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A PHP program by Evan Lewis:
Link to this program:
Evan's YouTube Channel: YouTube Playlists-mainly lathes
Evan's YouTube: Understanding Geartrains
Heron's steam engine:


Boxford Users Group
Blondihack's Engineering: Quinn Dunki's supurb engineering channel
Winky's Workshop: Engineering YouTube channel
Keith Appleton: Model Engineering
Enots Engineering: Alan's' engineering methods
Alan talks about this program
Joe Pieczynski: Engineering demonstrations by a professional
Tony Griffith's Detailed information
about every lathe you could imagine.