On Thu, 10 Feb 2011 18:01:49 -0600, Karl Townsend
wrote:

I'm preparing to machine several AL 7075 T6 forgings...

"The Kid" (my son) tells me I should anneal before machining because
there will be hard brittle spots. Easy enough to do at the anneal temp
of 775 (not sure how long). But, then I haven't got T6 grade 7075 AL
anymore. How would I get it back to T6 grade?

Or, am I better off with plan "A"? Don't anneal.

Karl

We once had a job machining some annealed aluminum, I don't remember
the alloy, and it was terrible gummy and hard to get a finish on so
the boss sent the whole lot out for heat treating, we machined it and
sent it back out for annealing.