DN Solutions Mill-Turn / Multi-Tasking Machines

DN Solutions SMX 5100 LB

Est. $600,000 - $800,000 Specs verified 2026-10-02 · dn-solutions.com Updated 2026-10-02

Image: dn-solutions.com, DN Solutions

Key Specifications

Max Spindle

1,500 rpm

Spindle Power

37 kW (50 hp)

Max Turn Length

3,050 mm (120 in)

chuck size

21 in

max turning diameter

830 mm (33 in)

spindle torque

4,200 N·m (3,098 ft-lb)

How much does the DN Solutions SMX 5100 LB cost?

Estimated price range

Est.$600,000 - $800,000

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 5100 LB is the high-torque, large-chuck form of the SMX 5100 L. It carries a 21 in chuck and a 1,500 rpm spindle listed at 37 kW (50 hp) and 4,200 N·m (3,098 ft-lb), on an envelope of 830 mm (33 in) turning diameter and 3,050 mm (120 in) turning length.

Power is the same 37 kW (50 hp) as the SMX 5100 L, so the change is in how it is delivered. The SMX 5100 L gives 1,643 N·m (1,212 ft-lb) up to 2,400 rpm. The SMX 5100 LB gives about 2.6 times the torque of the SMX 5100 L and stops at 1,500 rpm. On a part 830 mm (33 in) across, spindle speeds are low whatever the machine, and torque is what limits depth of cut. That is the work the LB is specified for: large forgings, rings and flanges, big interrupted cuts.

The 21 in chuck matters as much as the torque. A 15 in chuck on the SMX 5100 L leaves a long reach from jaw to rim on a large-diameter part; the bigger chuck grips closer to where the cut is. DN's table gives the chuck size only, with no bar capacity or spindle bore figure, so through-spindle work has to be checked with DN.

The LB weighs 33,000 kg (72,753 lb), against 31,000 kg (68,343 lb) for the SMX 5100 L, on the same 9,222 × 3,597 × 3,346 mm (363 × 142 × 132 in) footprint. If a second spindle is needed, the SMX 5100 LSB lists a sub-spindle with the same 1,500 rpm and 4,200 N·m (3,098 ft-lb). Series features described by DN include B-axis and C-axis control to 0.0001 degree and thermal compensation of the spindle and feed axes.

Full Specifications

Parameter	Value
Chuck Size	21 in
Max Turning Diameter	830 mm (33 in)
Max Turning Length	3,050 mm (120 in)
Max Spindle Speed	1,500 rpm
Spindle Motor Power	37 kW (50 hp)
Spindle Torque	4,200 N·m (3,098 ft-lb)
Floor Space Required	9,222 × 3,597 × 3,346 mm (363 × 142 × 132 in)
Machine Weight	33,000 kg (72,753 lb)

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

Strengths & Limitations

Strengths

4,200 N·m (3,098 ft-lb) of spindle torque, about 2.6 times the 1,643 N·m (1,212 ft-lb) of the SMX 5100 L
21 in chuck for gripping large-diameter work inside the 830 mm (33 in) turning limit
3,050 mm (120 in) turning length, so heavy shafts and rolls fit as well as chuck work
Same footprint as the SMX 5100 L: 9,222 × 3,597 × 3,346 mm (363 × 142 × 132 in)
Orthogonal structure and B-axis and C-axis control to 0.0001 degree in DN's series description

Limitations

Top speed is 1,500 rpm, against 2,400 rpm on the SMX 5100 L, which holds back small-diameter finishing
Power stays at 37 kW (50 hp); the extra torque comes from lower speed, not from a larger motor rating
Weighs 33,000 kg (72,753 lb), so floor capacity and lifting need to be confirmed
No spindle bore, bar capacity or milling spindle data in DN's table for this model

Best For

Heavy roughing of large forgings and castings up to 830 mm (33 in) in diameter Large-diameter flanges, rings and hubs gripped in a 21 in chuck Long, heavy shafts up to 3,050 mm (120 in) where torque limits the cut Tough materials turned at low speed and high torque

Frequently Asked Questions

01 What does the B change on the SMX 5100 LB?

DN's table shows three changes from the SMX 5100 L: the chuck goes from 15 in to 21 in, top speed from 2,400 rpm to 1,500 rpm, and torque from 1,643 N·m (1,212 ft-lb) to 4,200 N·m (3,098 ft-lb). Power, turning diameter and turning length are unchanged. The SMX 5100 LB weighs 33,000 kg (72,753 lb), the SMX 5100 L 31,000 kg (68,343 lb).

02 Is the 1,500 rpm spindle speed a limitation?

On large diameters, no: at the 830 mm (33 in) limit the spindle runs far slower than 1,500 rpm for any normal cutting speed. It becomes a limit on small journals, small bores and finishing passes on slender sections, where the SMX 5100 L and its 2,400 rpm spindle are better suited. Match the model to the diameter range that fills most of your hours.

03 How much torque does the SMX 5100 LB have?

4,200 N·m (3,098 ft-lb) from a 37 kW (50 hp) spindle. For comparison, the SMX 5100 L lists 1,643 N·m (1,212 ft-lb) from the same power. DN's table gives one torque figure and does not state the speed at which it is available or the duty rating behind it.

04 Is the SMX 5100 LB available with a sub-spindle?

The model with that combination in DN's table is the SMX 5100 LSB, which lists a 21 in chuck, the same 1,500 rpm, 37 kW (50 hp) and 4,200 N·m (3,098 ft-lb) on the main spindle, a sub-spindle with identical figures, and a weight of 35,900 kg (79,146 lb).

05 How large and heavy is the SMX 5100 LB?

Footprint is 9,222 × 3,597 × 3,346 mm (363 × 142 × 132 in), listed as length, width and height, and the machine weighs 33,000 kg (72,753 lb). Workpieces for a 21 in chuck machine are heavy in their own right, so size the crane for the part and the chuck jaws as well as for installation.