For those that like to tinker.

The friendliest place on the web for anyone who enjoys boating.
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That guy is a toolmaker. I'd like to see one of those so-called "machinists" programmers of today turn out something like that on a tool-room lathe. As the millwright supervisor with the most time in grade, I was tasked with interviewing potential milwright hires for the city and county of Los Angeles. First thing I did was bring the candidate to a lathe and ask him to set up for a single-point 3/4-10. Right off the bat you could tell whether they knew what they were doing.
 
Ancora is absolutely correct! As a young apprentice tool maker I was told that the lathe is the only machine (at that time) that is* capable of reproducing itself.

That video just blows me away!
 
I didn't see a piston ring put on at any time.* But the piston looks like it had a grove in it for one.

I have no idea if the guy is a tool maker or just*a hobbiest.
 
Here is more awesome stuff from NAMES (North American Model Engeneering Society)

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The engine in the original post just spins on compressed air. It's not a working V12, but there are engines that NAMES people make that DO run! I wish I had taken machine shop in high school after seeing this. :-D
 
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