Feeds are not to be less than 17 revolutions per I" tool
travel, and finishing feeds are not to be less than 90 revolutions
per I" tool travel.
If the above is exceeded, a less speed than that given in
table from other post must be used.
For large diameters, use reduced speed, as the strain on
the tool is greater.
Cutting feeds. Lathes with belt feed are limited to
three changes; lathes with gear feed are not limited.
For heavy work, coarse feed is about 17 lathe revolutions
to 1" of tool travel.
For average work, medium feed is about 38 lathe revolutions
to V of tool travel.
For average work, fine feed is about 90 lathe revolutions
to 1" of tool travel.
For tool making, a feed of 200 revolutions is often used.
Attention. A beginner may use finer feeds until he acquires
some experience; about 80 to I" for roughing and 140 to I"
for finishing.
If all else fails guess!!!
I hope this helps some,
Paul