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Machining a shaft(?).
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Previously:
https://www.homemadetools.net/forum/...158#post218147
https://www.homemadetools.net/forum/...991#post191206
https://www.homemadetools.net/forum/...0885#post73315
https://www.homemadetools.net/forum/...675#post216272
Looks like they were making profile router cutter for making crown molding, but noticed one of the profiles was not the size they needed, before it was sent out for hardening.
An interrupted cut is bad enough but trying to cut the full width of the profile is murder on a lathe.
What kind of a machine is that? I thought I was fairly at home in a machine shop but I don't know what the hell that thing is.
At first, I thought the cutter movement was from making the interrupted cut but after looking again, I see that the cutter is scraping off a back relief to the teeth on the part being made. A real heavy-duty lathe with a timed cam-controlled tool post or the cross slide itself could be made to do this. Or a Shaper set to minimal stroke no clapper on the cutter timed to a rotating axis. Maybe TM51 will chime in he knows quite a bit about specialty tooling machines.