Making a trapezoidal bronze nut for the lathe

[Toolmaker51]

(Really, this a home made Part, for a tool, more than a home made tool, so if it does not count, please feel free to delete this post!)
Cheers,
Craig

Rest easy; very little here qualifies as a "isn't".

Nothing says 'Tool' is a single well defined item, or an assembly of them; just a portion functioning to accomplish it's part of a job. Example, auto body forming dies; gigantic steel blocks that received all kinds of machine operations/ hand work, completely useless until mounted in a suitably large press, itself a result of completely different processes.
It's figuratively impossible to find the origin of a current piece.
There is video on Starrett micrometers being made on very old fixtures; another, much the ammunition produced for our military is on well maintained equipment pre-dating WWII.