Unscrewing shells

[SG500]

Over the years I've seen many relic/rusty shells that have been unscrewed, the following post being a good example.

http://www.bocn.co.uk/vbforum/threads/92205-ID-unknown-75mm-shell

My query is how do they get unscrewed? I'd assume heat would be potential suicide so are they put in something very cold to shrink the metal?

Dave.

 

[HAZORD]

In the post you listed as an example, you can see the pipe wrench marks on the nose fuze. I use a chain pipe vice after I have wrapped the projectile in 2 or three layers of rubber from an inner tube. You can also get large chain pipe wrenches. Strap wrenches also work, if you can get good friction on the steel. The inner tube gives good friction, and protects from any sharp teeth on a pipe wrench or vice.

I also use good penetrating oil first.

 

[Yodamaster]

A bath of penetrating oil during a week (or two) !


Yoda

 

[SG500]

Thanks guys useful advice.

Dave.