I work in an EB shop doing everything from welding, engineering assistance, machine repairs, and complete machine rebuilds. It's quite an impressive process and Ive had parts in my hands that come from some of the biggest names you can think of in aerospace, semiconductor, military, medical and more.
Are they for prototypes? Or how do you service production runs for parts?
If for arguments sake it were a part for an AWACS or an aircraft carrier you might only need to make eight or a dozen. But even military aircraft tend to run into the hundreds.
We do production runs with the rare service run. Most parts are one time use as you might imagine. Service work is the rare mold repair.
We are part of a few companies just in time manufacturing so they pay for expedite processing on orders as small a one piece to a few dozen. And we can get production run orders in the tens of thousands.