Gears for cutting metric threads on inferial lathe

[mklotz]

How about cutting English threads on a lathe intended for Metric? My old SouthBend 9" is set up for Metric.

Why would anyone lucky enough to have a metric lathe want to convert it to cut inferial threads? Sorry, just kidding.

If it has an inferial leadscrew, there's a good chance that it already has the 1.27 ratio gears in place. Removing them would then bring it back to inferial operation. Most likely it would be the 47:37 pair. Check the gears between the spindle and the leadscrew.

I'm not a lathe historian so I don't know if Southbend, a USA company, ever made fully metric, i.e. with metric leadscrew, lathes. Lots of funny stuff went on during the war so I suppose it's possible but I've never encountered one.

[JoeH]

Thanks Marv,
I'll check that out. I still live in the 3/8-16 world. But the lathe was a deal that came with a bunch of tooling and I couldn't pass it up. I've done lots of simple turning on it but haven't tackled learning to make threads partly because I don't normally need metric stuff.
Joe

[DIYSwede]

Why would anyone lucky enough to have a metric lathe want to convert it to cut inferial threads? Sorry, just kidding.

@ JoeH: -Perhaps my method for precisely this can be of help, though perhaps a bit lathe...
http://www.homemadetools.net/forum/i...ic-lathe-73187

@ Marv: -Merely for repairing stuff or toolmaking for that - for prototyping or new gear I need Imperial tooling as much as a hole in the head.