@Odie , I’m a bit curious about something. Seems like all the lathes on the market use plain roller bearings except for Vicmark and Oneway. Oneway uses angular contact bearings and Vicmark uses tapered rollers. Properly adjusted tapered roller bearings should be the stiffest bearing all else being equal. They are also much better at handling pressure from tail stock.
Do you notice this increase in stiffness while turning? Less chatter maybe? Seems smoother? Maybe the bearing type makes no difference at all. Just curious
Mike, if I may jump in (my Vicmarc lineage shown right above your message)-
An increase in stiffness while turning, I've never thought of, nor noticed that, neither while the machine is under power nor power shut off, so I'll say no. Maybe another way of asking- do the tapered bearings offer more resistance to movement by nature of the rod-style bearing and all the race contact it makes vs. a ball bearing? Well, maybe, but that would be the nature of that large bearing diameter they spec and the amount of bearing component contact surface in that style of bearing. Is the spindle hard to turn by hand? No, even without the belt under tension, it is nice and smooth and easy to turn, but you get the feeling that you are moving heavy duty components, relatively speaking. And the spindle assembly makes adjustments possible (tighten to near binding, then back off), although adjusting the bearing race compression is nothing I've ever had to do. Vicmarc has videos available showing how to overhaul their headstocks, old car gearheads will enjoy watching. It is about the same as the old style servicable double tapered bearing assemblies on the non-drive stub axles of automobiles, pre-modular bearing assembly era (back when mechanics re-packed the grease in those bearings by hand).
I've never noticed chatter originating from the headstock of any lathe I've owned (Sears Craftsman mid-1990s, Jet mini late-90s, 3 Vicmarcs since 2001, and now a Oneway), well, the Craftsman maybe... piece o' crap lathe.
Yes, all 3 of my Vicmarcs had/have headstock bearings that are buttery smooth. Well, maybe that butter is "room temperature, not melted" for stiffness with the full size VL200/300 (exact same spindle assemblies), but still buttery smooth, and freely rotating. None of this means anything to the 1.5hp DC motors I've driven the lathes with. In short, the stoutness of the bearings is not a detriment to the rotation of the spindle nor the motor driving it.
Great questions!