Doosan Puma GT 3100

$280,000 - $420,000 Updated 2026-03-17

Key Specifications

Max Spindle

2,500 RPM

Spindle Power

37 kW (49.6 hp)

Max Turn Length

755 mm (29.7 in)

Accuracy

±0.005 mm (±0.0002 in)

Repeatability

±0.002 mm (±0.00008 in)

max turning diameter over bed

780 mm (30.7 in)

Overview

The Doosan Puma GT 3100 is a large-bore, high-power gang-turret turning center positioned at the top of Doosan's PUMA GT series. Designed for turning large-diameter components in energy, oil and gas, power generation, and heavy industry, the GT 3100 offers a 15-inch chuck, 102 mm spindle through-bore, and a maximum turning diameter of 780 mm (30.7 in) — specifications that address workpieces too large for the PUMA 3100B and competitive machines in the 12-inch class. The GT designation denotes Doosan's high-power, heavy-duty turning line built for sustained deep-cut operations in demanding materials.

The main spindle delivers 37 kW (49.6 hp) at up to 2,500 RPM through an A2-11 spindle nose, producing the torque profile needed for interrupted heavy cuts in steel forgings, large flanges, and thick-wall pipe. The 15-station VDI 50 turret provides generous tooling capacity and handles large OD turning tools, boring bars, and heavy threading inserts without the tool-interference issues that plague smaller VDI 40 turrets when running large-shank tooling. Turret index time of 0.25 seconds keeps cycle times competitive even in programs with frequent tool changes.

Optional live tooling at 4,000 RPM (5.5 kW) enables cross-drilling, radial milling, and face milling operations on the lathe without secondary VMC setup. The optional Y-axis (±75 mm) extends capability to off-center milling, eccentric boring, and keyway cutting on large-diameter parts — functionality that eliminates the need to transfer heavy parts to a horizontal boring mill for secondary operations. The PUMA GT 3100 runs on the Fanuc 31i-B5 control with Doosan's Smart Turning application for tool life management, spindle load monitoring, and adaptive feed control.

Pricing for the PUMA GT 3100 ranges from $280,000 to $420,000 depending on live tooling, Y-axis, sub-spindle, and bar feeder configurations. It competes with the Mazak Quick Turn Nexus 450, the Okuma LB6000 EX, and the Mori Seiki NLX 6000 in the large-bore turning center category. Doosan's competitive position combines high power specifications, a large turning envelope, and Korean pricing that typically undercuts Japanese equivalents by 15–25% for comparable configurations.

Full Specifications

Parameter	Value
Max Turning Diameter Over Bed	780 mm (30.7 in)
Max Turning Diameter Over Cross Slide	420 mm (16.5 in)
Max Turning Length	755 mm (29.7 in)
Chuck Size	12 in
Bar Capacity	102 mm (4.0 in)
Max Spindle Speed	2,500 RPM
Spindle Motor Power	37 kW (49.6 hp)
Spindle Torque Max	3,500 N·m
Spindle Nose	A2-11
Turret Stations	12 Slot
Turret Index Time	0.25 sec (adjacent station)
Live Tool Speed Max	4,000 RPM (optional)
Live Tool Power	5.5 kW (7.4 hp) (optional)
Y Axis Travel	±75 mm (optional)
X Axis Travel	400 mm (15.7 in)
Z Axis Travel	1,700 mm (66.9 in)
Rapid Traverse X	18 m/min (709 ipm)
Rapid Traverse Z	22 m/min (866 ipm)
Positioning Accuracy	±0.005 mm (±0.0002 in)
Repeatability	±0.002 mm (±0.00008 in)
Machine Weight	5500 kg (12128 lbs.)
CNC Control	Fanuc 31i-B5 with Doosan Smart Turning
Coolant Capacity	600 L (158 gal)
Travel Distance X Axis	260 mm (10.2 in)
Travel Distance Z Axis	830 mm (32.7 in)
Rapid Traverse X Axis	24 m/min (945 in/min)
Rapid Traverse Z Axis	30 m/min (1181 in/min)
Speed	2800 rpm
Power	35 kW (46.9 Hp)
Torque	1613 Nm (1189 ft-lbs)
Shank	BMT-KEY
Boring Bar Diameter	⌀50 mm (2 in)
Length	4068 mm (160.2 in.)
Height	1890 mm (74.4 in.)
Width	2035 mm (80.1 in.)
Max Turning Diameter	⌀481 mm (18.9 in)
Through Hole Diameter	⌀103 mm (4.1 in)

