trunnion question

[Seth Harness]

What exactly is a trunnion and what exactly is its purpose? Ive searched this site and Ive googled it. I saw pictures of a few that look like they become kind of a bulk-head (if you will) once inside the weapon, but for what?

I also find pics of mounted shop machinery also refering to a trunnion... Im confused.

If its possible pictures always help me understand

THANX.

[GKoenig]

http://en.wikipedia.org/wiki/Trunnion

[Seth Harness]

http://en.wikipedia.org/wiki/Trunnion

Cool, thanx. Trunnions are such a large part of alot of thing and I never really knew how to refer to those particular parts.

Kind of an epiphanous moment for me. I guess I feel a little like a jack-ass
Thanx again.