A microscope focusing mechanism where the rack is a track with teeth and the pinion is a gear that travels up and down the track. By turning a focus knob, the microscope moves closer or further away from the specimen.
term used to describe the gear system for lowering and raising the stage or barrel when focusing. The coarse adjustment control (knob), usually moves the barrel or stage.
a type of steering setup. As the name implies, rack and pinion steering consists of two major components, a rack and a pinion. The rack, also known as a steering rack, is a long piece of metal that is flat on at least one side. The flat side contains teeth running the length of the rack. The teeth are cut perpendicular to the edges of the rack, meaning they run side by side from one end of the rack to the other, like teeth in a smile. The pinion, or more correctly, the pinion shaft, is a round rod that also has teeth on it, although these teeth run parallel to the length of the shaft, not lengthwise as on the rack. The pinion shaft comes into the rack at a ninety-degree angle, held in place by a collar, and the teeth on the pinion mesh with the teeth on the rack. The pinion is connected directly to the steering column, so when the steering wheel is turned to the left, for instance, the pinion rotates counter-clockwise (from the driver's perspective). The rotary motion of the pinion is changed to transverse motion by the rack. The rack moves to the right, making the wheels go left.
A system of railway traction in which a toothed wheel which is part of a locomotive's transmission, engages with a rack laid between or alongside the running rails. See also: Fell System, Funicular Railway.!-- google_ad_client = "pub-8826792545718317"; google_ad_width = 468; google_ad_height = 60; google_ad_format = "468x60_as"; google_ad_channel ="0630871714"; google_page_url = document.location; google_color_border = "666666"; google_color_bg = "FFFFF7"; google_color_link = "333333"; google_color_url = "006600"; google_color_text = "999999"; //-- Radial Truck A single-axle truck in which axle side-play is imparted by curved guides in such a way that the axle is always normal to the curve which the vehicle is traversing.
A very common set of gears designed to convert rotary motion to straight-line motion. The round gear is the pinion and the straight gear is the rack.
a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
a pair of (A toothed wheel that engages another toothed mechanism in order to change the
a pair of gear s which convert rotational motion into linear motion
a special gear mechanism that produces linear motion from rotary motion, or vice versa
A system using two gears, one round, one flat to move a part, an example would be a drill press, a round gear connected to a handle works with a flat gear on the column to raise and lower the table.
A type of automotive steering system using a pinion gear attached to the end of the steering shaft. The pinion meshes with a long rack attached to the steering linkage.
Rack and pinion drive converts rotary motion into linear motion (or vice versa) by a toothed wheel engaging a matching rack. Some very early locomotives used this system before it was realised that, except on very steep gradients, the weight of the locomotive provided adequate adhesion. But the system is necessary on some mountain railways.
The rack is a track with teeth and the pinion is a gear that rides on the teeth. By turning a knob, the pinion gear moves along the rack. These systems are used in focusing mechanisms, in Abbe condenser focusing systems, and on mechanical stages to move the slide around.
A type of steering assembly that has a gear or pinion at one end of the steering shaft engaging a horizontal-toothed bar or rack having tie rods at either end that are attached to the steering arms.
A mechanical device consisting of a toothed metal bar (the rack) and a small meshing gear wheel (the pinion).
A rack and pinion is a pair of gears which convert rotational motion into linear motion. The circular pinion engages teeth on a flat bar - the rack. Rotational motion applied to the pinion will cause the rack to move to the side, up to the limit of its travel.