A rack and pinion mechanism is utilized to transform rotary movement into linear movement and vice versa. A round spur gear, the pinion, meshes with a spur equipment which has teeth set in a straight range, the rack. Rack and pinion gears are used to convert rotation into linear movement. An ideal example of this is actually the steering program on many vehicles. The tyre rotates a equipment which engages the rack. As the gear turns, it slides the rack either to the right or left, based on which way you convert the wheel.
A rack and pinion program gives the ability to transfer rotary to linear movement, with all the accuracy Spur Gear Rack expected of a geared program.
The racks are manufactured from ground, hardened stainless or ground stainless and available with a selection of accuracies, pitches, and lengths, plus the facility to provide modifications such as flats, journals or custom ends. Hobbed stainless and brass racks are also available. The rack pinions are plain or anti-backlash, also with a choice of accuracies, pitches, bore sizes, alternative components and coatings.
Ground rack can be used for both measurement and actuation. In general the smaller pitches (1 mm) fit measurement as small pinion diameter gives higher linear resolutions. The larger pitches (2 mm and 2.5 mm) allow for an increased load capacity. For most applications the rack can be used for both the feedback and the actuation; yet, in very precise applications it is best to us a non-drive portion of the rack for feedback, alternatively a separate rack may be used. Hobbed rack are more suitable for light actuation applications where price is a key consideration.
You can expect three types of rack – rectangular, solid round and tubular rack. Rectangular rack are utilized when the application requires the rack to be stationary and the rack pinion supplies the element of movement. Our rectangular racks are used with a engine, slide and carriage for instance in the printing market for the actuation of paper cutting knives in a printing press. Round rack certainly are a more flexible alternative, in regards to to mounting, used for instance in XY phases. The tubular racks enable the passage of liquids, fibre-optics, gasses etc, producing them well suited for medical and scientific applications, such as for example laboratory automation pick and place mechanisms.
Round racks are perfect for linear actuators in accurate automation applications . Tubular racks are specially useful for medical and scientific applications, where in fact the hollow shaft permits the passage of fluids, fibre optics and gases.