Re: Optimum BF46 Vario spindle getting hot and tool holder sticking
All the RF clones have tapered roller bearings and they make a lot of heat if the preload is high. The spindle will also need to be broken in by running it in both directions at med speed and then high speed while watching the temps.
It takes at least 10 hours of running to be mostly broken in but really it takes longer.
If after a few hours of running its still that hot and if you have good grease in the housing then you will want to re set the bearing preload.
The preload is set by a spanner nut at the top of the spindle and the top bearing vary well may be a press fit on the shaft do you will have to tap the shaft to loosen the bearing pressure. If it fits that tight which most do then the bearing will stick slip the fit which makes setting preload much harder.
I would loosen the nut by the smallest amount and smack the shaft with a heavy hammer protecting the shaft with something soft. Getting it right is fairly fussy.
Too loose will chip tools and let the bearing chatter.
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