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The Bridgeport logo as cast into the head of a Bridgeport Knee Mill. The patented "2J" head ensures that any heat buildup in the spindle bearings, belt, or quill area is kept to an absolute minimum. This results in increased belt and bearing life as well as consistent accuracy with no external cooling fans required, increasing rigidity and ...
Barden Corporation is a ball bearing manufacturer based in Danbury, Connecticut, USA with factories in Danbury, Winsted, Connecticut and in Plymouth, England.It previously had factories in Bridgeport, Connecticut (Lacey Manufacturing-divested in 2008) [1] and Haverhill, Massachusetts (Pope Spindle-divested in 2003).
First is the spindle concept itself, which constrains workpiece or tool movement to rotation around a fixed axis. This ancient concept predates machine tools per se; the earliest lathes and potter's wheels incorporated it for the workpiece, but the movement of the tool itself on these machines was entirely freehand.
In machine tools, a spindle is a rotating axis of the machine, which often has a shaft at its heart. The shaft itself is called a spindle, but also, in shop-floor practice, the word often is used metonymically to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it (chuck, etc.).
Such bearings should be equipped with the shaft position control system, which adjusts the fluid pressure and consumption according to the rotation speed and shaft load. [4] In fluid-dynamic bearings, the bearing rotation sucks the fluid on to the inner surface of the bearing, forming a lubricating wedge under or around the shaft.
Cyrus Hall McCormick patented an early mechanical reaper. 1900 ad for McCormick farm machines—"Your boy can operate them" 1921 International Harvester Model 101 on display at the Iowa 80 Trucking Museum, Walcott, Iowa. 1925 International Model 63 Street-Washing Truck on display at the Iowa 80 Trucking Museum, Walcott, Iowa.
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