- Joined
- Apr 8, 2013
- Messages
- 2,006
On my Grizzly G4003G the intermediate gear is a double with 86 and 91 teeth. They use that to convert to metric threading. Although my lathe will do all imperial threading from 4 to 112 tpi with the Norton gearbox, to cover all the metric threads requires three gear changes. These gear changes for metric combined with my laziness have made me a big fan of imperial threads.