DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 3100 L

Est. $380,000 - $520,000 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 L cost?

Estimated price range

Est.$380,000 - $520,000

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

With a turning length of 2,540 mm (100 in), the DN Solutions SMX 3100 L is the long-bed version of the SMX 3100 mill-turn machine. The rest of the turning data is unchanged: a 12 in chuck, 660 mm (26 in) maximum turning diameter, and a 3,000 rpm spindle with 30 kW (40 hp) and 1,203 N·m (887 ft-lb).

The extra length is bought with floor space and mass. The SMX 3100 turns 1,540 mm (61 in) and weighs 16,300 kg (35,935 lb); the L weighs 20,100 kg (44,313 lb) and its footprint is 7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in). The middle figure, the width, is the same 3,011 mm (119 in) as the SMX 3100, so the long bed changes how much wall the machine takes up and little else about the layout.

A 2,540 mm (100 in) part of modest diameter is a slender part, and slender parts deflect under cutting load. How the work is supported along its length decides what tolerances are realistic. DN's table has no tailstock, steady rest or sub-spindle row for this model, so raise workholding and support with DN at the quoting stage. The SMX 3100 LS is the long-bed variant whose table adds a sub-spindle, at 4,000 rpm and 724 N·m (534 ft-lb).

Milling capability is described at series level: an orthogonal structure, B-axis and C-axis control at 0.0001 degree, and thermal compensation meant to hold accuracy through long cycles, which matters on shaft work where one part can occupy the machine for hours. The operation panel moves side to side, swivels and adjusts in height, a practical point on a machine this long.

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)
Floor Space Required	7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in)
Machine Weight	20,100 kg (44,313 lb)

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

Strengths & Limitations

Strengths

2,540 mm (100 in) turning length, against 1,540 mm (61 in) on the SMX 3100, with the same 660 mm (26 in) turning diameter
1,203 N·m (887 ft-lb) at the spindle for roughing long shafts from solid or forged stock
Machine width stays at 3,011 mm (119 in) despite the longer bed
Operation panel travels side to side, swivels and adjusts in height, so the operator can work at either end of a long part
Series-level thermal compensation for the spindle and feed axes, relevant to the long cycle times of shaft work

Limitations

Footprint grows to 7,200 mm (283 in) in length and weight to 20,100 kg (44,313 lb)
No sub-spindle row for this model; the SMX 3100 LS lists one at 4,000 rpm and 724 N·m (534 ft-lb)
DN's table says nothing about tailstock or steady rest provision, which long slender parts depend on
The 12 in chuck and 3,000 rpm spindle are those of the shorter SMX 3100, so the long bed adds length capacity but no extra diameter, speed or torque

Best For

Shafts, rolls and spindles up to 2,540 mm (100 in) long Long parts that need milled flats, keyways or cross-holes in the same setup as the turning Heavy roughing of long stock with 1,203 N·m (887 ft-lb) available Long work finished from one chucking, where no sub-spindle transfer is needed

Frequently Asked Questions

01 How long a part can the SMX 3100 L turn?

DN lists a maximum turning length of 2,540 mm (100 in) and a maximum turning diameter of 660 mm (26 in), with a 12 in chuck. The standard SMX 3100 turns 1,540 mm (61 in). Usable length on a given job also depends on the chuck jaws, the tooling and how the far end of the part is supported.

02 What changes between the SMX 3100 and the SMX 3100 L?

Turning length, footprint and weight. The SMX 3100 L turns 2,540 mm (100 in) where the SMX 3100 turns 1,540 mm (61 in). The L weighs 20,100 kg (44,313 lb) against 16,300 kg (35,935 lb) for the SMX 3100, and its footprint is 7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in). Chuck size, turning diameter, spindle speed, power and torque are identical.

03 Does the SMX 3100 L have a sub-spindle or tailstock?

The table for the SMX 3100 L lists neither. The long-bed model with a sub-spindle is the SMX 3100 LS, whose second spindle is listed at 4,000 rpm, 30 kW (40 hp) and 724 N·m (534 ft-lb). Tailstock and steady rest details are not part of DN's comparison table, so ask for them when requesting a quotation.

04 How much room does the SMX 3100 L take up?

The footprint is 7,200 × 3,011 × 2,850 mm (283 × 119 × 112 in), with 2,850 mm (112 in) as the height, and the machine weighs 20,100 kg (44,313 lb). Loading a part close to 2,540 mm (100 in) long also needs crane or hoist access along the front, so plan the aisle as well as the machine outline.

05 Is the SMX 3100 L spindle strong enough for long heavy shafts?

The spindle is rated 30 kW (40 hp) and 1,203 N·m (887 ft-lb) with a 3,000 rpm limit, the same as the other SMX 3100 variants. That is roughly 66% more torque than the 724 N·m (534 ft-lb) of the SMX 2600. On long shafts the limit is more often part deflection than spindle torque, so depth of cut is usually set by how the part is supported.