Run out?

[nilebartram]

What is "run out"? nilebartram

 

[MikeMcCasland]

What is "run out"? nilebartram

Another term for concentricity. The more 'run out' it has, the less concentric it is.

 

[Dud]

A rifle spins a bullet so you get a lot of the same terminology you see in lathe work.

Most work done in a lathe is meant to be concentric but you don't really measure centers in a lathe, you measure a ~cylindrical surface while moving the lathe spindle and you'll get measurements like TIR which is total indicated runout. The thing is it doesn't tell you if you have a cylindrical surface that's not concentric to the spindle, a cylinder with a low spot or a cylinder with a high spot.

In practice it is pretty synonymous with concentricity as Mike said above.

The actual technical definition doesn't really matter unless you are tolerancing parts on a mechanical drawing or doing QC inspections on physical parts.

 

[ebb]

When ammo is loaded and the bullet and/or neck of the case are not in a straight line with the centerline of the cartridge.

 

[Concha]

 

[JMayo]

The point wiggles when you spin the case.

 

[bobm]

This short video clearly shows a severe run out condition.

 

[mikecr]

I see runout as physical deviation from a standard (a round shape in this case).
When a cartridge is truly round, full length of it's plane, it can be described as straight.
I cannot expect better chamber centering than from straight ammo.

 

[agr516]

Think about a poorly thrown football. The wobble is runout.