Not to create a Flap here but I must strongly disagree.
The 3 Phase system will give a better finish.
The VFD offers speed control and programmed soft starts and stops, reducing the tendency for chucks to either stick or spin off in reverse.
With the advent of 120V input 220V output VFD’s that actually cost less than switching to single phase motors, IMHO there is no choice but to stay 3 PH and get a VF
Having said that you do need to change how the drum switch works.
Ah, more information…
- you'd be much better off swapping the 3-phase motor for a 110V single-phase. Southbend sold lots of lathes configured that way, so it's not a huge violation of the original spirit of the machine (and believe me, I do understand the "I like original" mindset - I'm currently building a 480V 3-phase system to parallel my existing 220V 3ph system, entirely because I don't want to rewire a recent acquisition into a configuration that was never a catalog-configuration from the manufacturer. This is doubly ridiculous on my part, as reconfiguring the machine would actually be straightforward - the motor is dual-voltage. Anyway - let's say I understand obsessive-compulsive on these things…)
Will
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