Here are more images. The top is threaded for the adapter and the push plate is trapped inside as desribed above.
I wieghed it against a comparable projectile. The only thing keeping accuracy from being closer was the band on one,
if I had a loose band to add to the one without a truer weight difference would have been perhaps found.
As it is they both weighed in at 8 pounds 5 ounces each ~ So I learned nothing ~ :tinysmile_hmm_t:
At what point was the adapter machined to it's final shape, was it in place on the projectile for this operation as it seems
to appear here ?
The unfinished adapter weighed in at 11 1/2 Oz. A finished one at 9 1/2 Oz. So the reject is 2 ounces over standard weight on the adapter side of things. If someone has a weight for the band itself then we can do some subtractions from both projectiles and get
a decent weight comparison. At this point 2 ounces come off the reject to equal the finished projectile, if we can deduct the weight of the band from the finished one then we have it ~
I have added two pages, one giving a finished weight which is much lower than the weights I'm getting. I checked my scale with a 12Pr practice shot which came in at 12 1/2 pounds and a 3Pr practice which came in at 3 1/4 pounds. So I'm not sure how to read a finished shell - is this the empty forged body ?
Aside from nearly cutting the top off of the projectile , the accident brought the body under the minimium diameter limit at the point of damage. Minimum Dia. is 3.28" cut = just under 3 1/4" = 3.24". This of course can not be reversed so rejection was the only action to take. Ironically the inspecter or machinist enitials on the base are "IQ". D'oH :banghead:
I steel wooled all the loose surface rust off of it and it looks cleaner and a little more like the day it was born, I'll just give it a coat of wax and it should be good for years now.
Some one posted a visual description showing the steps of 18pr manufacture, in particular the prior insertion of the push plate, this was quite a while ago.
If you have this can you repost it, I have it but can't find it of course. Maybe explains when the adapter was machined to shape as well ?