DMG Mori GMC 35ISM

$650,000 - $900,000 Updated 2026-03-16

Key Specifications

Max Spindle

6,300 RPM per spindle (ISM)

Spindle Power

16 kW (21.5 hp) per spindle

number of spindles

bar capacity

35 mm (1.38 in)

turning length

100 mm (3.94 in)

number of axes

Up to 31 CNC axes

Overview

The DMG Mori GMC 35ISM is a 6-spindle CNC multi-spindle automatic lathe for bar stock up to 35 mm (1.38 in) diameter, originally developed by Gildemeister as part of their long-running multi-spindle program before the DMG Mori merger. The "ISM" designation stands for Integrated Spindle Motor — each of the 6 main spindles uses a built-in motor rather than belt or gear drive, providing higher torque density and better speed control. This is one of the most established CNC multi-spindle platforms in production, with machines from the mid-2000s onward still running in tier-1 automotive and hydraulic plants around the world.

The GMC 35ISM features 6 independently driven spindles with integrated motors reaching 6,300 RPM and delivering 16 kW per spindle — substantially more power than competing machines in this size class. The machine accommodates up to 3 cross slides and 2 end-working units per station, controlled by a Siemens 840D sl CNC. The ISM spindle technology gives the GMC 35 excellent thermal stability and vibration characteristics, translating to better surface finishes and tighter tolerances in production. The 35 mm bar capacity slightly exceeds the INDEX MS32C, giving it an edge for parts in the 32-35 mm range.

The GMC 35ISM is the go-to machine for shops that need maximum rigidity and power in a 6-spindle CNC multi-spindle. It's particularly strong in applications involving difficult materials like 4340 alloy steel, 17-4 PH stainless, and Grade 5 titanium, where the ISM spindle's 16 kW and superior vibration damping allow aggressive cutting parameters that lighter machines cannot sustain. The Gildemeister multi-spindle heritage goes back over 70 years, and the GMC 35ISM represents the pinnacle of that engineering tradition. New machines are priced between $650,000 and $900,000. Used units from 2010-2020 trade between $300,000 and $600,000.

Full Specifications

Parameter	Value
Number Of Spindles	6
Bar Capacity	35 mm (1.38 in)
Max Spindle Speed	6,300 RPM per spindle (ISM)
Turning Length	100 mm (3.94 in)
Number Of Axes	Up to 31 CNC axes
Cross Slides Per Spindle	Up to 3
End Working Units	Up to 2 per station
Back Working Spindle	Yes, with C-axis
Tool Positions	Up to 42 tool positions
CNC Control	Siemens 840D sl
Spindle Motor Type	Integrated Spindle Motor (ISM)
Machine Weight	11,000 kg (24,251 lb)
Floor Space Required	Approx. 4.5 x 2.5 m (14.8 x 8.2 ft)
Spindle Motor Power	16 kW (21.5 hp) per spindle
Developer	Apple
Popularity	4.2\|3419Votes

Strengths & Limitations

Strengths

Integrated Spindle Motor (ISM) technology provides 16 kW per spindle with superior thermal stability and vibration characteristics compared to belt-driven spindles
35 mm bar capacity slightly exceeds the INDEX MS32C (32 mm), providing extra capability for parts in the 32-35 mm range without stepping up to a larger machine class
Gildemeister multi-spindle heritage spanning 70+ years ensures a proven, refined design with decades of field reliability data and continuous improvement
ISM spindle construction enables excellent surface finishes in difficult materials like 17-4 PH stainless and Grade 5 titanium where vibration damping is critical
DMG Mori's global service network — the largest in the machine tool industry — provides fast parts availability and service response worldwide
Robust 11,000 kg machine weight provides rigidity for heavy cuts in alloy steels and stainless without chatter, even at aggressive feed rates

Limitations

The Gildemeister heritage means some aspects of the control interface and programming workflow feel older compared to INDEX's more modern VirtualLine approach
At $650,000-$900,000 new, pricing is at the premium end for 6-spindle machines, reflecting the ISM spindle technology and DMG Mori brand premium
Setup times of 6-10 hours for full changeover make the GMC 35ISM impractical for batch sizes below 10,000 pieces — shops needing fast changeover should consider the Tornos MultiSwiss
The 11,000 kg weight and 4.5 x 2.5 m footprint require substantial floor space and floor loading capacity, plus rigging equipment for installation
ISM spindle repairs are more expensive than conventional spindle rebuilds due to the integrated motor technology — budget $15,000-$25,000 per spindle rebuild

Best For

Automotive tier-1 suppliers producing transmission components, ABS sensor housings, fuel rail fittings, and driveline parts in alloy steel and stainless up to 35 mm diameter Hydraulic and pneumatic OEMs producing valve bodies, spool valves, and high-pressure fittings requiring aggressive material removal in hardened steels Shops machining difficult materials like 17-4 PH stainless, Inconel, and Grade 5 titanium where the ISM spindle's power and vibration characteristics deliver measurable quality advantages Production facilities with existing DMG Mori relationships and service contracts who want multi-spindle capability integrated into their DMG Mori equipment ecosystem High-volume production shops replacing older Gildemeister cam-type or early CNC multi-spindle automatics with a modern CNC platform from the same manufacturer lineage

Frequently Asked Questions

01 What is ISM spindle technology?

ISM stands for Integrated Spindle Motor. Instead of driving each spindle through belts or gears from an external motor, the motor is built directly into the spindle housing. This eliminates belt vibration and backlash, provides more consistent speed control, and improves thermal stability since there's no belt-generated heat. The tradeoff is higher spindle rebuild costs ($15,000-$25,000 vs $8,000-$15,000 for conventional spindles), but the improved part quality and reduced maintenance of belt/gear systems typically offset this over the machine's life.

02 How does the GMC 35ISM compare to the INDEX MS32C?

The GMC 35ISM offers 35 mm bar capacity vs 32 mm, 16 kW per spindle vs 10 kW, and ISM spindle technology for better vibration damping. The INDEX MS32C has a more modern CNC programming environment through VirtualLine software and is generally considered easier to program and set up. Both use Siemens 840D sl controls. Pricing is comparable. The GMC 35ISM tends to be preferred for heavy-duty cutting in difficult materials, while the INDEX MS32C is favored for programming efficiency and faster setup optimization.

03 Is the GMC 35ISM still in production?

The GMC 35ISM continues to be available through DMG Mori, though production volumes are limited compared to DMG Mori's turning center and milling machine lines. The multi-spindle product line has a smaller but dedicated engineering team. DMG Mori also offers the MultiSprint 36 as a more modern multi-spindle alternative with faster changeover capability. Shops considering a new purchase should request current availability and lead times from DMG Mori directly.

04 What does a used GMC 35ISM cost?

Used GMC 35ISM machines from 2010-2020 typically trade between $300,000 and $600,000 depending on condition, hours, and configuration. Machines with low hours and recent spindle rebuilds command the higher end. The GMC platform has strong resale value due to its proven reliability and the ongoing availability of parts through DMG Mori. When buying used, inspect spindle runout, check for thermal drift, and verify the Siemens 840D sl control is on a supported software version.