Gleason 350GMS CNC Gear Grinding Machine

$800,000 – $1,500,000 Updated 2026-03-17

Key Specifications

Maximum Workpiece Diameter

350 mm (13.8 in)

Maximum Module

Maximum Face Width

350 mm (13.8 in)

Grinding Wheel Speed

Up to 63 m/s

Number of CNC Axes

Gear Quality

AGMA 13 / DIN 3

Overview

The Gleason 350GMS is a CNC generating gear grinding machine designed for high-quality production of cylindrical external and internal spur and helical gears up to 350 mm diameter. Gleason, headquartered in Rochester, New York, is the world's largest manufacturer of gear production equipment, and the 350GMS reflects decades of grinding expertise in a compact, highly automated package. The machine uses continuous generating grinding with profile-dressed CBN or aluminum oxide wheels and features in-process and post-process gear measurement integrated into the grinding cycle, enabling closed-loop quality control without removing parts to an inspection room. The 350GMS achieves AGMA 13 / DIN 3 gear quality, suitable for automotive transmissions, industrial gearboxes, and aerospace reduction gear sets. Integrated dressing of the wheel with a diamond dresser maintains wheel form between batches, enabling lights-out production with minimal operator intervention. An integrated gantry loader interface accommodates automatic part loading for high-volume production.

Full Specifications

Parameter	Value
Maximum Workpiece Diameter	350 mm (13.8 in)
Maximum Module	6
Maximum Face Width	350 mm (13.8 in)
Grinding Wheel Speed	Up to 63 m/s
Number Of CNC Axes	5
Gear Quality	AGMA 13 / DIN 3
Grinding Method	Continuous generating grinding
Wheel Dressing	Integrated CNC diamond dresser
Measurement	In-process and post-process gear gauging
Automation Interface	Gantry loader ready
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Manufacturer	Ermak
Model	Fibermak
Capacity	90,000 kg

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

Strengths & Limitations

Strengths

Integrated in-process gear measurement enables closed-loop grinding without offline CMM
AGMA 13 / DIN 3 quality suitable for automotive and aerospace power transmission
Gleason's global service and applications support network
Automated wheel dressing maintains wheel geometry throughout production runs
Gantry loader interface for full automation in high-volume cells

Limitations

Very high capital investment — typically justified only for dedicated production lines
350 mm diameter limits to medium gears; large industrial gears need larger machines
DIN 3 quality specification demands extremely precise machine setup and maintenance
Long delivery times common for customized configurations

Best For

Automotive transmission manufacturers producing clutch pack and planetary gears Aerospace gearbox manufacturers requiring AGMA 13 precision Wind turbine gearbox producers running high-volume grinding Marine propulsion gear manufacturers needing DIN 3 quality

Frequently Asked Questions

01 What is the difference between generating grinding and profile grinding?

Generating grinding uses a worm-shaped grinding wheel that rolls in continuous mesh with the workpiece gear, producing the involute profile through kinematic synthesis. Profile grinding dresses the wheel to match the exact gear tooth form and plunges directly. Generating grinding is faster for production volumes; profile grinding is more flexible for small batches.

02 Does the 350GMS grind internal gears?

Yes. The machine grinds both external and internal spur and helical gears within its diameter and face width limits.

03 What abrasive wheel types does the 350GMS use?

The machine uses vitrified CBN grinding wheels for high-speed production of hardened steel gears, and aluminum oxide wheels for lower-volume applications. CBN wheels offer dramatically longer life between dresses.