Gear Rack

Gear Rack

 

a bar or rod with gear teeth that engage a pinion or, less frequently, a worm gear, together with which it forms a drive for transforming rotary motion into transla-tory motion or vice versa (rack-and-gear drive). Gear racks are made with spur, helical, herringbone, or circular teeth. In the most frequently used gear drives with involute gearing, the shape of the teeth on the gear rack is rectilinear.

Gear racks are used in gear drives of metal-cutting machine tools and other machines. They are attached by screws and pins to the slide bars, tables, or stands of machine tools and machines. For example, in the drive of the main cutting motion in a planing machine, the gear rack is attached to the table that holds the part being worked; in the lengthwise feed mechanism of a lathe there is a stationary gear rack on the stand, and a pinion is mounted on the movable support with the cutting tool. Sometimes gear racks travel along guides, as in mechanisms for changing speeds on machine tools.

References in periodicals archive ?
An example of this is in the connection of a gear wheel with a gear rack.
The vertical drive is transmitted via a combination of gear rack and belt, whereby strokes ranging from 2,000 to 3,000 mm are available.
The rig also features a breakout system on the rotation unit that uses high-pressure oil and gear rack assistance to effortlessly break rod joints.
The TX-NR636 wins prime position on your gear rack for three reasons.
Another designing variable is the "f" coefficient, which is called coefficient of modification of the gear rack angle.
3] = f--the coefficient of modification the gear rack or racks profile angle [[alpha].
Check moving parts, including gear rack or chain, pivot points, boom locks, wear guides and cam followers.
8 is now using a Longwall Associates Gear Rack haulage system, AFC, stageloader, and crusher.
The gear wheel drives the car by engaging a plastic gear rack installed in the track.
The new machine relies on a cutter shaped like a gear rack that moves in reciprocating motion as the workpiece is indexed through an angle of 360 degrees.