I bought a few huge Acme Gridley RB-8 screw machines this week. They
are similar in every way to this listing:

https://www.machinetools.com/en/for-...screw-machines

They and their parts are all scrap material despite being in good
condition.

I know that they are impossible to sell. What I do not understand is
why?

They seem to be very useful and productive manufacturing machines
for high volume production, making things like industrual fittings,
etc.

And yet nobody buys them. WHat were they replaced with?