Vintage screw cutting machine machining a cam - GIF

Vintage screw cutting machine machining a cam.

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Previously:

https://www.homemadetools.net/forum/...733#post193938
https://www.homemadetools.net/forum/...841#post186777
https://www.homemadetools.net/forum/...735#post155884
https://www.homemadetools.net/forum/...836#post179135
https://www.homemadetools.net/forum/...031#post157113

I have never machined a cam and always wondered how they kept from hanging up or gouging the back side of the lobe as it turned. That retracting cutter action is very interesting.