"Jeffrey Lindemuth" wrote in message
...
I am going to use a tool post grinder on my 9 inch star lathe. I picked up
a
Dunmore #14 at an auction recently. It is small, but taking lite passes
and
grinding between centers, I think think it will be OK. This is a hobby
project, time is not a major concern.
For lapping, I am planning to use cast iron laps and lap on the lathe, as
described in modern toolmaking methods (1915).
Just seems like a neat project.

If you set your compound rest to 6º clockwise past the z-axis (that is,
almost parallel with the ways the carriage slides on), each graduation on
the compound turns into a movement of 1/10 of the grad in the x-axis.

This means that if you dial in .001" on the compound rest, you will reduce
the *diameter* of the work piece by .0002".

Yes, for all of you with calculators it's actually something like 5.75º but
you don't need to be that picky.

I've had to turn (with a HSS cutter) 12L14 to a tolerance of +/-.008mm and
this method works quite well.

HTH.

Regards,

Robin