Hi NC Cams,
I readily admit that I am not a bearing expert but I know that Universal Thread Grinding Company, makers of a very high-end preloaded leadscrew product, offer their assemblies with just such a preloaded double row assembly.
Moreover, I called VXB several months ago with this same question and was assured that their double row angulars were preloaded. To my understanding, no play detectable to the fingers indicates at least a light preload, but I remain open to learning.
Rick L. |