A rack and pinion system is utilized to transform rotary movement into linear movement and vice versa. A round spur equipment, the pinion, meshes with a spur gear which has teeth set in a straight line, the rack. Rack and pinion gears are used to convert rotation into linear motion. An ideal example of this is the steering system on many cars. The steering wheel rotates a gear which engages the rack. As the apparatus turns, it slides the rack either to the right or left, based on which way you convert the wheel.
A rack and pinion system gives the ability to transfer rotary to linear motion, with all the precision expected of a geared program.
The racks are manufactured from ground, hardened stainless steel or ground stainless steel 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 steel and brass racks are also obtainable. The rack pinions are basic or anti-backlash, also with a selection of accuracies, pitches, bore sizes, alternative materials and coatings.
Floor rack can be utilized for both measurement and actuation. Generally the smaller pitches (1 mm) suit measurement as small pinion diameter gives higher linear resolutions. The larger pitches (2 mm and 2.5 mm) enable a higher load capacity. For some applications the rack can be used for both the feedback and the actuation; however in very precise applications it is advisable to us a non-drive portion of the rack for opinions, alternatively another rack may be used. Hobbed rack are more suitable for light actuation applications where cost 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 in combination with a Spur Gear Rack engine, slide and carriage for instance in the printing sector for the actuation of paper cutting knives in a printing press. Circular rack are a more flexible alternative, with regard to mounting, used for example in XY phases. The tubular racks allow for the passage of fluids, fibre-optics, gasses etc, making them perfect for medical and scientific applications, such as laboratory automation choose and place mechanisms.
Round racks are ideal for linear actuators in accurate automation applications . Tubular racks are specially useful for medical and scientific applications, where in fact the hollow shaft allows for the passage of fluids, fibre optics and gases.