DN Solutions SMX 2100 STB

Est. $340,000 - $470,000 Updated 2026-08-10

Key Specifications

Max Turn Length

1040 mm

max turning diameter

600 mm

chuck size left

10 in

chuck size right

8 in

left spindle speed

4,000 RPM

left spindle power

22 kW (29.5 hp)

Overview

The DN Solutions SMX 2100 STB is the big-bore simultaneous machining variant — combining the 10-inch left chuck (B), sub spindle (S), and lower turret (T) into one package. It's the most heavily configured standard-bed SMX 2100 you can buy, designed for shops that need larger workholding plus the cycle time advantages of simultaneous machining.

The left spindle drives the 10-inch chuck at 4,000 RPM with 22 kW (29.5 hp) and 512 Nm (378 ft-lbs) of torque. The right sub spindle uses an 8-inch chuck at 5,000 RPM with 22 kW and 467 Nm. The B-axis milling head runs at 12,000 RPM with 240-degree travel, and the lower turret adds live tooling for simultaneous turning or driven-tool operations while the upper spindle mills.

At 15,900 kg (35,053 lb), the STB is the heaviest standard-bed SMX 2100 variant. Max turning diameter is 600 mm (23.6 in) across 1,040 mm (40.9 in). The footprint stays at 4,845 x 2,770 x 2,777 mm — same as every other standard-bed 2100.

The FANUC 31i-B5 control manages multi-channel simultaneous operations. You get the ability to rough turn with the lower turret while the B-axis drills cross-holes, then transfer the part to the sub spindle for second-op work — all in one unattended cycle. It's the configuration for production shops that have outgrown the 8-inch chuck but don't want to jump to the physically larger and more expensive SMX 2600 ST.

The STB fills a very specific niche in the SMX lineup. If you need the 10-inch chuck for first-op gripping, the sub spindle for automated back-working, and the lower turret for cycle time reduction, this is your machine. If you only need two of those three things, one of the simpler variants will save you money.

Full Specifications

Parameter	Value
Max Turning Diameter	600 mm
Max Turning Length	1040 mm
Chuck Size Left	10 in
Chuck Size Right	8 in
Left Spindle Speed	4,000 RPM
Left Spindle Power	22 kW (29.5 hp)
Left Spindle Torque	512 Nm (378 ft-lbs)
Right Spindle Speed	5,000 RPM
Right Spindle Power	22 kW (29.5 hp)
Right Spindle Torque	467 Nm (344 ft-lbs)
Milling Spindle Speed	12,000 RPM
B Axis Range	240° (+/-120°)
Lower Turret	Yes (live tooling)
Machine Weight	15,900 kg (35,053 lb)
Machine Dimensions	4,845 x 2,770 x 2,777 mm
CNC Control	FANUC 31i-B5 with CUFOS
Chuck Size	10 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

10-inch left chuck grips larger-diameter parts than 8-inch variants without stepping up to the physically larger SMX 2600
Simultaneous machining with lower turret and B-axis milling head cuts cycle times 20-40% on complex parts
Full sub spindle at 22 kW handles back-working with genuine cutting capability for complete part processing
512 Nm torque on the main spindle provides strong cutting force for steel turning at the larger chuck size
Same footprint as all standard-bed SMX 2100 variants despite packing the most features
Fills the gap between 8-inch SMX 2100 ST and 10-inch SMX 2600 ST in both capability and price

Limitations

Highest price in the standard-bed SMX 2100 family — the combination of big bore, sub spindle, and lower turret costs a premium
Mixed chuck sizes (10-inch and 8-inch) mean some parts can't transfer between spindles at full diameter
4,000 RPM left spindle is slower than the 5,000 RPM 8-inch variants, limiting SFM on small diameters
Multi-channel programming complexity is substantial — requires experienced programmers and verified CAM posts
1,040 mm turning length may still be limiting for longer parts

Best For

Production shops machining medium-to-large diameter parts that need simultaneous machining and automatic back-working Shops that have outgrown the 8-inch chuck but find the SMX 2600 ST physically too large or too expensive Aerospace manufacturers working flanges, housings, and connectors in the 8-10 inch diameter range with complex features High-mix production environments that need the flexibility of a 10-inch chuck plus full simultaneous machining capability

Frequently Asked Questions

01 What's the price difference between the STB and the ST?

The STB carries a premium over the ST, but DN Solutions quotes both per configuration rather than publishing a differential. The only real difference is the left spindle: a 10-inch chuck at 4,000 RPM with 512 Nm on the STB against an 8-inch at 5,000 RPM with 467 Nm on the ST. The right spindle, B-axis milling spindle, lower turret and control are identical. If your first-op parts clamp comfortably in an 8-inch chuck, the ST gives you the same capability for less, so ask your dealer to quote both side by side.

02 Why not just get the SMX 2600 ST instead?

The SMX 2600 ST gives you 10-inch chucks on both sides, 30 kW of spindle power and 660 mm of turning diameter, but it is a physically larger and heavier machine and is quoted a class above the 2100. The 2100 STB is the answer when you need the 10-inch chuck for the first operation but your parts finish comfortably in an 8-inch sub spindle. If your envelope is genuinely close to 600 mm, get both quoted, because the floor space and foundation difference matters as much as the machine price.

03 What does a new SMX 2100 STB cost?

DN Solutions does not publish list pricing; the SMX 2100 STB is quoted per configuration through the regional dealer network. On a machine like this the options move the number more than the base does, so the items to specify carefully are high-pressure through-tool coolant, probing, ATC capacity beyond standard, chip conveyor, tailstock or steady rest, and a bar feeder sized to the 10-inch left spindle. Read a quote for what it excludes as well: turning and live tooling, holders for the B-axis milling spindle, rigging for a 15,900 kg machine, and installation and training.

04 Can the lower turret run simultaneously with the B-axis milling head?

Yes — that's the primary advantage of the T designation. The lower turret can rough turn while the B-axis head drills or mills, running two cutting operations at once. The FANUC control manages multi-channel programming to coordinate both tools and avoid collisions.