DN Solutions SMX 5100 LSB

$700,000 - $950,000 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 LSB is the ultimate big-bore multi-tasking machine in the SMX lineup — 21-inch chucks on both spindles, 3,050 mm of turning length, and B-axis milling capability. It's built for the heaviest, largest parts that need complete processing in a single setup with automated back-working.

Both spindles run 37 kW (49.6 hp) at 1,500 RPM with an extraordinary 4,200 Nm (3,098 ft-lbs) of torque. That's matched big-bore power on both sides — the sub spindle delivers the same massive torque as the main spindle, so second-op heavy turning gets no compromise. The 21-inch chucks grip pipe flanges, large valve bodies, heavy forgings, and components that most multi-tasking machines couldn't even load.

Max turning diameter is 830 mm (32.7 in) across 3,050 mm (120 in) of turning length. At 35,900 kg (79,146 lb), this is the heaviest machine in the entire SMX family. The footprint stretches to 9,522 x 3,597 x 3,346 mm. You're looking at a purpose-built foundation, overhead crane access, and a facility that's planned around this machine.

The B-axis milling spindle still runs at 12,000 RPM, giving you angular milling, cross-drilling, and 5-axis contouring capability on parts that previously required separate setups on a heavy lathe, boring mill, and machining center. The FANUC 31i-B5 control with CUFOS manages all axes including synchronized big-bore spindle handoffs.

The LSB serves the most demanding heavy industry applications: nuclear power components, large marine propulsion systems, mining equipment, and oil and gas wellhead manufacturing. When your parts are too big, too heavy, and too complex for anything else, the SMX 5100 LSB is where the buck stops.

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)
Right Spindle Speed	1,500 RPM
Right Spindle Power	37 kW (49.6 hp)
Right Spindle Torque	4,200 Nm (3,098 ft-lbs)
Milling Spindle Speed	12,000 RPM
B Axis Range	240° (+/-120°)
Machine Weight	35,900 kg (79,146 lb)
Machine Dimensions	9,522 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

Matched 21-inch chucks on both spindles enable full-diameter part transfer for the largest workpieces in any multi-tasking machine
4,200 Nm torque on both sides delivers heavy-duty engine lathe performance with B-axis multi-tasking capability
3,050 mm turning length with dual big-bore spindles handles complete processing of the longest, heaviest parts
Can consolidate a heavy lathe, boring mill, and machining center into a single setup for suitable parts
35,900 kg mass provides unmatched thermal stability and vibration damping for precision on heavy components
B-axis milling at 12,000 RPM adds machining center capability to a heavy turning platform

Limitations

35,900 kg weight requires a custom-engineered reinforced foundation — major capital investment beyond machine cost
1,500 RPM spindle speed limits surface footage — strictly a large-diameter, heavy-cutting platform
Highest price in the entire SMX family by a wide margin
Loading and unloading requires overhead crane and potentially automated part handling systems
Limited market of qualified service technicians for this size of multi-tasking machine
Part transfer with 21-inch chucks across 3,050 mm adds significant non-cutting cycle time

Best For

Nuclear and power generation facilities machining large pressure vessel components, turbine casings, and generator frames Marine propulsion shops producing large-diameter shaft couplings, stern tube bearings, and propulsion system components Oil and gas manufacturers running wellhead housings, BOP components, and large valve bodies with both-end features Mining equipment manufacturers machining large crusher components, roller assemblies, and heavy structural parts Defense and aerospace shops working large-diameter components for naval vessels and heavy military equipment

Frequently Asked Questions

01 What does a new SMX 5100 LSB cost?

New machines price between $700,000 and $950,000 — the most expensive machine in the SMX lineup. Budget separately for foundation engineering and construction ($60-120K), rigging and installation ($30-60K), specialized 21-inch chuck workholding ($20-50K), and B-axis milling tooling. Total installed cost can exceed $1 million.

02 What applications justify the SMX 5100 LSB over the LS?

The LSB vs LS decision comes down to chuck size. If your parts need 21-inch gripping range for the large bore and heavy-wall components common in power generation, wellhead, and marine applications, you need the LSB. If 15-inch chucks cover your work, the LS saves $80-150K and gives you higher spindle speed (2,400 vs 1,500 RPM).

03 How many operators does the SMX 5100 LSB need?

Typically one operator with overhead crane assistance for loading/unloading. The automated spindle-to-spindle transfer runs unattended once the part is loaded. For unmanned operation, you'd need automated part handling — possible but rare at this machine size due to the weight and complexity of workpieces.

04 What's the foundation requirement?

The 35,900 kg machine weight plus dynamic cutting forces require a purpose-engineered reinforced concrete foundation, typically 400-600 mm thick, isolated from the surrounding floor with vibration dampening. DN Solutions provides detailed foundation drawings with the machine order. Have a structural engineer review your facility before purchase.