Specifications sourced from ellisontechnologies.com — verified 2026-03-28

Strengths & Limitations

Strengths

37 kW (49.6 hp) spindle with 3,500 N·m torque provides the power needed for heavy interrupted cuts in large steel forgings, thick-wall pipe, and heat-resistant alloys
780 mm maximum turning diameter over the bed accommodates the large flanges, pressure vessel components, and heavy equipment shafts that exceed 12-inch turning center capacity
15-station VDI 50 turret handles large-shank tooling without interference — critical when running 50 mm boring bars and 32 mm OD turning tools on large workpieces
102 mm spindle through-bore supports bar-fed production automation for large-diameter bar stock up to 4 inches, enabling automated turning of energy-sector components
Optional Y-axis (±75 mm) eliminates secondary horizontal boring mill operations for off-center features on heavy parts that are costly to refixtured and transfer

Limitations

2,500 RPM maximum spindle speed is inherently limited by the large spindle bore — high-speed finishing of small-diameter features requires secondary operations on a faster lathe
18,000 kg machine weight requires reinforced concrete foundations and extensive site preparation — not suitable for standard machine shop floor slabs without engineering assessment
Pricing from $280,000–$420,000 places the GT 3100 in a capital investment category requiring rigorous justification — shops without a confirmed pipeline of large-bore turning work face underutilization risk

Best For

Oil and gas equipment manufacturers producing large valve bodies, wellhead components, manifolds, and riser pipe segments requiring 15-inch chuck capacity and heavy power Power generation shops turning turbine shafts, bearing housings, generator end bells, and large coupling flanges in alloy steel and stainless steel Defense and heavy equipment contractors producing large hydraulic cylinders, gun barrels, large-caliber projectile bodies, and heavy vehicle axle components Job shops specializing in large-bore turning work serving energy, petrochemical, and marine industries where the 780 mm turning diameter creates a competitive capability advantage

Frequently Asked Questions

01 How does the Doosan PUMA GT 3100 differ from the PUMA 3100B?

The PUMA 3100B is a 12-inch chuck machine with 640 mm turning diameter and 26 kW spindle, aimed at mid-size industrial turning. The PUMA GT 3100 is a 15-inch chuck machine with 780 mm turning diameter and 37 kW spindle — categorically different in size, power, and target application. The GT designation means heavy-duty large-bore turning. Price difference is substantial: $140K–$200K for the 3100B vs $280K–$420K for the GT 3100. Shops with true large-bore requirements need the GT 3100; shops with occasional large-diameter work can often use the 3100B with a 15-inch chuck adapter.

02 What is the maximum bar diameter the GT 3100 can process with a bar feeder?

The spindle through-bore is 102 mm (4.0 in), supporting bar stock up to approximately 95–100 mm with appropriate bar feeder guide bushings. LNS, Iemca, and FMB offer heavy-duty bar feeders compatible with the PUMA GT 3100's bore size. Bars above 80 mm diameter are heavy enough that a rigid bar feeder with servo-controlled follower rest is strongly recommended to prevent vibration and bar whip at extended bar lengths.

03 Can the GT 3100 perform complete machining in a single setup?

With the optional live tooling turret (4,000 RPM, 5.5 kW), Y-axis (±75 mm), and sub-spindle (available as factory option), the GT 3100 can perform OD turning, facing, boring, cross-drilling, radial milling, threading, and back-working — all in a single chucking. For shops producing complex energy-sector parts like fully-featured valve bodies with multiple cross-holes, boss faces, and threaded ports, this complete-machining capability reduces setup time and improves part concentricity significantly.

04 What foundation is required for the PUMA GT 3100?

At 18,000 kg, the PUMA GT 3100 requires a dedicated concrete foundation typically 400–600 mm deep with proper reinforcement. Doosan provides a foundation drawing specifying the pad dimensions, anchor bolt layout, and concrete specification. A structural engineer should review the foundation design for the specific site. Most industrial facilities with standard machine shop slabs (150–200 mm) are not adequate — a foundation pour is almost always required.

05 How does Doosan support the GT 3100 in North America?

Doosan Machine Tools North America operates from a US headquarters and supports the GT series through regional distributors and direct factory service in major markets. The GT 3100 is a capital machine that typically receives application support during commissioning, including spindle run-in, geometry verification, and initial production trials. Spare parts for the GT series are stocked at Doosan's US parts depot. Response time for field service in major manufacturing corridors (Midwest, Southeast, Gulf Coast) is typically 24–48 hours.