TECHNICAL SUPPORT
Published 2026-03-07
When playing model airplanes or making robots, one of the most troublesome aspects is installing the steering gear and steering rod. This thing looks inconspicuous, but if it is installed incorrectly, the steering may become inoperable, or the steering gear may become damaged or even lose control. Today we will sit down and talk about this installation method, ensuring that you can get started after reading it and avoid detours.
As the saying goes, if a worker wants to do his job well, he must first sharpen his tools. Before installation, we have to get everything ready. You need to prepare theservo, pull rod, ball head buckle (the small movable round head at both ends of the pull rod), ball head, as well as the matching screwdriver and Allen wrench. It's best to prepare another ruler to adjust the length later.
In addition, it is also important to find a place with good lighting and a flat desktop. Fix the steering gear and put the steering structure of the car in place first. Never work on a messy table. If you lose a small part, it will take you half a day to find it. Only when we are fully prepared can we install it smoothly.
This is a critical step, and many novices fail here. You have to energize theservofirst and bring it back to neutral. Theservowill automatically return to center after most remote controls are turned on. Then, straighten the steering wheel so that it is also in the straight position.
Now, you can measure the distance from the ball head hole on the steering gear swing arm to the ball head hole on the steering wheel steering arm. This distance is the initial length of your tie rod. First loosen the ball buckle on the tie rod, and adjust the length to be similar to the size you measured. It is better to be longer than short, because if it is long, you can screw it in, but if it is short, you cannot make it longer.
The ball head looks simple, but it is exquisite to install. First, the ball head must be screwed into the designated hole position of the steering gear swing arm and steering arm. It must be tightened, but the sliding wire must not be screwed. The kind of ball head with anti-skid pattern, please pay attention to the direction when installing.
The next step is to snap the ball head onto the ball head. Don't be stupid and use brute force to force it. Follow the opening direction of the ball head buckle, tilt it slightly, and then press it hard, and it will go in with a "click". After installing it, pull it with your hands. It should feel smooth and not stuck. ️Keyinspection: After installing it, pull it gently to see if it will fall off. Make sure it is fastened, otherwise it will be troublesome if it falls off while running.
This is particularly important, especially for car models or robots that have two wheels, left and right. The length of the tie rod directly determines the direction of the wheel. If the left tie rod is a little longer than the right, then your wheels are crooked when the steering gear is in the middle position, and it would be strange if they don't go astray when running.
Therefore, after you determine the approximate length based on the first step, it is best to use a caliper or ruler to accurately measure the length of the left and right tie rods to ensure that they are exactly the same. It's like a person's two legs, they need to be the same length to walk stably. The same length is the basis for ensuring that the vehicle can drive in a straight line, but don't rely on feeling.
After installing the tie rod, you may find that when you turn the wheel with your hands, there is a little loose space. This is the empty position. If the virtual position is too large, the car will float when running and the direction will be inaccurate. The virtual position mainly comes from the ball joint.
First check whether the ball head is not fastened tightly, causing any slack. If so, try changing to a tighter ball stud. In addition, the two ends of the tie rod usually have positive and negative threads. You can fine-tune the length and eliminate part of the gap by rotating the connecting rod in the middle. However, it should be noted that the principle of adjustment is to be smooth and without obvious frame. Too tight will also affect the flexibility of steering.
After installing the mechanical parts, don't rush to the ground and run around. We have to take out the remote control and set the EPA (end of stroke) of the servo. Put the car in the air, turn it in all directions, and observe whether the tires are stuck in other places, such as the frame or shock absorbers, when they are turned to the extreme position.
If the tire gets stuck before reaching the limit, and the servo continues to push outwards, the servo will easily overheat or even burn out. At this time, you need to reduce the servo stroke in this direction on the remote control. On the other hand, if the direction is full and the tire is still far away from the limit position, you can increase the stroke appropriately, or consider moving the tie rod one space outside the ball head hole to obtain a larger steering angle.
This is a pain that many DIY enthusiasts have experienced. The threads of aluminum alloy parts and plastic parts can be screwed up if you don't pay attention. The screws involved in installing tie rods are usually not large, so be careful. First of all, the screwdriver head must be of the right model, not one size larger or one size smaller, otherwise it will be easy to damage the screw slot.
When tightening, first turn it slightly counterclockwise a few times to find the "click" feeling, and then start tightening it clockwise. If you feel that the resistance suddenly increases, stop tightening it, especially when tightening screws into plastic parts. Just tighten the screws until they are firm enough. Don't burst the threads in pursuit of "absolute tightness."️Tips: You can apply a little grease on the thread of the screw to make it smoother and less likely to slip.
Well, regarding the installation of the steering gear steering rod, these practical experiences are shared here. I wonder if you have encountered any weird problems during the installation process, or have you got any unique installation tips? Welcome to share it in the comment area, let’s communicate and make progress together. If you find the article useful, don’t forget to like and share it so that more friends can see it!
Update Time：2026-03-07
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