Hello guys .
i am intending to me make a homemade through-hole slip ring of an internal diameter of 8mm . all of the pre-made ones are too expensive since they seem to be using precious metals for some reason . i won't be driving any fancy signals through it , only a power supply and low frequency serial for an arduino . my thoughts are to buy some sort of conductive material in the shape of a thin Tube . cut the tube , place it on my rotating shaft and then get a stationary conductive rod to come into contact and have friction with it . now my problem is with the tube , i can't figure out where to find it . i can't figure out where to find something conductive and thin shaped like a cylindrical tube .
the length doesn't matter at all because i can cut it , all that matters is a the diameter which has to be strictly superior than 8mm and less than 15 . i kept searching for "copper cylinder" , "copper tube" , " conductive cylinder" and so on .. and i found nothing at all . do you guys know the name of something that can assist to make this ?
thank you very much .