Mägerle MGC-B-840

$1,200,000 - $1,800,000 Updated 2026-03-17

Key Specifications

table longitudinal travel

840 mm (33.1 in)

table cross travel

700 mm (27.6 in)

vertical travel

550 mm (21.7 in)

max workpiece weight

800 kg (1,764 lb)

axis drive system

Linear motors (X, Y, Z axes)

grinding spindle power

55 kW (73.7 HP)

Overview

The Mägerle MGC-B-840 is a high-removal-rate CNC creep-feed grinding machine in Mägerle's MGC-B (Blade) series, built specifically for the high-throughput, precision grinding of aerospace turbine blade root forms, compressor blade profiles, and vane segments on large aerospace platforms. The 840 designation indicates the machine's 840 mm longitudinal table travel, providing working capacity for the longer blade geometries found on large commercial turbofan and military turbine engines. Mägerle, part of the United Grinding Group, developed the MGC-B series as a production-optimized platform where the emphasis is maximum material removal rate in combination with the profile accuracy and surface integrity required for gas turbine flight hardware.

The MGC-B-840 uses linear motor drives on all primary axes — eliminating the backlash, compliance, and wear of ballscrew drives. Linear motors provide direct, stiff axis actuation with positioning repeatability of ±1 µm, essential when grinding fir-tree and dovetail root form tolerances that are frequently in the ±2–5 µm total range. The machine's active thermal management system monitors temperature at the bed, spindle, and coolant continuously, applying model-based corrections to axis positions to prevent dimensional drift as the machine cycles from cold start through thermal equilibrium.

Spindle power reaches 55 kW on the MGC-B-840 — among the highest available on any production creep-feed grinding machine — enabling the aggressive infeed rates required for high-MRR creep-feed grinding of Inconel 718, titanium 6Al-4V, and René alloy blade profiles. The machine supports vitrified CBN and conventional abrasive wheels up to 500 mm diameter at peripheral speeds to 80 m/s. An automatic wheel changer with up to 12 positions allows the machine to cycle through roughing, semi-finish, and finish grinding operations without operator intervention, supporting fully unattended multi-operation grinding cycles for large turbine blade batches.

Control is via Siemens 840D sl with Mägerle's proprietary grinding software for turbine blade production, including automatic dressing management, in-process gauging integration, and NADCAP-compatible process traceability data logging. New pricing for the MGC-B-840 falls in the $1,200,000–$1,800,000 range depending on automation configuration, wheel changer, and robot loading options — positioning it as one of the most capable and highest-investment production grinding machines available for the aerospace turbine segment.

Full Specifications

Parameter	Value
Table Longitudinal Travel	840 mm (33.1 in)
Table Cross Travel	700 mm (27.6 in)
Vertical Travel	550 mm (21.7 in)
Max Workpiece Weight	800 kg (1,764 lb)
Axis Drive System	Linear motors (X, Y, Z axes)
Grinding Spindle Power	55 kW (73.7 HP)
Max Wheel Peripheral Speed	80 m/s
Max Grinding Wheel Diameter	500 mm (19.7 in)
Cnc Axes	5-axis (X, Y, Z + A, B optional rotary)
Positioning Repeatability	±1 µm
Wheel Changer	Automatic (up to 12 positions)
Thermal Compensation	Active thermal management — bed, spindle, coolant
Coolant Pressure	Up to 150 bar (2,175 psi)
CNC Control	Siemens 840D sl with Mägerle turbine blade grinding software
Machine Base	Polymer concrete with active thermal stabilization
Manufacturer	GE Healthcare
Model	M3550

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

Strengths & Limitations

Strengths

55 kW grinding spindle delivers the highest material removal rates available in production creep-feed grinding — dramatically reducing cycle time per blade versus lower-powered platforms
Linear motor drives on all primary axes eliminate backlash entirely, providing ±1 µm positioning repeatability essential for aerospace fir-tree and dovetail root form tolerances
840 mm longitudinal travel accommodates the longer blade geometries on large commercial turbofan and military turbine engines that smaller MGC-B variants cannot reach
12-position automatic wheel changer enables roughing, semi-finish, and finish operations in a single unattended cycle — no manual wheel changes between operations
Active thermal management prevents dimensional drift during production shifts, essential for maintaining profile accuracy across large batches of flight-critical turbine hardware

