DN Solutions SMX 5100 XLB

$850,000 - $1,200,000 Updated 2026-03-19

Key Specifications

Max Turn Length

4070 mm

chuck size

21 inch

max turning diameter

830 mm

main spindle speed

1,500 RPM

main spindle power

37 kW (50 hp) / 4,200 Nm (3,098 ft-lbs)

machine length

10,749 mm (423.2 in)

Overview

The DN Solutions SMX 5100 XLB pairs the extended-length bed of the XL series with a massive 21-inch chuck, creating one of the most capable multi-tasking platforms in DN Solutions' lineup. This machine is purpose-built for heavy, large-bore workpieces that demand both turning and milling in a single setup.

That 21-inch chuck is driven by a 37 kW (50 hp) spindle producing an enormous 4,200 Nm (3,098 ft-lbs) of torque at 1,500 RPM. The 'B' designation across the SMX line always means bigger bore, bigger chuck, and more torque at the expense of top-end spindle speed. At 1,500 RPM vs 2,400 RPM on the standard XL, you're trading high-speed capability for the ability to grip and muscle through large-diameter heavy parts.

The work envelope matches the XL at 830 mm (32.7 in) max turning diameter and 4,070 mm (160.2 in) max turning length, but the 21-inch chuck opens up large-bore work that the 15-inch version simply can't hold. Think pipe flanges, large valve bodies, pump housings, and structural rings that need both OD turning and complex milling operations.

At 39,000 kg (85,980 lb), the XLB is the heaviest machine in the SMX 5100 family. That extra 2,000 kg over the standard XL comes from the beefier spindle and chuck assembly. The full B-axis milling capability means parts come off this machine complete — no secondary operations on a boring mill or machining center. For shops producing large, heavy, complex parts in low volumes, the XLB eliminates entire process chains. Specs sourced from DN Solutions published data.

Full Specifications

Parameter	Value
Chuck Size	21 inch
Max Turning Diameter	830 mm
Max Turning Length	4070 mm
Main Spindle Speed	1,500 RPM
Main Spindle Power	37 kW (50 hp) / 4,200 Nm (3,098 ft-lbs)
Machine Length	10,749 mm (423.2 in)
Machine Width	3,597 mm (141.6 in)
Machine Height	3,398 mm (133.8 in)
Machine Weight	39,000 kg (85,980 lb)
CNC Control	FANUC 31i-B5 with 5-axis simultaneous
Metric	IMPERIAL
Capacity	Chuck sizeMax. Turning DiameterMax. Turning Length
Left Spindle	Max. Spindle SpeedMax. Spindle PowerMax. Spindle Torque
Right Spindle	Max. Spindle SpeedMax. Spindle PowerMax. Spindle Torque
Dimensions	LengthHeightWidthWeight
Favorites	SMX5100XLB

Specifications sourced from dn-solutions.com — verified 2026-03-28

Strengths & Limitations

Strengths

21-inch chuck with 4,200 Nm of torque handles large-bore and heavy workpieces that smaller-chuck mill-turn machines can't grip or drive
4,070 mm turning length combined with 830 mm diameter covers an enormous work envelope for long, heavy parts in a single setup
39,000 kg machine mass delivers outstanding rigidity and vibration damping during heavy cuts on large, challenging workpieces
Full B-axis milling eliminates the need for secondary boring mill or machining center operations on complex large parts
Proven SMX platform architecture means reliable performance backed by DN Solutions' global service network
Done-in-one processing on parts that would typically require 3-4 separate machines reduces lead times by days or weeks

Limitations

1,500 RPM max spindle speed severely limits small-diameter and finishing operations where higher surface speeds are needed
39,000 kg weight demands heavy-duty foundations, specialized rigging, and substantial floor space that restricts installation options
Single-spindle configuration without sub-spindle means back-working requires manual rechucking or stepping to the LSB variant
Price approaching $1M+ puts this firmly in the capital-intensive production equipment category, not a general-purpose job shop purchase
Limited availability of 21-inch chuck tooling and workholding compared to standard 15-inch setups

Best For

Oil and gas producers machining large valve bodies, BOP components, and wellhead equipment with complex milling and turning features Power generation shops turning and milling large turbine components, generator housings, and reactor vessel parts Mining and heavy equipment manufacturers producing large-bore cylinders, housings, and structural components Defense contractors handling large-caliber ordnance, missile casings, and heavy structural aerospace parts Contract manufacturers specializing in low-volume, high-value large parts where setup elimination drives profitability

Frequently Asked Questions

01 What does the 'B' designation mean on the SMX 5100 XLB?

The 'B' across DN Solutions' SMX lineup indicates a big-bore variant with a larger chuck and more torque at lower RPM. The XLB uses a 21-inch chuck with 4,200 Nm of torque at 1,500 RPM, compared to the standard XL's 15-inch chuck with 1,643 Nm at 2,400 RPM. You're trading spindle speed for gripping capacity and raw turning power.

02 How much does a DN Solutions SMX 5100 XLB cost?

New SMX 5100 XLB machines typically price between $850,000 and $1,200,000 depending on configuration. The 21-inch chuck and heavy-duty spindle assembly add a premium over the standard XL. Fully optioned machines with high-pressure coolant, probing, and expanded tool capacity push toward the top end.

03 What's the bar capacity through the 21-inch chuck spindle?

The large-bore spindle on the XLB accommodates significantly larger bar stock than the standard 15-inch chuck variant. Exact bar capacity depends on the chuck and drawbar configuration ordered, but the big-bore design is specifically intended for large-diameter through-hole work including pipe and tubular components.

04 Can the SMX 5100 XLB do 5-axis simultaneous machining?

Yes. Like all SMX-series machines, the 5100 XLB runs on a FANUC 31i-B5 control with full 5-axis simultaneous capability using the B-axis milling spindle, C-axis, and X/Y/Z linear axes. This enables complex freeform surface machining directly on the multi-tasking platform.