Bridgeport 12190850 Worm Gear Adjustable Shaft Milling Machine

Product Description

The BRIDGEPORT 12190850 is a worm gear adjustable shaft replacement part designed for use in Bridgeport milling machines. This component is part of the lower housing assembly on 2J and J-Head style machines and is responsible for transmitting rotational motion through the worm gear drive mechanism, enabling precise spindle speed adjustment. It is sourced as a direct OEM-style replacement and is installed by machine tool technicians or skilled maintenance professionals performing drivetrain service or rebuilds on vertical knee mills.

This adjustable shaft is used in the 2J and J-Head lower housing configuration found on I Series Bridgeport milling machines. It is a common wear or damage replacement during overhaul of the variable speed head assembly. Shops running production environments or restoring older knee mills will encounter this part during standard drivetrain maintenance. Installation typically occurs as part of a larger head teardown and reassembly procedure rather than a standalone swap.

Key Features

• OEM-style worm gear adjustable shaft for precise fitment in the lower housing assembly
• Compatible with 2J and J-Head lower housing configurations
• Designed specifically for I Series Bridgeport milling machines
• Direct replacement for worn or damaged drivetrain components in vertical knee mills
• Sold individually, allowing single-unit replacement without excess inventory

Compatibility

Designed for use with I Series Bridgeport milling machines equipped with 2J and J-Head lower housing assemblies. Verify lower housing configuration before ordering to confirm fitment.

Installation Notes

Installation should be performed by a qualified machine tool technician or maintenance professional familiar with milling machine drivetrain assemblies. Disconnect and lock out all electrical power to the machine before disassembling the head or lower housing. Refer to the Bridgeport service manual for the correct disassembly and reassembly sequence for the lower housing and worm gear drive. Improper reassembly of the worm gear mechanism can result in inaccurate spindle speed control or component damage.