Limitations

At $1,200,000–$1,800,000, the MGC-B-840 is one of the most expensive grinding machines in existence — only justifiable for high-volume production of large aerospace turbine blade families
The machine's extreme optimization for aerospace turbine blade production makes it unsuitable and overspecified for any other grinding application — it is a pure specialist platform
Linear motor and active thermal management systems require United Grinding specialized service expertise — field maintenance and breakdown support is not available from general machine tool technicians

Best For

Aerospace engine OEMs and Tier 1 suppliers producing large turbofan and turboprop blades, compressor blades, and vane assemblies in production quantities where cycle time and first-article yield are contractually measured NADCAP-certified aerospace grinding cells where process traceability, active thermal control, and closed-loop gauging are audit requirements for flight-critical special processes Precision aerospace subcontractors building dedicated turbine blade grinding cells with robot loading and unloading for multi-shift, minimally-attended production operation Defense prime contractors producing large military turbine and compressor blades under strict OEM qualification specifications where positional repeatability is contractually specified

Frequently Asked Questions

01 What is the difference between the MGC-B and MGC-L series?

Both the MGC-B and MGC-L are Mägerle creep-feed grinding platforms with linear motor drives. The MGC-B (Blade) series is optimized specifically for turbine blade root form and profile grinding, with the 840 designation indicating the longer table travel. The MGC-L uses a larger general-purpose linear table configuration. In practice, the MGC-B-840 is selected for dedicated blade production lines where the longer travel and blade-specific grinding software optimization matter; the MGC-L is more frequently deployed for diverse aerospace component families.

02 Why does the MGC-B-840 use 55 kW of spindle power?

High-removal-rate creep-feed grinding of turbine blade root forms on Inconel 718 and titanium alloys requires substantially more power than conventional surface grinding. Creep-feed grinding takes full-depth material removal in a single slow pass, so the grinding power is concentrated in one cutting arc — demanding high continuous spindle power to prevent stalling. The 55 kW spindle enables infeed rates and MRR values that are simply not achievable on 30–37 kW machines, reducing blade root form cycle times by 30–50% for comparable geometries.

03 How does Mägerle's active thermal management work on the MGC-B-840?

The MGC-B-840 monitors temperature at multiple points — machine bed, spindle housing, coolant supply, and ambient air — continuously during operation. A thermal model in the Siemens 840D sl CNC software predicts the effect of temperature changes on each axis position and applies real-time compensation offsets. Additionally, the machine bed temperature is actively controlled (not just monitored) to minimize the thermal gradient that drives dimensional drift. This prevents the grinding gap from drifting by more than ±0.5 µm during a full production shift.

04 What turbine blade materials can the MGC-B-840 grind?

The MGC-B-840 is designed for the full range of aerospace turbine alloys: Inconel 718, Inconel 625, Waspaloy, René 80, René 125, titanium 6Al-4V, titanium aluminide (TiAl), and nickel-cobalt superalloys used in high-pressure turbine and compressor stages. Vitrified CBN wheels are most common for production grinding of nickel superalloys; diamond wheels are used for titanium aluminide. Mägerle's grinding software includes material-specific default parameters for each alloy family.

05 How is the MGC-B-840 typically deployed in production?

Most MGC-B-840 installations are in dedicated turbine blade grinding cells with robot loading and unloading, automatic pallet transfer, in-process gauging, and automatic wheel dressing. The robot loads raw blade blanks from a queue pallet, the machine runs through roughing, semi-finish, and finish grinding with automatic wheel changes, the in-process gauge verifies the final profile, and the robot unloads acceptable parts to a finished pallet. A fully configured cell of this type typically requires two to three people per shift to manage dozens of machine centers.