Yeah. Was wondering why he posted on a lot of threads in the same manner
One thing he did mention caught my attention though: the changes for the V2 batch of big springs.
There are three which could be done to lower resistance further: reduce the number of coils in the spring, increase the wire thickness to 1,1mm, and change the coating from nickel to silver.
The first one could be done, would help with spring compression, but reduce yield strength and increase the chance of plastic deformation, meaning contact resistance would be upped by quite a bit and lead to heat spots. Although insignificant compared to the total resistance, it would get rid of some the benefits of this method since the total resistance wouldn’t go down as much.
Increase the wire thickness would be very helpful, increasing yield strength and conductivity, but stiffness would be increase, and the force to compress it down would also increase in the same manner.
Contact resistance would also go down, but the chance of coils making a lateral deformation would be increase. There shouldn’t be a cost increase, not a significant one if we only go with 1,1mm wire, if the manufacturer can order it of course.
The only easy swap would be a silver coating, granting lowered contact resistance because of lower hardness, but also because of the higher conductivity of silver vs nickel(106% IACS vs 22% IACS). It would make the springs more expensive though. By how much? I don’t really know. I haven’t asked them yet because, vacation on their part.
However, increasing the wire thickness and removing a coil could work theoretically, but you’d need a 1,2mm thick wire, and that would boost the price by a non-negligible margin.
That would pretty much make it the best spring though. Good mechanical properties, and even better conductivity.
TLDR: Text explaining high conductivity springs, or how to make them even better.