Why does the Pogo pin not bounce back in place?

The problem of Pogo pin (spring pin) not bouncing back in place can be caused by a variety of factors. Here is a detailed analysis of the reasons:

Excessive compression or lateral load

1. Over-compression:

• Cause: When the Pogo pin is subjected to too much axial pressure, its internal spring may exceed its elastic limit, resulting in permanent deformation of the spring, so that it cannot spring back in place.

• Example: When using Pogo pins, customers may press them by hand to form a fixed spring after applying extreme force to the pin shaft. After the spring is fixed, the needle shaft will not return to its original position.

• Solution: It is recommended to protect the pin shaft as much as possible from any excessive compression before using the Pogo pin. Customers can prevent excessive compression by creating mechanical stops or limiting the compression capacity of the application.

2. Lateral load:

Cause: Lateral loading can cause the pin axis of the Pogo pin to deviate from its normal axis, which in turn causes the internal spring to be twisted or shear. This non-axial force can cause the spring to deform or damage, preventing the needle shaft from bouncing back into place.

• Example: During assembly or use, if the Pogo pin is subjected to improper lateral forces, such as a collision or squeeze, it may not bounce back.

Solution: Ensure that the Pogo pin withstands only axial forces and avoids lateral loads during assembly and use.

Second, structural design problems

1. Coordination of needle and needle:

• Reason: If the design of the Pogo pin's needle and needle is unreasonable, such as the gap is too large or too small, the needle shaft may not be able to move smoothly or rebound.

• Solution: Optimize the structural design of the needle and needle to ensure that the fit between them is neither tight nor loose to ensure that the needle shaft can move smoothly and rebound.

2. Spring design problems:

• Reason: the design parameters of the spring (such as spring constant, number of turns, diameter, etc.) are unreasonable, which may lead to insufficient or excessive elasticity of the spring, and then affect the resilience of the needle shaft.

• Solution: According to the specific application requirements, select the appropriate spring design parameters to ensure that the spring can provide enough elasticity to support the needle shaft rebound.

3. Problems in the manufacturing process

1. Material quality problem:

• Reason: If the Pogo pin pin shaft, needle or spring is used with poor quality materials, such as uneven material, defects or insufficient hardness, it may cause the needle shaft to fail to bounce back in place.

• Solution: Select high quality materials and carry out strict quality control on raw materials to ensure that material properties meet the requirements.

2. Machining accuracy problem:

• Reason: In the manufacturing process of Pogo pin, if the processing accuracy is insufficient, such as the inner wall of the needle is not smooth, the diameter deviation of the needle shaft is too large, etc., it may cause the movement of the needle shaft to be blocked or unable to rebound.

• Solution: Improve the machining accuracy, ensure that the inner wall of the needle is smooth, and the diameter of the needle shaft meets the design requirements.

3. Welding or other process problems:

• Reasons: In the process of welding or other process, if not handled properly, such as soft wire or PCB welding flux (https://baike.baidu.com/item/%E5%8A%A9%E7%84%8A%E5%89%82/9947430) too much allowance, by spreading in tube heated to high temperature, Cooling causes the needle and needle to stick.

• Example: The flux remains inside the Pogo pin, forming a solid glue or colloidal residue after cooling to block the nozzle, resulting in the needle shaft can not press or rebound normally.

Solutions: Optimize welding and other processes to ensure that no residues affect the proper operation of the Pogo pin. Use appropriate cleaning agent to clean up the flux residue after welding, but pay attention to the selection and use of cleaning agent to avoid secondary pollution to Pogo pin.

4. Problems in the use process

1. Dust and stains:

• Reason: The Pogo pin may accumulate dust and stains during use, which will hinder the smooth movement of the needle shaft, resulting in failure to bounce back in place.

• Solution: Clean Pogo pin regularly to ensure that its surface is clean and pollution-free. Clean with appropriate cleaners and methods to avoid damaging the surface coating or other components of the Pogo pin.

2. Wear and fatigue:

• Reason: With the increase of use time, the Pogo pin shaft, needle or spring may lose its original performance due to wear and fatigue, resulting in the pin shaft can not bounce back in place.

• Solution: Check the working status of the Pogo pin regularly, and replace or repair it in time if signs of wear or fatigue are found.

In summary, the problem of Pogo pin not bouncing back in place may be caused by a variety of factors. In practical applications, it is necessary to investigate and solve according to the specific situation. By optimizing design, improving manufacturing accuracy, strengthening quality control and maintenance, the problem of Pogo pin not bouncing back in place can be effectively reduced.