How to Choose the Right Gear Rack and Spur Gear?

Posted on Nov 20, 2020

Gear Rack and Spur Gear

Gears are mechanical transmission elements with teeth that are used to transmit motion and power between machine parts. The gears operate in pairs so that their teeth mesh with the teeth of another corresponding gear or toothed component, thereby preventing slippage during transmission.

The new generation of compact rack and spur gears offers easy-to-install, silent, lightweight, non-lubricated, and soft-handed rack and spur gear drive kits to change equipment or workpiece positioning. Generally, they are suitable for assembly equipment, production workstations, instruments, inspection systems, or other situations that require rapid linear movement.

In the past few decades, the development of engineering plastics and technopolymers has brought spur gears with high mechanical strength, which not only has all the advantages of plastics, such as corrosion resistance and chemical agents but also has high resistance to torsion Performance and good corrosion resistance.

Tensile strength, significant noise reduction effect, and low friction coefficient, even in industries where lubrication is not recommended or even prohibited, rack and spur gear and spur gears can also be used. In this article, we will discuss the different considerations you should make when looking for racks and spur gears.


Rack and Spur Gear Pros and Cons

The most common type of gears employed, spur gears are constructed with straight teeth cut or inserted parallel to the gear’s shaft on a circular gear body. In mated pairs, these gears employ the parallel axes configuration to transmit motion and power. Depending on the application, they can be mated with another spur gear, an internal gear, or a gear rack.

The simplicity of spur gear tooth design can achieve high accuracy and simplify manufacturing. Other characteristics of spur gears include lack of axial load, high speed and high load handling, and high efficiency.

Efficient and easy to assemble rack and spur gear will save you time and minimize downtime, but what about the disadvantages? For example, high-speed noise is caused by backlash and the instantaneous force experienced by the teeth of a gear when it first meshes.

Use gear racks to convert rotary motion into linear motion. The rack and spur gear has teeth cut at right angles, the straight teeth cut into one surface of the rod's square or circular cross-section, and are operated by a spur gear, which is a small cylindrical gear that meshes with the rack and spur gear.

Generally, rack and spur gears are collectively referred to as "rack and spur gear." There are many ways to use gears.


Rack and Spur Gear Considerations

Gear racks and spur gears are used on various mechanical equipment, so there are several different types and designs to choose from. The suitability of each gear for sports or power transmission applications and its precise design depends on the specifications and requirements of the application. Some of the main factors that may be considered when designing and selecting gears include:

Environmental Conditions

The operating and environmental conditions of gear racks and spur gears applications greatly affect the optimal type and design of gears, because these conditions affect the performance and durability of the gears.

Some of the operating conditions that may affect the gear racks and spur gears include the weight applied, the noise and vibration generated, and the friction and stress on the teeth, while some of the environmental conditions that may affect the gear include temperature, humidity, and sanitary conditions.

These conditions affect various gear design factors, including building materials, surface treatments, and lubricant types and lubrication methods.

Gear Construction Material

There are various construction materials for rack and spur gear and spur gears, such as cast iron and steel, fiber, nylon, and stainless steel. Each material has special manufacturing and operating advantages. For example, cast iron is used for its ease of manufacturing and low cost, which makes it suitable for mass or mass production applications that do not require high precision specifications.

Steel, such as carbon steel and alloy steel, is used due to its high hardness and tensile strength, making it suitable for the production of highly durable gears. Nylon is a low-cost material with light weight and non-corrosive properties, making it suitable for mass production and light-load applications.

Gear Surface Treatments

Some surface treatments that can be used for rack and spur gears include grinding and heat treatment. Grinding the surface of gear teeth can reduce the noise generated during operation, increase the force that can be transmitted, and affect the accuracy of gear classification. However, grinding also increases the total production cost.

There are several heat treatment services for gear racks and spur gears, including case hardening, tempering, normalizing, annealing, and carburizing. These processes will affect the performance of the gear material, such as increasing its hardness and strength, which can improve the overall durability and life of the gear.

Gear Lubrication

If gear lubricants are used adequately and appropriately, the stress and fatigue of the gear body and teeth can be prevented or reduced. This extends the overall service life of the gear. However, the best type of lubrication method depends on the requirements and specifications of the application and the type of your gear racks and spur gears.

When selecting a lubricant, consideration should be given to potential lubricant viscosity, load pressure capability, thermal and chemical stability, as well as water separation, defoaming, and corrosion resistance under the operating and environmental conditions of the application.

If the proper lubricant is used, some of the benefits include reducing friction between gear teeth, reducing heat generation, and reducing noise and vibration during operation.

Pressure Angle

The pressure angle determines how the spur gear fits together when it meshes with the rack. In order to work together, the gears must have the same pressure angle.

A gear with a pressure angle of 20 degrees is thicker and stronger than a gear with a pressure angle of 14.5 degrees. Gears with a pressure angle of 14.5 degrees (previous industry standard) are usually found on older machinery.


Rack and Spur Gears on

You can find many CNC rack and spur gear experts on our site that are suitable for gray cast iron processing. Just head to our product section or check out our search function to find hundreds of suppliers in our product database. If you want to learn more gear rack and spur gear related questions and applications make sure to check out our other blog entries.

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