DN Solutions SMX 3100 L

$380,000 - $520,000 Updated 2026-03-19

Key Specifications

Max Turn Length

2540 mm

max turning diameter

660 mm

chuck size

12 inch

left spindle speed

3,000 RPM

left spindle power

30 kW (40 hp)

left spindle torque

1,203 Nm (887 ft-lbs)

Overview

The DN Solutions SMX 3100 L is the long-bed single-spindle variant of the SMX 3100 platform, built to handle large, heavy parts up to 2,540 mm (100 in) in turning length. That's over eight feet of turning capacity on a 12-inch chuck base with B-axis milling — a work envelope that covers long shafts, propeller shafts, rollers, and heavy cylindrical components that smaller multi-tasking machines simply can't reach.

The main spindle delivers 30 kW (40 hp) at 3,000 RPM with a massive 1,203 Nm (887 ft-lbs) of torque through the 12-inch chuck. That's the kind of torque you need for heavy roughing on large-diameter steel and stainless parts. The B-axis milling spindle runs at 12,000 RPM with Capto C6 taper for cross-drilling, angular milling, and 5-axis contouring.

Max turning diameter is 660 mm (26 in). At 20,100 kg (44,313 lb), this is a substantial machine — the long bed adds considerable mass for rigidity across the extended Z-axis travel. The footprint stretches to 7,200 x 3,011 x 2,850 mm, so plan your floor space accordingly.

The L variant doesn't include a sub spindle — it uses a programmable tailstock for long-part support. This configuration makes sense for parts that need support during long turning passes but don't require back-working. If you need back-working capability, the LS variant adds a sub spindle.

The FANUC 31i-B5 control with CUFOS handles 5-axis simultaneous machining. For shops in power generation, marine, oil and gas, or heavy equipment manufacturing, the SMX 3100 L provides multi-tasking capability on parts that would otherwise require separate turning and milling setups on much larger machines.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm
Max Turning Length	2540 mm
Chuck Size	12 inch
Left Spindle Speed	3,000 RPM
Left Spindle Power	30 kW (40 hp)
Left Spindle Torque	1,203 Nm (887 ft-lbs)
Milling Spindle Speed	12,000 RPM
Milling Spindle Taper	Capto C6
B Axis Range	240° (+/-120°)
Machine Weight	20,100 kg (44,313 lb)
Machine Dimensions	7,200 x 3,011 x 2,850 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

2,540 mm turning length handles parts up to 100 inches — well beyond what the SMX 2600 or 2100 platforms can reach
12-inch chuck with 1,203 Nm torque delivers serious heavy-duty turning capability on large-diameter steel and stainless
B-axis milling at 12,000 RPM with Capto C6 provides machining center capability on parts too long for most multi-tasking machines
20,100 kg machine mass provides thermal stability and vibration damping for tight tolerances on heavy parts
5-axis simultaneous machining through FANUC 31i-B5 with CUFOS covers complex contouring on large components
More accessible price than comparable Mazak Integrex e-800 or DMG Mori NTX 3000 long-bed configurations

Limitations

No sub spindle — parts requiring back-working need the LS variant or manual rechucking
7,200 mm machine length demands significant floor space and potentially building modifications
3,000 RPM main spindle limits surface footage on small-diameter sections of long parts
20,100 kg weight requires reinforced foundations — check floor loading before purchase
Single-spindle configuration limits automation options compared to dual-spindle variants

Best For

Power generation shops machining long turbine shafts, generator rotors, and roller components with milling features Marine manufacturers producing propeller shafts, rudder stocks, and long cylindrical components Oil and gas shops running long downhole tools, drill collars, and pipe components with cross-holes and angular features Heavy equipment manufacturers machining hydraulic cylinders, rollers, and structural shafts over 1,500 mm long Shops that need multi-tasking capability on long parts without the full cost of a sub spindle configuration

Frequently Asked Questions

01 What does a new SMX 3100 L cost?

New machines typically price between $380,000 and $520,000. The long-bed configuration adds significant cost over the standard-bed SMX 3100 due to the extended bed casting, longer ball screws, and additional guideways. Fully loaded machines push toward $520K.

02 Does the SMX 3100 L have a tailstock?

Yes. The L variant uses a programmable tailstock for long-part support during turning operations. It doesn't have a sub spindle for back-working — that's the LS variant. The tailstock is CNC-controlled and retracts automatically for milling operations.

03 How does the SMX 3100 L compare to the SMX 2600 for long parts?

The 3100 L extends turning length to 2,540 mm vs 1,540 mm on the SMX 2600, steps up to a 12-inch chuck (vs 10-inch), and delivers 1,203 Nm torque vs 724 Nm. It's built for significantly larger and heavier parts. The trade-off is a much larger footprint and higher price.

04 What's the max bar capacity through the spindle?

The SMX 3100 L accepts bar stock up to approximately 95 mm (3.7 in) through the main spindle bore, supporting bar feeder operation for medium-diameter production runs of longer parts.