Mag is not that bad, especially newer alloys that are more stable and corrosion resistant (relatively).
I made a pair of Faraday Cups for a satellite from AZ31B ages ago, almost all the metal parts were nickel flashed, then gold plated. It was a bit of a pain, and yes, we had a fire, but not too big because we regularly cleared chips away from the machine.
What's the purpose of the part, do you have engineers who can spec the right mag alloy? If you don't mind dealing with someone a bit distant from NY I'd be happy to look at drawings.
Just as a warning to anyone that might underestimate the fire hazard.
Remember May 2,2018 when Ford 150 production was in jeporday from lack of dashboard production.
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This is-was the Eaton Rapids Meridian facility. Mainly a diecast and machining operation for a multitude of automotive parts. Mainly dash boards, engine cradles, and rear suspension cradles.
At the time of the fire, majority of the manufactured stock and raw magnesium ingots were stored inside, the building was fully sprinkled and CO2 suppression systems were limited.Finished parts were also stored on racks for transportation and handling for customer use.
The only method available and would work was to use ammonia sulphate which was normally used as a flux in the diecasting machines and bury the fire in it. Cleanup was a huge mess as the ammonia sulphate melts at a similar temperature as the magnesium.
I think that they chief problem was in lack of a contingency plan in the event of a fire and how to proceed in extinguishing it. It should also be realized that many fire departments are not fully aware of all of the risks in their fire protection district. Water is usually the first line of defense in putting out most common fires and so that is the perspective that everyone has when they show up at the fire and hook up the hoses.
I am not trying to scare anyone but if you are machining with combustible metals, the risks of a potential fire needs to be accounted for, the risks minimized, and an adequate fire and or disaster plan implemented and shared with your local fire protection district.
Magnesium does not need to be feared but respected.