Fellows 10-4 / 20-4 Series

The Global Standard in Gear Shaping Precision

🎯 What is it used for?

Internal Gears: The primary tool for cutting internal splines and teeth.
Cluster Gears: Machining gears where a larger diameter prevents “Hobbing”.
Versatility: Perfect for small to medium batches of complex gear profiles.

🌟 Iconic Manufacturers

Top-tier workshops prioritize these brands for their rigidity:

• Fellows (USA): The pioneer (10-2, 10-4, and 20-4 models).

• Lorenz (Germany): High-precision European engineering.

• Liebherr: Advanced CNC shaping centers.

• Mitsubishi: Fast and reliable Japanese gear shapers.

Technical Overview

The Fellows 10-4 is a world-renowned gear shaper designed for accuracy and high metal-removal rates. Unlike hobbing, the shaping process uses a reciprocating cutter that mimics the mating gear’s movement. This makes it indispensable for cutting gears with shoulder interference or internal teeth where a hob cannot reach. Its mechanical simplicity combined with heavy-duty casting ensures decades of reliable service in aerospace and automotive gear production.

Technical Specifications (Fellows 10-4)

Parameter	Technical Details
Max. Pitch Diameter (External)	254 mm (10 inches)
Max. Pitch Diameter (Internal)	254 mm (10 inches)
Maximum Face Width	101.6 mm (4 inches)
Maximum Diametral Pitch	4 DP (Module 6.3)
Stroking Speed	Up to 800 SPM (Strokes per minute)
Machine Total Weight	approx. 5,100 kg

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