Bridgeport spindle bearings - do they like it when you snap end mills?

I have a question about the proper amount/type of noise spindle
bearings should make. I have a Brideport Series I CNC machine with
the rigid ram.

Before tonight if the speed was up around 3400 RPM you could "hear"
the bearings "whirring" around. Nothing scratchy or loud.

Tonight I snapped a 3/8" carbide end mill trying to rapid while an
inch deep in aluminum (accident). Now I would say the bearing noise
has changed. Still not what I would call loud, but certainly
different.

So what kind of noise is normal, and do you damage anything by
breaking off end mills like this?

Thanks.