metric threads on heavy 10 south bend

[Westex]

Can you get a gear or gears to to cut metric threads on a heavy 10 south bend. I might want to cut some metric threads someday. Thanks! Mark

 

[Robert]

Can you get a gear or gears to to cut metric threads on a heavy 10 south bend. I might want to cut some metric threads someday. Thanks! Mark

Westex,
Using a 127 teeth gear as driven gear on the Norton gearbx shaft should allow to find a setting corresponding exactly to most of metric pitches.

R.G.C

 

[Westex]

Thanks! I will check that out. Mark

 

[skinnj1]

FWIW
with the change gear mentioned by Mr. Chombart, you will need to keep the half nuts engaged at all times and do the "make a pass/retact tool/reverse/advace tool/ start again" shuffle, not a big deal just something to remember...Such is the life with cutting metric threads on an english lathe (or cutting threads without a thread dial)

 

[Robert]

FWIW
With the change gear mentioned by Mr. Chombart, you will need to keep the half nuts engaged at all times and do the "make a pass/retact tool/reverse/advace tool/ start again" shuffle, not a big deal just something to remember...Such is the life with cutting metric threads on an english lathe (or cutting threads without a thread dial)

SkinnJ,

The 127 teeth gear is the simplest I can recommend. The diial indicator method need at least a dial indicator nit always availabel on old machines, need the non-skilled operator to learn how to work it and is subject to errors...

The forwad-reverse is the simlest.

R.G.C