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Jap. Type 90 trench art undo

K

kahu1

Well-Known Member
Premium Member
This was flared at the mouth, now a bit more straightened and the lacquer finish removed.
Type 90 57 x 121mm case.
As i have found with a lot of Japanese cases the primer was easy to undo,seems they followed the British regs. on applying 'Petmans' to the threads.

casejp.jpgjpcase.jpg

cheers
Bob
 
If I may ask, what method did you use to reshape the mouth? Looks to be a fine job youv'e done.
 
Lots of peening and tapping ,using the tapered body of an 81mm practice mortar as a mandrel. Not too bad but a bit rippled up close!.
 
Hi Bob,

Did you apply a little heat? (OK a lot then?)

I have found in the past that cold working the rims normally ends up with cracks, but heating the rim till it glows a dull red (annealing) followed by working the rim results in a near perfect finish. I have used the same process to re-fit projectiles back into unfired cases (simply invert the projectile with the pointy end first).
(Of course you'll require a good butane hand torch and plenty of space!)

Cheers
Drew
 
Drew ,

No ,just cold beating.Might try the heating trick on the next one.

cheers
Bob
 
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