"Richard J Kinch" wrote in message
. ..
DeepDiver writes:

Finally, why are 40 National Taper spindles so rare in milling machines
sized for the small shop?

Historical standards tend by nature to self-propagate long after they are
obsolete. Especially with tooling.

Hmmm... I was under the impression that NMTB predated R8. Perhaps I'm wrong.

- Michael