quick question I could of course just experiment to figure this out, but I am in the process of making a small self centering vice, for my 4" rotory table, I am still milling in this project havn't gotten to my lathe work yet, so I'll ask a quick question I know you all could give me the answer to, to turn a LEFT hand thread on my lathe, do I need reverse spindle rotation ,carriage feed, or what is the combination, thanks in advance

Dave...