Gleason 300 GMS
Key Specifications
Max Workpiece ⌀
machine type
max workpiece height
max workpiece weight
gear types measured
measurement parameters
Overview
The Gleason 300 GMS is a gear metrology system engineered for the precision inspection of large bevel gears, hypoid gears, spiral bevel gears, and cylindrical gears up to 300 mm in diameter. Gleason, headquartered in Rochester, New York, developed the GMS series to bring CMM-level geometric accuracy to the gear inspection process, eliminating the need to route large bevel gears off the production floor to a separate coordinate measuring room. The 300 GMS fills the size gap between the 275 GMS and larger metrology platforms, addressing large bevel gear sets used in truck axles, industrial gearboxes, and helicopter transmission applications.
The machine operates on Gleason's GAMA (Gleason Analytical Measurement Architecture) platform, which integrates a high-accuracy probe head, precision rotary table, and multi-axis CNC positioning system into a unified metrology cell. The 300 GMS measures all standard gear geometry parameters including tooth thickness, runout, pitch, profile, lead, and surface finish in a single clamping. Measurement cycles for a typical 250 mm bevel gear complete in under 10 minutes, dramatically faster than equivalent CMM-based gear inspection. The system supports both bevel gear flank form analysis and cylindrical gear involute inspection.
Gleason's GEMS (Gleason Expert Measurement Software) provides the control and analysis interface, offering gear measurement results in formats compatible with all major gear drawing standards: AGMA, ISO, DIN, and JIS. The software includes statistical process control (SPC) integration, automatic tolerancing against drawing specifications, and graphical flank topography maps that allow immediate identification of systematic grinding or lapping errors. Closed-loop feedback to Gleason grinding and cutting machines is supported, enabling automatic correction of process parameters based on measured deviations.
At roughly $500,000-$750,000 fully configured, the 300 GMS is priced for tier 1 automotive axle manufacturers, helicopter gearbox producers, and large industrial gearbox shops grinding bevel gears in the 200-300 mm OD range. The machine competes primarily with Klingelnberg's P-series gear measuring instruments and Marposs gear inspection systems. For shops that already operate Gleason grinding machines, the closed-loop feedback capability with GEMS software provides a compelling integration advantage.
Full Specifications
| Parameter | Value |
|---|---|
| Machine Type | CNC Gear Metrology System |
| Max Workpiece Diameter | 300 mm (11.8 in) |
| Max Workpiece Height | 250 mm (9.8 in) |
| Max Workpiece Weight | 100 kg (220 lb) |
| Gear Types Measured | Bevel, hypoid, spiral bevel, cylindrical spur and helical |
| Measurement Parameters | Tooth thickness, runout, pitch, profile, lead, flank topography, surface finish |
| Rotary Table Accuracy | ±0.5 arc-second |
| Linear Axis Accuracy | ±0.5 µm (0.5 micron) |
| Probe System | Renishaw REVO or equivalent high-accuracy touch probe |
| Software | Gleason GEMS (Gleason Expert Measurement Software) |
| Standards Supported | AGMA, ISO, DIN, JIS |
| Cycle Time Typical | Under 10 minutes per gear (250 mm bevel) |
| CNC Control | Industrial PC with GEMS interface |
| Machine Weight | 4,500 kg (9,921 lb) |
| Machine Dimensions | 2,400 x 1,800 x 2,200 mm (94 x 71 x 87 in) |
| Brand | GLEASON |
| Model | 300GMS |
| Id | 624143 |
| Type | Gear Testers |
| Year | 2019 |
| Location | United States |
| Stock | 16634160 |
| First Name | Last Name |
| Will You Need Financing | YesNo |
| Yes | No |
| Will You Need Freight Service | YesNo |
Specifications sourced from machinetools.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Measures bevel, hypoid, and cylindrical gears in a single platform — eliminates the need for multiple dedicated inspection machines
- Under-10-minute inspection cycle for 250 mm bevel gears is 3-5x faster than equivalent CMM-based inspection methods
- Closed-loop feedback to Gleason grinding machines via GEMS software enables automatic process correction without manual intervention
- AGMA, ISO, DIN, and JIS standards support means results are immediately usable for customer drawing compliance across all markets
- Flank topography mapping identifies systematic grinding or lapping errors graphically, accelerating root cause analysis
Limitations
- $500K-$750K investment is substantial for shops with lower inspection throughput — ROI requires consistent volume of large bevel gears
- Optimized for gears up to 300 mm — very large bevel gears (ring gears above 300 mm OD) require larger GMS platforms
- Deep integration with Gleason machine ecosystem means closed-loop benefits are reduced in shops running competitive grinding equipment
Best For
Frequently Asked Questions
01
The 300 GMS accommodates workpieces up to 300 mm (11.8 in) in diameter and 250 mm (9.8 in) in height, with a maximum workpiece weight of 100 kg (220 lb). For larger bevel gears, Gleason offers larger GMS platform configurations.
02
Yes. The 300 GMS measures bevel gears (spiral bevel, hypoid, straight bevel), cylindrical gears (spur and helical), and can also inspect worm gears and other gear forms within its size envelope. The GEMS software handles gear geometry definition for all types.
03
The GEMS software compares measured flank topology against the target design and calculates systematic deviations. These correction values are formatted as machine correction files that load directly into compatible Gleason grinding machines, adjusting grinding paths to eliminate the measured error. The feedback loop can significantly reduce iteration time when qualifying a new gear.
04
Both are high-accuracy gear metrology systems used in similar applications. Klingelnberg P-series instruments are well-regarded for bevel gear measurement and are the reference instruments used in many aerospace applications. Gleason GMS systems offer tighter integration with Gleason grinding machines via GEMS closed-loop feedback. Choice often follows the brand of grinding equipment already in the shop.
05
The GEMS software includes tolerance databases for AGMA (American), ISO (international), DIN (German), and JIS (Japanese) gear quality standards. The system automatically compares measured values against the specified tolerance class and generates a compliance report suitable for customer submittal.
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