EMAG G 500 H

$900,000 - $1,300,000 Updated 2026-03-19

Key Specifications

Max Workpiece ⌀

500 mm (19.5 in)

max workpiece length

1,250 mm (49 in)

max workpiece weight

350 kg (771.5 lb)

module range

tool spindle power

kWhp

grinding spindle speed

32,500 RPM max

Overview

The EMAG G 500 H is a large-capacity CNC gear profile grinding machine designed for high-precision finishing of external and internal gears, trapezoidal screws, crown gears, worms, rotors, and screw-type workpieces with diameters up to 500 mm (19.5 in) and modules from 0.5 to 22.0 mm. As the largest machine in EMAG's G-series gear grinding lineup, the G 500 H targets the heavy-duty gear grinding applications found in wind energy, marine propulsion, mining, oil and gas, and large industrial gearbox production.

The tool spindle delivers 20 kW (27 hp) with speeds up to 32,500 RPM, accommodating ceramic grinding wheels from 30 mm to 360 mm (1 to 14 in) diameter across five standard external grinding spindle options and four internal grinding spindle options. This extensive spindle library enables the G 500 H to handle everything from large external spur gears with full-size wheels to tight internal gear bores with small-diameter wheels — all on a single machine platform.

The machine accommodates workpiece lengths up to 1,250 mm (49 in) with maximum workpiece weight of 350 kg (771.5 lb), covering the full range of large gear shaft, rotor, and worm grinding applications. Center distance from work spindle to tool spindle ranges from 20 mm to 445 mm (1 to 17.5 in), providing the reach needed for both small internal gears and large external gear geometries. At 15,000 kg (33,069 lb), the G 500 H provides the mass and thermal stability required for precision grinding at this scale.

The G 500 H supports external spur and helical gears, trapezoidal screws, crown gears, shafts, worms, rotors, and screw-type workpieces, with optional capability for internal gear grinding. For manufacturers producing large, high-value gears where precision profile grinding is essential for achieving the required quality grades, the G 500 H represents the pinnacle of EMAG's gear grinding technology — offering the capacity, flexibility, and precision needed for the most demanding gear finishing applications in heavy industry.

Full Specifications

Parameter	Value
Max Workpiece Diameter	500 mm (19.5 in)
Max Workpiece Length	1,250 mm (49 in)
Max Workpiece Weight	350 kg (771.5 lb)
Module Range	mm
Tool Spindle Power	kWhp
Grinding Spindle Speed	32,500 RPM max
Ceramic Wheel Diameter	mmin
Center Distance	20 - 445 mm (1 - 17.5 in)
External Spindle Options	5 standard configurations
Internal Spindle Options	4 configurations (optional)
Gear Types	External/internal spur, helical, trapezoidal screws, crown gears, worms, rotors
Machine Weight	15,000 kg (33,069 lb)
Workpiece Dia Max	mmin
Workpiece Length Max	mmin
Centre Dist Work Spindle Tool Spindle	mmin
Grinding Spindle Speed Max	rpm
Workpiece Weight Max	kglb
Machine Weight Including Standard Equipment	kglb

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

Strengths & Limitations

Strengths

500 mm diameter and module 22 capacity handles the largest gear profile grinding applications in wind energy, marine, mining, and heavy industrial sectors
32,500 RPM spindle speed with wheels from 30 to 360 mm diameter provides unmatched flexibility from small internal gears to large external gears
Five external and four internal spindle options enable configuration for virtually any gear grinding application on a single platform
1,250 mm workpiece length accommodates long worm shafts, rotor profiles, and large gear shafts common in heavy-duty power transmission
Profile grinding capability handles non-standard gear forms including crown gears, trapezoidal screws, and cycloid profiles that generating grinders cannot produce
15,000 kg machine mass provides the thermal stability and vibration damping required for precision grinding at this scale

Limitations

Profile grinding of large gears is inherently time-consuming — each tooth gap is ground individually, resulting in long cycle times for high tooth-count gears
15,000 kg machine weight requires substantial foundation engineering and may limit placement options in existing facilities
High acquisition cost reflects the machine's large-capacity construction and extensive spindle configuration options
Setup complexity for different workpiece types requires experienced gear grinding operators, especially for non-standard profiles

Best For

Wind energy gearbox manufacturers profile grinding large planet gears, ring gears, and sun gears to DIN 3-5 quality after case hardening Marine propulsion gear builders finishing large reduction gear sets for ship drives and submarine power trains Mining and heavy equipment manufacturers grinding large-module drive gears for crushers, mills, and excavation equipment Worm gear and screw producers finishing precision worm profiles and trapezoidal lead screws for machine tool and industrial applications Aerospace and defense manufacturers grinding large, high-value gear components where profile grinding is specified for quality assurance

Frequently Asked Questions

01 Why does the G 500 H offer so many spindle options?

The wide range of gear types and sizes handled by the G 500 H requires different spindle configurations for optimal grinding performance. Small internal gears need compact, high-speed spindles with small wheels. Large external gears need powerful spindles with large wheels. By offering five external and four internal spindle options, EMAG enables each G 500 H to be configured precisely for its intended application range while maintaining the flexibility to handle diverse workpieces.

02 Can the G 500 H grind both internal and external gears?

Yes, with the optional internal grinding spindles, the G 500 H handles both external and internal gears. Internal grinding uses smaller wheels (down to 30 mm diameter) at high spindle speeds (up to 32,500 RPM) to reach inside gear bores. This dual capability is valuable for manufacturers producing both ring gears (internal) and pinions (external) for planetary gear assemblies.

03 How does the G 500 H compare to the G 375 H?

The G 500 H extends maximum workpiece diameter from 375 mm to 500 mm, workpiece length from 870 mm to 1,250 mm, and module range from 15 to 22. The G 500 H also offers more spindle configuration options and higher maximum spindle speed (32,500 vs 18,000 RPM). The G 500 H is the correct choice when workpiece size, weight, or module requirements exceed the G 375 H's capacity.

04 What surface finish quality can the G 500 H achieve on large gears?

The G 500 H achieves gear flank surface finishes of Ra 0.2-0.4 micrometers in standard profile grinding mode, with Ra 0.1 micrometers achievable with superfinishing passes. For large wind energy and marine gears where surface finish directly impacts efficiency, noise, and fatigue life, these surface quality levels are essential for meeting modern gearbox specifications.