Pneumatic chuck - GIF

Pneumatic chuck. Not really sure what to call this device. Looks like a Longworth chuck though.

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Previously:

https://www.homemadetools.net/forum/...141#post176452
https://www.homemadetools.net/forum/...331#post192440
https://www.homemadetools.net/forum/...103#post191533
https://www.homemadetools.net/forum/...827#post190676
https://www.homemadetools.net/forum/...715#post193858

So what is the Pneumatic chuck chucking? Interesting/fun project but not useful.

Ralph