Fellows No.7 High Speed Gear Shaper TRT#76

Description

Fellows Gear Shaper Co. of Springfield, Vermont were the pioneers of the gear shaping process. The 7-Type was their compact high-production machine, designed specifically for high-speed operation and capable of cutting spur and helical gears with consistent accuracy. These machines had a long production run from the early 1940s through the 1950s across several sub-models, and they built a strong reputation in production gear cutting environments.

The gear shaping process works by synchronising a reciprocating cutter — which has teeth the same profile as the desired gear — with the slowly rotating workpiece. The cutter strokes up and down while both cutter and workpiece rotate in unison, progressively cutting to full depth before completing one or more finish passes. The result is accurate, repeatable gear cutting suited to both spur and helical forms.

Typical Specifications:

• Max pitch diameter (spur & helical external): 178 mm (7″)
• Max face width: 38 mm (1.5″)
• Max helix angle: 45°
• Cutter strokes per minute: 200–450 SPM
• Power requirements 3 phase 415 volt
• Approximate weight: 1,500 kg (3,300 lbs)
• Approximate dimensions: 1,150 x 1,040 x 2,000 mm H (3’9″ x 3’5″ x 6’6″ H)