I received a 12mm rod. If I were going to put 30 pounds on either end of this shaft I would worry about flex. And my, is it light. The bearings are really skateboards, adequate for proof of concept. The shafts are never going to go faster than 1 rev/day except for short movements.
I ordered some 1/2" OD, 3/8" ID acetal tube to turn to act as a corrosion barrier between shaft and bearing inner ring. This was not hideously expensive but with three feet of it, I can make many mistakes cutting segments to just fit inside the bearings.
I am not sure of the concentricity of the shaft (which is really sold as a rod, not a shaft). I may turn it down a few tenths of millimeter to make sure it is concentric. I will turn the corrosion barrier after I have that complete.
The bearings are 1 1/8" OD. I could not find bearings smaller OD with .5" ID, but I should be able to find 1 1/4" ID acetal tubing for the housing, then turn an acetal corrosion bearing to go between bearing and housing tube.
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