing in a 12 in chuck
Both sides of a part finished in one cycle, with B-axis and C-axis positioning described to 0.0001 degree
At 16,700 kg (36,817 lb) it is lighter than the SMX 3100ST, listed at 18,500 kg (40,786 lb)

Limitations

Sub-spindle torque is 724 N·m (534 ft-lb) against 1,203 N·m (887 ft-lb) on the main spindle
Turning length is 1,540 mm (61 in); the SMX 3100 LS offers 2,540 mm (100 in) with the same spindles
The main spindle tops out at 3,000 rpm, slower than its own sub-spindle
No milling spindle, tool magazine or bar capacity figures in DN's table for this model

Best For

Chucked parts up to 660 mm (26 in) needing work on both faces Bar and shaft parts within 1,540 mm (61 in) that are cut off and finished on the second spindle Jobs where second-side work is lighter than first-side roughing Shops adding done-in-one capability without a larger footprint than the SMX 3100

Frequently Asked Questions

01 What does the S add to the SMX 3100?

A sub-spindle, listed at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb). According to DN's table, turning diameter, turning length, main spindle and footprint are the same as the SMX 3100. Weight is 16,700 kg (36,817 lb) for the SMX 3100 S and 16,300 kg (35,935 lb) for the SMX 3100.

02 Is the sub-spindle of the SMX 3100 S as strong as the main spindle?

In power, yes: both are 30 kW (40 hp). In torque, no. The main spindle delivers 1,203 N·m (887 ft-lb) up to 3,000 rpm, the sub-spindle 724 N·m (534 ft-lb) up to 4,000 rpm. Put the heavy roughing on the main side and use the sub-spindle for facing, boring, finishing and small diameters.

03 What size chuck does the sub-spindle take?

DN's table gives 12 in for the chuck size and does not state a separate figure for the sub-spindle. Its speed and torque, 4,000 rpm and 724 N·m (534 ft-lb), are the same as the main spindle of the SMX 2600, which DN lists with a 10 in chuck. Treat that as a hint, not a specification, and confirm the sub-spindle chuck with DN.

04 How does the SMX 3100 S compare with the SMX 3100ST?

The spindle rows are identical: 3,000 rpm and 1,203 N·m (887 ft-lb) on the main spindle, 4,000 rpm and 724 N·m (534 ft-lb) on the sub-spindle. The SMX 3100ST is heavier at 18,500 kg (40,786 lb) against 16,700 kg (36,817 lb), and its footprint is 5,790 × 3,021 × 2,820 mm (228 × 119 × 111 in). The table does not say what equipment accounts for the difference, so ask DN.

05 How much space does the SMX 3100 S need?

5,700 × 3,011 × 2,761 mm (224 × 119 × 109 in), listed as length, width and height, with a machine weight of 16,700 kg (36,817 lb). The swivelling operation panel moves side to side, which helps when setting up at the sub-spindle end. Allow service access beyond the listed outline.