My 2015 vintage SBL-15 lathe has a bit of rumbling or vibration noise noise at 1500 rpm or above when using the manual 5C collet closer. I haven't checked for noise with a 3J or 4J chuck so don't know if that would make a difference.

Is there a Tormach-approved procedure for adjusting the bearings? I'm wondering if the assembly has loosened up a bit over the past few years. I emailed support about this yesterday but haven't heard back from them yet.