I just installed my replacement KL-300 spindle after the front bearings on the original burned out.
To try and make sure I do everything I can to not have a repeat, I'm trying to break in the bearings (can't really hurt.) I've been increasing the speed in 10% increments (6000 RPM at a time,) with at least 10 minutes per step at the lower speeds (up to 24k I think,) and 20 minutes on 30 and 36k.
Thing is, at 36k, the front of the spindle is getting quite a bit hotter than the rest of the spindle. My VFD is also reading around 50 watts with absolutely no load on the spindle.
Is this normal?