annealing in an oven?
Posted 16 January 2008 - 08:04 AM
First off, does annealing do that much to lengthen the life of brass? And has anyone tried the oven method?
Also if you anneal your brass, can you tumble them back to being shiny or are they forever discolored?
I have only heard of it done one piece at a time with a propane torch.
Posted 16 January 2008 - 08:21 AM
Posted 16 January 2008 - 09:25 AM
Posted 16 January 2008 - 11:51 AM
You don't need a special tip for annealing with a torch, it just helps some. You should NOT be annealing brass in the oven, as it will soften the entire case (as mentioned already) and could lead to a ruputered case head (read: bad juju!).
NG does burn lower than LP, but not by that much (a couple hundered degrees) to make a difference when annealing. It's all about the temp of the metal, not the flame itself...
Posted 16 January 2008 - 01:15 PM
Welders would anneal the metal and they would know they reached the correct temperature when it was "cherry red". Ok, what is cherry red? Is it the same working in the pit with the sun shining on it? How bout in the shop? Is the shop well lit or is there a dark corner where it is done? See where I'm going here?
PMI described it well, its not the heat of the flame, its the ability to maintain the optimal temperature, and a uniform zone around the section of the case that needs it.
Posted 16 January 2008 - 01:32 PM
There is a coating you can purchase that will inidicate the correct temperature by color change. The "shade tree" method is (in a dark room) when it reaches a dull cherry red (would that be turnip or red potato red? ) you should quench it. Another method is to stand the cases in water about half way up (as a heat sink) and anneal that way.
In theory, you shouldn't go hotter as the zinc (as I understand it) get's burnt off resulting in ruined brass (if the zinc is gone, I'd assume it'd be some impure form of copper, right?).
Varmint Al has a pretty good webpage describing it. You should be able to google it...worth reading and (to some extent) trying...
Edited by MarinePMI, 16 January 2008 - 01:35 PM.
Posted 16 January 2008 - 03:53 PM
I have learned the neck and shoulder but not the rest of the case needs be heated but not to the extent that the zinc is removed from the case, something about cherry or red potato red, special tips, no oven, and something about a shadetree LOL
I don't think annealing is a step that I will mess with until the kids are raised and I am hopefully retired.
Posted 16 January 2008 - 06:05 PM
Todd Kindler told me that pretty much ALL brass made today is too hard and should be annealed. I don't do it but he's probably right.
Posted 16 January 2008 - 10:04 PM
Posted 18 January 2008 - 11:00 AM
Posted 18 January 2008 - 01:25 PM
Annealing in the oven would be kin to playing Russian Roulette with all six cylinders loaded...
JMO - BCB