Afther further review, it seems the Invar 36 and 36 FM (Free Machining) is like 36% nickel? WTF? That's Free Machining?!?!?!
It also seems it's used primarily for it's coeffecient of thermal expansion, (clocks, diplexers etc)
I also see suggestions to aneal it for stability. I will end up with about 75% or more material removal (pocketing out the wazoo), is this going to be an issue if I don't get it anealed?
Here's a pict of what it's gonna look like. The quantities could be in the hundreds, so I need to nail the cycle times/tooling charges.
The pocketed area you see below is all toleranced at ±.002.