brass nibbing

[kokomokid]

Anyone here do brass nibbing on a lathe to make longer brass? What is the procedure?

[GRUMPA]

Nibbing??? That's 1 I never heard of before...I'll have to make sure I keep an eye on this thread.

[EDG]

This is the same process known in industry as metal spinning.
Most metal spinning is done on the outside forming a flat sheet over a mandrel.
The forming tool is much larger and it is usually tipped with a roller.

Working on the inside of a case would be kind of slow and might damage your brass unless you can get a bearing inside.
It might be easier to work on the outside of the case but your tooling would be in the chuck and you would have to spin toward the chuck. It is a very simple process that requires some skill in the manual art of hand to eye coordination.



https://www.youtube.com/watch?v=um-biLfru-c

[MrWolf]

Now that is pretty cool. Think he has been doing it awhile?

[Grendl]

Believe it or not, metal spinning was taught in my high school "shop" class when i took it, a long long time ago.
Rick

[Grendl]

And as side note: while stretching the brass to lengthen it, you are also thinning the walls, and if you are doing it manually, oo the wall thickness probably won't be consist ant along the length of the case.
Just points to consider.
Rick

[kokomokid]

I know Buffalo arms stretches brass to make a lot of old calibers but i dont think they use a lathe.

[texassako]

I know Buffalo arms stretches brass to make a lot of old calibers but i dont think they use a lathe.

They sell a stretcher and used to sell some of the brass you could stretch with these. I remember running across their pre stretched .45-70 before when browsing through their site, but I don't see it anymore. These only work on straight cases: http://www.buffaloarms.com/Search.aspx?TERM=stretcher . I have purchased several obsolete cases from them, and if the conversion book says it will be short then BACO's will be short as well. Never heard of them stretching anything other than the couple they sold listed as stretched.

[montana_charlie]

Another stretcher ...
http://kal.castpics.net/CaseStretcher.html