variable speed

So I have a WEN 3421 lathe with the variable speed drive. Does anybody know if I could use a variable voltage power supply to get lower speeds? My thought is that for doing some fills with epoxy, you need to keep it rotating slowly so that the epoxy doesn't sag while it cures. The slowest speed...

I've been looking for information to choose my first lathe. I've noticed that variable speed is a preferred feature. I'm wondering how changing speed applies to pen turning. Why would the speed of the lathe need to be changed? The variable speed lathes have speed ranges so changing a belt is...