On Aug 23, 8:03 am, MikeMandaville wrote:
Any metalworking operation which can be done by machine can also be
done by hand. Is this statement true oe false?

I say no. Manual accuracy depends on comparing the work to a reference
and removing high spots. You can make extremely straight and flat
reference surfaces by hand but not cylinders or screw threads.

Holtzapffel book 2 (?) is a good reference for the many attempts to
generate an accurate master screw thread by hand.

jw