DN Solutions SMX 3100 S

$360,000 - $500,000 Updated 2026-03-19

Key Specifications

Max Turn Length

1540 mm

max turning diameter

660 mm

chuck size left

12 in

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 S is the standard-bed sub spindle variant of the SMX 3100 platform — a 12-inch chuck multi-tasking machine with 1,540 mm turning length and dual spindles for complete part processing. It sits in the heart of the SMX 3100 lineup, offering more workpiece capacity than the SMX 2600 S in a more compact package than the long-bed 3100 LS.

The left spindle drives a 12-inch chuck at 3,000 RPM with 30 kW (40 hp) and a commanding 1,203 Nm (887 ft-lbs) of torque. The right sub spindle runs at 4,000 RPM with 30 kW and 724 Nm, providing strong second-op capability with higher speed for finish operations. The B-axis milling spindle delivers 12,000 RPM with Capto C6 taper for angular milling and 5-axis contouring.

Max turning diameter is 660 mm (26 in) with 1,540 mm (60.6 in) of turning length — enough for most medium-to-large parts in job shop and production environments. At 16,700 kg (36,817 lb), it's substantially lighter than the long-bed L and LS variants, and the 5,700 x 3,011 x 2,761 mm footprint is more manageable for typical shop floors.

The FANUC 31i-B5 control with CUFOS manages all axes including synchronized spindle handoffs for part transfer. The sub spindle enables lights-out production — parts machine on the first end, transfer automatically to the sub spindle, and complete second-op work without operator intervention.

The SMX 3100 S competes directly against the Mazak Integrex i-400S and Okuma Multus B400 with sub spindle. With 12-inch chuck capacity, 1,203 Nm of torque, and B-axis milling in a proven platform, it delivers flagship-level capability at a price point that undercuts the competition by 20-30%.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm
Max Turning Length	1540 mm
Chuck Size Left	12 in
Left Spindle Speed	3,000 RPM
Left Spindle Power	30 kW (40 hp)
Left Spindle Torque	1,203 Nm (887 ft-lbs)
Right Spindle Speed	4,000 RPM
Right Spindle Power	30 kW (40 hp)
Right Spindle Torque	724 Nm (534 ft-lbs)
Milling Spindle Speed	12,000 RPM
Milling Spindle Taper	Capto C6
B Axis Range	240° (+/-120°)
Machine Weight	16,700 kg (36,817 lb)
Machine Dimensions	5,700 x 3,011 x 2,761 mm
CNC Control	FANUC 31i-B5 with CUFOS
Chuck Size	12 inch
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

12-inch chuck with 1,203 Nm torque handles heavy turning on large-diameter steel and stainless parts
Sub spindle at 4,000 RPM and 30 kW provides genuine cutting power for back-working, not a compromise
660 mm turning diameter and 1,540 mm length cover the majority of medium-to-large production parts
B-axis milling at 12,000 RPM with Capto C6 delivers real machining center capability
More compact footprint than the long-bed LS variant while delivering the same sub spindle capability
20-30% price advantage over Mazak Integrex i-400S and Okuma Multus B400 configurations

Limitations

3,000 RPM main spindle is slow for small-diameter turning — the SMX 2100 S at 5,000 RPM is faster for smaller parts
1,540 mm turning length may be limiting for very long parts — need the LS variant for parts over 60 inches
No lower turret means turning and milling happen sequentially — need the ST for simultaneous machining
16,700 kg weight still requires solid foundation and rigging planning

Best For

Job shops and production facilities machining medium-to-large diameter parts with features on both ends in a single setup Aerospace manufacturers running structural components, housings, and landing gear parts in the 12-inch chuck range Oil and gas shops producing valve bodies, manifolds, and connector assemblies that need complete processing Shops stepping up from the SMX 2600 S that need 12-inch chuck capacity and higher torque for larger workpieces Production environments prioritizing unattended operation with automated part transfer between spindles

Frequently Asked Questions

01 What does a new SMX 3100 S cost?

New machines price between $360,000 and $500,000 depending on options and configuration. Base machines with standard tool magazine start around $360K, while fully loaded configs with high-pressure coolant, probing, expanded ATC, bar feeder, and chip conveyor push toward $500K.

02 How does the SMX 3100 S compare to the SMX 2600 S?

The 3100 S steps up to a 12-inch chuck (vs 10-inch), 1,203 Nm torque (vs 724 Nm), and maintains the same 1,540 mm turning length. The bigger chuck and higher torque handle larger, heavier parts. The trade-off is a lower 3,000 RPM spindle speed vs 4,000 RPM on the 2600, and a higher price by roughly $40-60K.

03 Should I get the SMX 3100 S or the 3100 ST?

The ST adds a lower turret for simultaneous machining — turning while milling at the same time. If your parts have significant turning and milling content that can run in parallel, the ST's 20-40% cycle time savings pay for the $60-80K premium. If most of your work is turning with occasional milling, the S keeps things simpler and cheaper.

04 Can the sub spindle handle heavy roughing?

Yes. At 30 kW and 724 Nm, the sub spindle delivers serious cutting power. It runs at 4,000 RPM — faster than the 3,000 RPM main spindle — giving it good surface footage capability for finish operations. It's not a token sub spindle; it's a fully capable turning spindle.