Everything to Know About CNC Rack and Pinion Parts

April 20, 2021

Rack and Pinion System Made Easy

We use the CNC Rack and Pinion Parts for a number of different functionalities. The energy produced by most of the motors is in the form of rotatory motion, and this motion needs to be converted into linear motion to be used properly. Take the example of a car. Whenever we need to turn it left or right, we rotate the steering wheel, but our intention is not to rotate the car. Rather, we want to turn the car either right or left.

Take another example of the canal doors. Whenever we need to close or open them, we rotate a wheel, and they get opened or closed according to the requirements. But how is this done? How is the rotatory motion converted into linear motion? The answer to this is the use of a simple machine called the rack and pinion system.

In this blog, we will go through Rack and pinion’s basic knowledge so that the reader can develop an understanding of the system in the easiest possible way. So let’s start.

cnc rack and pinion parts

Design of Rack, and Pinion System:

This gear system is used in various types of machinery at the industrial level. But here, we will discuss the design of the system in a vehicle. The whole system consists of a steering wheel at the top that controls the energy provider.

The steering wheel is connected with a long steering column. Inside the steering column, a steering shaft is present. At the bottom of the steering shaft, a pinion is present. A pinion is a round wheel that has many teeth. Rack is present under the pinion as a platform. It also has teeth. The teeth of both the Rack and pinion are interlinked. The Rack has tie rods attached at both of its ends.

The tie rod’s inner end is attached to the Rack, and its outer end is attached with the steering knuckle. A steering knuckle, in turn, drives the wheel in the required direction.

Working Principle:

The working principle of the Rack and pinion system is elementary. The energy source turns the steering wheel in a circle that rotates the steering column. The steering shaft that is present inside the column is connected to the pinion.

The pinion with the provided energy starts moving on the Rack. The Rack also starts moving back and forth. This energy is then transferred to the outer tie rod that transfers the energy to the knuckles. These knuckles then turn the wheels either in the left or the right direction.

Rack and Pinion VS the Linear Motors

Best Gear System:

In the perspective of the engineering machinery, Rack and pinion gear system are the oldest one as it was used in the railways and elevators in even the 18th century. So one might consider them as old and dated machinery.

Still, the reality is the opposite: the recent developments in technology have made this system better than ever. Helical Rack and pinion are some of the best gear systems.


At the industrial level, both Rack and pinion and the linear motors are in use. But most of the industrial machinery experts will tell you that the Rack and pinion are better in all regards. First of all, is the simplicity of this system.

It is a straightforward machine that consists of just a wheel and a platform. Both of these structures are interlinked by their teeth, and they move against each other, while a linear motor consists of a ball-bearing system that cannot be handled with ease in most cases.

Power Consumption:

Yes, linear motors can work at a much higher speed, but one tangible thing is power consumption. A linear motor consumes 5 times more energy than the pinion system. Hence a lot of investment is needed to fulfill these energy requirements, and the industry will need more transformers to keep the linear motors running.

High Speed:

While working at higher speeds, the linear motors get highly heated up. So a secondary cooling system is required that also entails a lot of investment.

The rack and pinion system is also more durable than linear motors. This system keeps working in the machinery for a much more extended period than linear motors. And if due to one reason or the other, the system needs replacement, it can also be done quickly.

Moreover, it also has inbuilt brakes while the linear motors entail investment in that regard also for getting the secondary brakes.

The only investment that racks and pinion demand is that for lubrication. And with only this investment, it provides efficiency up to 97%, while the linear motors offer only 85% efficiency.

Advantages of Rack and Pinion

So why should one choose the gear system under discussion over all the other systems? The answer is simply that it provides many advantages and benefits. Some of them have already been mentioned above, like the simplicity of the machine that makes it simple to use and the X-factor efficiency of this gear system. Some of the other advantages it provides are as under:

  • First of all, the Rack can be of any length you want, and it can have more than one pinions running over it for the performance of the task. The length and number depend upon the machinery and the amount of work required to be done.
  • As the machinery is simple, the Rack and pinion system’s weight is also lower than all the other systems. Here it must be noted that in the formation of racing cars, a mere fluctuation of the weight is given much preponderance, so the rack and pinion system is given preference in the vehicles’ formation. Repairing this system is also easy.
  • Moreover, it is difficult for the system to collapse as there are only two main working parts. However, even if the system fails, then the machinery is so standard that any mechanic can quickly repair it.

cnc rack and pinion parts

Final Verdict:

When it comes to finding the right manufacturer for CNC rack and pinions parts, you will not find a better one than CNC-Parts. They have the latest technology and the best onboard to design and develop the parts that would meet the highest industry standards!