I am not an engineer, but I believe that it has to do with preloading and heat. A motor may be exposed to a substantial amount of heat, but they have some free play to it, essentially allowing the shaft?to float a bit. The life may be shortened due to the combination of loading and friction from the preloading of the bearing to eliminate?all movement. Just a?thought I had while reading through this thread.
Maybe the axial loading when machining on a lathe?
Of course, all the drill presses I've been inside of have ball bearings and most of their load is axial in spite of that.? But maybe the axial forces involved in using a drill press aren't as large as those when using a lathe.
Or it could just be cheap bearings or even cheap lubricant.
On Wednesday, February 14th, 2024 at 9:42 PM, davesmith1800 <
davesmith1@...> wrote:
[Edited Message Follows]
I have used the 6206 bearing in motors and doors. The life for a seal 6206 ball bearing is 20,000 to 60,000 hours.
In a mini lathe a lot shorter.?
Why is it so short?
Dave
