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The rack and pinion mechanism is used in rack railways, where the pinion mounted on a locomotive or a railroad car engages a rack usually placed between the rails, and helps to move the train up a steep gradient. It is also used in arbor presses and drill presses, where the pinion is connected to a lever and displaces a vertical rack (the ram).
Arbor presses can be mounted on a work bench, wall, or pedestal. The base is usually constructed of cast metal. A ram provides the force; it may be square or round. The ram is usually driven by a rack and pinion. Higher force arbor presses have a further gear reduction. [1] Forces are usually generated by manual or hydraulic input. [2]
Drill presses can be divided into two main types depending on their construction: Column drill press is a common type characterized by the fact that the drill spindle can be moved up and down axially ("along a column"), and has a height-adjustable table, usually adjustable via a rack and pinion.
A drill press Drill press (then called a boring machine) boring wooden reels for winding barbed wire, 1917. A drill press (also known as a pedestal drill, pillar drill, or bench drill) is a style of drill that may be mounted on a stand or bolted to the floor or workbench. Portable models are made, some including a magnetic base.
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A rack is a toothed bar or rod that can be thought of as a sector gear with an infinitely large radius of curvature. Torque can be converted to linear force by meshing a rack with a round gear called a pinion: the pinion turns, while the rack moves in a straight line.