Like many, looking for a new mid-size lathe. Rather than discussing brands/models I would like to hear comparisons between power supplies, 220v 1hp Servo and 110v 1.75hp AC in particular. Lathe size being 14” to16” throw and 24” between centers.
Doug, the 18/47 G0698 I owned for 5 years & then sold it to our club had a 2 hp D/C motor with controller. The newer 18/47 Grizzly G0733 that replaced that model, has a 2 hp A/C motor/ inverter. I have currently in my shop a G0766 22/42 with 3 hp A/C motor with Delta “M Series” inverter, and a G0800 24/48 with 3 hp A/C motor with the “EL Series” inverter. My Delta midi 46-460 has a D/C motor with controller.Thanks Roger. The info I find says the opposite, dc servo has more torque at slow speeds. The info I find on the G0698 says its an AC inverter drive not DC. Your direct hands on experience with many different lathes certainly helps. The fact that the top line lathes all use AC inverter drive says quite a bit about the subject. I would like to find info on a direct comparison (same HP/amp) of the Nova switched reluctance vs AC inverter at low speeds, below 500 rpm spindle speed. I suspect they are similar due to the gearing used with the ac inverter drive allowing higher motor rpm. The Nova motor can hunt a bit at slower speeds as the load increases. Over ~300 rpm things clear up and it isn't noticeable.