The rack is a mechanical component that converts rotational motion into linear motion—and vice versa—thanks to its teeth, which the gear can engage with.
Machining of Rack Gears
Milling/Gear Cutting
- Module:
- From Module 0.5 to Module 12
Gear racks
A rack is a straight machine component with a series of teeth. When paired with a gear, the teeth of the two components can mesh, creating a drive mechanism that converts rotational motion into linear motion. The reverse conversion—from linear to rotational motion—is also possible. If you’d like to purchase racks, simply provide a rack manufacturer with your specific requirements for the machine component—they will then custom-manufacture it exactly to your specifications.
Applications of Rack-and-Pinion Systems
In the past, vertically oriented racks were primarily used to position objects at different heights. In the home, for example, they were used to regulate the heat in a pot placed over a fire. It was not until the industrial revolution that racks began to be used more widely as machine components.
Today, there are a wide variety of applications for this machine component. Overall, however, it is primarily used when large axial forces are at work, since it maintains the same stiffness along its entire length. Perhaps its best-known application is in mountain rail technology: In rack-and-pinion railways, the rack serves as a toothed rail that runs parallel to the tracks and provides the drive. This has made it possible to transport people from the foot of a mountain to its summit since the mid-19th century. Aside from that, rack-and-pinion drives are also used in everyday life, often without us even realizing it. In electronic devices such as CD or DVD players or computer drives, they are used to generate the drive mechanism. They are also primarily used as steering gears in passenger cars. Depending on the gear tooth geometry, either a variable or constant gear ratio is possible here.
Types of Rack-and-Pinion Systems
Anyone looking to purchase a rack can choose between round or square racks, with straight or helical teeth, made of plastic or stainless steel. Rack manufacturers can also produce this machine component in various degrees of hardness: Whether the component should be soft, hardened, nitrided, or through-hardened depends entirely on the intended load. Furthermore, the angle of engagement of the teeth, the pitch, and the module can be varied. Pitch refers to the distance between two teeth; the module (a measure of the teeth’s size), in turn, is calculated by dividing the pitch by the mathematical constant pi. The rack and pinion, which are designed to mesh, must have the same module, pitch, and angle of engagement. Otherwise, those looking to purchase racks can generally communicate their specific requirements to the manufacturer on an individual basis.
Rack Gears from Ringhoffer
Rack manufacturers have various options for machining this machine component. At Ringhoffer, we use milling or tooth-flank grinding in our manufacturing process. Both machining methods allow for modules ranging from 0.5 to 12, or pitch from 2 to 10 millimeters. The maximum length of a single piece is 3,000 millimeters, but other lengths are available upon request.
The machining parameters are identical here for both milling and tooth-flank grinding, but there are differences in the resulting quality depending on the manufacturing method. Milled racks achieve quality grade 8, whereas ground racks achieve quality grade 6. In total, there are 12 quality grades for gear and rack manufacturing, which are specified in DIN 3961. Grade 1 denotes the finest gear quality, and Grade 12 the coarsest. DIN 3962 also defines additional tolerances.
Buy High-Quality Rack-and-Pinion Systems
If you’re looking to purchase several rack gears—or even just one—there are many manufacturers to choose from. With Ringhoffer, however, you can be sure that you’ll receive a machine component of the highest quality. Our highly qualified manufacturing staff works in a production facility fully equipped with modern CNC milling machines to produce workpieces exactly according to your specifications. For us, quality means processing high-quality materials with the utmost precision to create a top-notch, heavy-duty, and durable machine component. This ensures that, when put into service, it can withstand heavy loads even over the long term.
We are happy to deliver milled components on short notice at any time. Ground components, on the other hand, are produced only upon request. If you are interested, we would be happy to provide you with more detailed information at any time. Whether the rack should be round or square, helical or straight-toothed, and specially hardened is entirely up to you.
