EMAG G 375 H
Key Specifications
Max Workpiece ⌀
max workpiece length
max workpiece weight
module range
max profile depth
tool spindle power
Overview
The EMAG G 375 H is a CNC gear profile grinding machine designed for high-precision finishing of external and internal gears, worm gears, crown gears, rotors, and screws with workpiece diameters up to 375 mm (15 in) and modules from 0.5 to 15.0 mm. Unlike generating grinders that use threaded wheels to form all teeth simultaneously, the G 375 H uses a profiled grinding wheel to finish one tooth gap at a time, enabling production of gear forms that generating grinding cannot handle — including asymmetric profiles, cycloid gears, and non-involute tooth forms.
The tool spindle delivers 23 kW (31 hp) with speeds up to 18,000 RPM, accommodating ceramic grinding wheels from 40 mm to 360 mm (1.5 to 14 in) diameter. This wide wheel diameter range enables the G 375 H to handle everything from fine-pitch internal gears using small wheels to large external spur gears using full-size wheels. The machine accommodates workpiece lengths up to 870 mm (34.5 in) with maximum workpiece weight of 350 kg (771.5 lb), covering the full range of medium-sized gear and rotor grinding applications.
The G 375 H features integrated quality inspection capabilities and short setup times that make it suitable for both production runs and small-lot work. The machine supports asymmetric profile grinding and cycloid gear production through precision coordinate input, enabling specialized gear forms used in robotics, pump drives, and high-efficiency power transmission applications. External and internal gear grinding from a single machine eliminates the need for separate internal and external grinders.
The Siemens SINUMERIK 840D sl control manages the complex profile grinding process including wheel dressing, in-process gauging, and automatic compensation for wheel wear. At 11,000 kg (24,251 lb) with standard equipment, the G 375 H provides the mass and thermal stability needed for achieving the tight tolerances and surface finishes demanded by precision gear applications. For manufacturers requiring profile grinding flexibility across diverse gear types and geometries, the G 375 H delivers capabilities that no generating grinder can match.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 375 mm (15 in) |
| Max Workpiece Length | 870 mm (34.5 in) |
| Max Workpiece Weight | 350 kg (771.5 lb) |
| Module Range | mm |
| Max Profile Depth | 35 mm (1.5 in) |
| Tool Spindle Power | kWhp |
| Grinding Spindle Speed | 18,000 RPM max |
| Ceramic Wheel Diameter | mmin |
| Center Distance | 35 - 340 mm (1.5 - 13.5 in) |
| CNC Control | Siemens SINUMERIK 840D sl |
| Machine Weight | 11,000 kg (24,251 lb) |
| Gear Types | External, internal, worm, crown, rotors, screws |
| Workpiece Dia Max | mmin |
| Workpiece Length Max | mmin |
| Profile Depth 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
- Profile grinding handles gear forms that generating grinders cannot — asymmetric profiles, cycloid gears, worm gears, crown gears, and non-involute tooth forms
- Grinds both external and internal gears on a single machine, eliminating the need for separate internal and external grinding equipment
- 23 kW spindle with 18,000 RPM and wheel range from 40 to 360 mm provides exceptional flexibility across fine-pitch to large-module applications
- Module range of 0.5-15.0 mm spans automotive fine-pitch gears through medium-module industrial and aerospace gearing
- Integrated quality inspection with short setup times supports both production grinding and small-lot specialty work
- 870 mm workpiece length accommodates long worm shafts, rotor profiles, and splined shafts
Limitations
- Profile grinding is inherently slower than generating grinding for standard involute gears — one tooth gap at a time versus all teeth simultaneously
- 375 mm diameter limit excludes large industrial gears — the G 500 H is required for larger workpieces
- 11,000 kg machine weight requires substantial foundation preparation for proper installation
- Higher complexity of profile grinding setup and programming demands experienced gear grinding operators
Best For
Frequently Asked Questions
01
Generating grinding uses a threaded (worm-shaped) grinding wheel that meshes with the gear in a generating motion, forming all teeth simultaneously. Profile grinding uses a single-rib wheel shaped to the exact tooth gap profile, grinding one gap at a time with the workpiece indexing between gaps. Profile grinding is slower but can produce any tooth form — the wheel is dressed to the required profile. The G 375 H is a dedicated profile grinder.
02
Yes, the G 375 H grinds both external and internal gears. For internal gears, smaller-diameter grinding wheels (down to 40 mm) are used to reach inside the bore. The 18,000 RPM spindle speed maintains effective peripheral grinding speed even with these small wheels. This dual capability eliminates the need for separate internal and external gear grinding machines.
03
The G 375 H achieves DIN 2-4 (AGMA 13-15) quality on standard involute profiles, and comparable precision on specialty profiles where standard quality grades do not apply. Surface finishes of Ra 0.2-0.4 micrometers are standard, with Ra 0.1 achievable under optimized conditions. The integrated quality inspection system verifies results in-process.
04
Yes, cycloid gear production through precision coordinate input is a specific capability of the G 375 H. Cycloid gears used in robot joint reducers require non-involute profile grinding that only profile grinding machines can perform. The G 375 H's combination of profile grinding capability, small wheel access for internal profiles, and high-precision control makes it well suited for this growing application.
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