Rotating Ballnut - design ideas

[SafeAirOne]

Will you be oiling those taper rollers? I occasionally run oil down in to my spindle bearings and make a terrible mess. That's a thought maybe it is his choice of lube that is creating the heat.

As these bearings have no seals, I'd likely use grease. Which type of grease is yet-to-be-determined. The Timken catalog devotes 8 entire pages to lubrication of tapered roller bearings with a myriad of grease recommendations based on usage and environmental conditions.

Plus, I can just add a grease fitting to the hollow area between the bearings in the aluminum housing and grease them both simultaneously during machine maintenance.

The lubricant seems to be the driving factor in how hot these bearings can get; The point at which the various lubricants break down sets the max operating temperature for the bearing.