DN Solutions SMX 5100 LB

$600,000 - $800,000 Updated 2026-03-19

Key Specifications

Max Turn Length

3050 mm

max turning diameter

830 mm

chuck size

21 inch

left spindle speed

1,500 RPM

left spindle power

37 kW (49.6 hp)

left spindle torque

4,200 Nm (3,098 ft-lbs)

Overview

The DN Solutions SMX 5100 LB is the big-bore variant of the SMX 5100 L, stepping up to a 21-inch chuck for the largest workholding capacity in DN Solutions' multi-tasking lineup. The B designation means big bore — and at 21 inches, you're gripping pipe flanges, large valve bodies, and heavy forged components that no standard multi-tasking machine can handle.

The main spindle runs at 1,500 RPM with 37 kW (49.6 hp) and an extraordinary 4,200 Nm (3,098 ft-lbs) of torque. That's the spindle torque of a heavy-duty engine lathe packed into a multi-tasking platform with B-axis milling. The lower RPM is the trade-off for that massive torque — you're geared for heavy metal removal on large diameters, not high-speed small-part turning.

Max turning diameter is 830 mm (32.7 in) with 3,050 mm (120 in) of turning length. At 33,000 kg (72,752 lb), the LB is 2,000 kg heavier than the standard L variant. The footprint stays at 9,222 x 3,597 x 3,346 mm — same as the L — with the extra mass concentrated in the heavier spindle assembly and larger chuck mechanism.

The B-axis milling spindle still delivers 12,000 RPM for angular milling and cross-drilling, giving you genuine machining center capability on parts that would otherwise need crane moves between a VTL and a boring mill. The FANUC 31i-B5 control with CUFOS handles 5-axis simultaneous machining.

The LB configuration serves a specific market: heavy industry shops that need multi-tasking on very large-diameter parts. Power generation, mining equipment, marine propulsion, and oil and gas wellhead manufacturing are the core applications. If you're moving parts between a large lathe and a horizontal boring mill, the SMX 5100 LB can replace both machines for many jobs.

Full Specifications

Parameter	Value
Max Turning Diameter	830 mm
Max Turning Length	3050 mm
Chuck Size	21 inch
Left Spindle Speed	1,500 RPM
Left Spindle Power	37 kW (49.6 hp)
Left Spindle Torque	4,200 Nm (3,098 ft-lbs)
Milling Spindle Speed	12,000 RPM
B Axis Range	240° (+/-120°)
Machine Weight	33,000 kg (72,752 lb)
Machine Dimensions	9,222 x 3,597 x 3,346 mm
CNC Control	FANUC 31i-B5 with CUFOS
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 grips the largest-diameter workpieces available on any DN Solutions multi-tasking platform
4,200 Nm of spindle torque delivers heavy-duty engine lathe cutting force on a multi-tasking machine
3,050 mm turning length with 830 mm diameter handles the biggest parts in heavy industry applications
B-axis milling at 12,000 RPM eliminates separate boring mill setups for cross-holes and angular features
33,000 kg mass provides exceptional rigidity and vibration damping for heavy cutting on large forgings
Can replace a large lathe and horizontal boring mill for many large-diameter parts, consolidating two machines into one

Limitations

1,500 RPM spindle speed severely limits surface footage — not suitable for small-diameter or high-speed turning
33,000 kg weight demands a heavy-duty foundation engineered specifically for this machine
No sub spindle — tailstock support only, so back-working requires manual rechucking
Highest price in the standard-length SMX 5100 family due to the heavy-duty spindle and 21-inch chuck assembly
Loading and unloading 21-inch chuck workpieces requires overhead crane access

Best For

Power generation shops machining large turbine housings, generator frames, and heavy rotor components Oil and gas manufacturers producing wellhead components, large valve bodies, and BOP (blowout preventer) parts Marine propulsion shops running large-diameter shaft couplings, stern tube bearings, and propulsion components Mining equipment manufacturers machining large rollers, crusher components, and heavy structural parts Shops consolidating large-lathe and boring-mill operations into a single multi-tasking setup

Frequently Asked Questions

01 What does a new SMX 5100 LB cost?

New machines run $600,000 to $800,000 depending on configuration. The 21-inch chuck and heavy-duty spindle assembly carry a premium over the standard 15-inch L variant. Foundation costs ($40-100K) and rigging/installation ($20-40K) are significant additional expenses.

02 Why is the spindle speed only 1,500 RPM?

The 21-inch chuck and 4,200 Nm torque specification demands different gearing than the standard 15-inch variant. At large diameters (600-830 mm), you only need 300-600 RPM for proper surface speed on steel. The 1,500 RPM top speed provides adequate SFM for all reasonable part diameters at this chuck size.

03 How does the LB compare to the standard L?

The LB steps up from a 15-inch to 21-inch chuck, drops spindle speed from 2,400 to 1,500 RPM, and increases torque from 1,643 to 4,200 Nm. Same 37 kW power, same turning diameter and length, same B-axis milling. The LB is 2,000 kg heavier. Choose it when your parts require the 21-inch chuck's gripping range.

04 Can the SMX 5100 LB handle heavy interrupted cutting?

Yes. The 33,000 kg machine mass, 4,200 Nm spindle torque, and robust guideway construction handle heavy interrupted cutting well. The B-axis milling head also provides rigid milling capability for heavy face milling and pocket milling on large workpieces. For the heaviest interrupted cuts, consider using reduced parameters during entry to protect the tooling.