1. Is there a transmission between the prime mover and the universal joint coupling? If there is a transmission, what is the transmission ratio? How many output shafts are there after passing through the intermediate gearing? Is there a power shunt? We need to consider the type, power and speed of the prime mover. What is the rotation speed of the universal joint cardan shaft itself? Whether the cardan drive shaft needs to do dynamic balance test. When performing the action dynamic balancing test or balancing, which level of balance quality is required?
2. We also need to consider the types and selections of prime movers. Load categories of universal joint transmission shaft transmission loads: unidirectional constant load, pulsating load, or two-way alternating load. What is the installation status of the universal joint drive shaft? Is it horizontal, vertical or inclined? To make its axis bending angle less than 3 degrees, if forced to tilt installation, to determine the horizontal and vertical angle in advance.
3. We should consider the prime mover's work environment as well, whether there is high temperature, dust, water spray, chemical corrosion and other adverse environmental conditions. We should select the corresponding type of universal joint cardan shaft according to the use environment. Is there a limit to the installation location? What is the length of the installation? Whether the industrial cardan shaft need to scale? If expansion is required, what is the elongation outward of the universal joint coupling in the shortest state. For the universal joint coupling that does not require expansion, the compensation of axial size error must be considered and the position of compensation in the system must be determined.
4. We also need to know the connection form and specific installation size required at both ends of universal joint coupling, as well as whether there are special requirements such as installation bracket.