Chuck jaw truing tool

[C-Bag]

Having never worked as a machinist but as a mechanic there are still some common concepts/lingo to machining that I'm going to have to bone up on. Like register. I think I get the concept. Like what taper is to X axis, but in the Y axis?

But in the shops I worked in the machines that were used by everybody were always suspect. Alignment racks were a good example where you give up a precision machine to the horde and always with a bad outcome. Especially with the electronic racks. All it took was for one of those wheel sensors to not be mounted right and it hit the floor and you were no longer doing a real alignment. Same thing with the valve grinding equipment, line boring, even brake lathe. So I can't even imagine sharing a lathe or mill.

Both my Chinese hobby lathe and mill/drill were owned by several people who thought they were improving them. So all this kind of info of checking and possibly correcting problems is invaluable to me. As I learn more and do more precision work it points up sometimes the limitation of the machine but more often than not shows a botched "improvement". And probably why I was able to pick it up so cheap

My problem is you can't probably drop it down to a low enough gear for me to get all the nuances. Like, your test bar. Obviously you have to buy one, but is that what it's called? Sorry for all the stupid noob questions.