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These lathes?

https://www.crozierspeedlathes.com/

https://www.youtube.com/watch?v=NzaOsPcaoi4

It looks to me like they're for hand-finishing (deburring or polishing?) parts. I wonder in what kinds of work that comes up often enough to justify dedicated machines?

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Aerospace, semiconductor, etc., basically anywhere you have precision round parts. You can debur alot by hand but not so much external diameters which are often done on these machines for low volume / prototyping / reworking / etc.

Ha you found them, yeah that's his company.

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