Bridgeport 28025716 Speed Changer Shaft Milling Machine

Product Description

The BRIDGEPORT 28025716 is a replacement speed changer shaft designed for use in BRIDGEPORT milling machines. This shaft is a mechanical drive component that transfers rotational motion within the speed-change assembly, allowing the operator to select the correct spindle RPM range for a given cutting application. It is an OEM-style replacement part intended for installation by qualified machine tool technicians or maintenance professionals performing drivetrain service on the 2J-Head Back Gear assembly. Proper function of this shaft is critical to smooth gear engagement and accurate speed selection during milling operations.

This speed changer shaft is specifically designed for use with I Series BRIDGEPORT milling machines equipped with the 2J-Head Back Gear configuration. It is a common service part addressed during scheduled maintenance or unplanned drivetrain repairs on knee mills found in job shops, tooling facilities, and industrial maintenance departments. When the existing shaft shows wear, damage, or gear engagement issues, this direct-replacement part restores proper mechanical function to the head assembly.

Key Features

• Direct replacement speed changer shaft for BRIDGEPORT milling machines
• Compatible with 2J-Head Back Gear configuration
• Designed for I Series BRIDGEPORT milling machines
• Sold individually as a single-unit replacement component
• OEM-style fitment supports accurate spindle speed selection

Compatibility

Designed for use with BRIDGEPORT I Series milling machines equipped with the 2J-Head Back Gear assembly.

Installation Notes

Installation should be performed by a qualified machine tool technician or industrial maintenance professional. Before beginning any drivetrain disassembly, power down the machine completely and lock out the main disconnect in accordance with applicable LOTO procedures. Refer to the BRIDGEPORT service manual for head disassembly sequence before removing or installing the speed changer shaft. Do not force the shaft into engagement with mating gear components, as improper seating can cause premature wear or gear damage.