As an outsider, so far only Trickg has shown any evidence to what powder looks like after a vibration session. All the other companies have taken the lawyer's way out. (and no just because you have a "Dr." in front of you name means you are the be-all-end-all subject matter expert)
There is a significant different between high g/RMS and low g/RMS and duration times. It's been stated by coopermania that companies tumble after the process to do a final "clean-up". I would guess that is a low g/RMS for a short duration.
A question I would ask a company, is how does your ammunition not break down after a 3 hour flight on a helo? The rotor chop on a Huey and 53E puts out high g/RMS for a sustained period of time. We have weapons on board firing ammo that (per all of the guidance shown above) should not be functional, i.e. powder has broken down. So does that mean that the military gets a different powder with different characteristics? Or do they get a little notice in their ammo can that says "Sorry, you cannot vibrate this ammo as the powder will break down and possibly won't work"?
As an engineer, I say myth busted
*edit* If you are interested in the vibration profile the ammo on a military aircraft must survive, see MIL-STD-810E/F/G (revision depends on aircraft and when the requirements went on contract)
http://assistdocs.com/search/search_basic.cfm (type 810 in the Document Number)
As an outsider, so far only Trickg has shown any evidence to what powder looks like after a vibration session. All the other companies have taken the lawyer's way out. (and no just because you have a "Dr." in front of you name means you are the be-all-end-all subject matter expert)
There is a significant different between high g/RMS and low g/RMS and duration times. It's been stated by coopermania that companies tumble after the process to do a final "clean-up". I would guess that is a low g/RMS for a short duration.
A question I would ask a company, is how does your ammunition not break down after a 3 hour flight on a helo? The rotor chop on a Huey and 53E puts out high g/RMS for a sustained period of time. We have weapons on board firing ammo that (per all of the guidance shown above) should not be functional, i.e. powder has broken down. So does that mean that the military gets a different powder with different characteristics? Or do they get a little notice in their ammo can that says "Sorry, you cannot vibrate this ammo as the powder will break down and possibly won't work"?
As an engineer, I say myth busted
*edit* If you are interested in the vibration profile the ammo on a military aircraft must survive, see MIL-STD-810E/F/G (revision depends on aircraft and when the requirements went on contract)
http://assistdocs.com/search/search_basic.cfm (type 810 in the Document Number)
Most Ammunition company's use a Short High Speed 2 minute cleaning at the end.
I believe if you took a slick or a stallion and did barrel rolls and end over ends that it would be the same as spending time in a tumbler / vibrator. . Maybe some of you guys need to look inside a running tumbler and see what actually happens. Have any of you ever noticed that mil spec ammo has a full case or a compressed charge of powder ?
Hummmmm, its tough to have wear on powder kernels if you can't move around.
I would say to a engineer that believed that this myth is busted.. His College cheated him and his daddy should go and get his money back.