Here's a small idea that might be of help to some of you.
I've been working on a project that required many short screws of a length not available that go into blind holes so after getting tired of hack sawing screws in the vise, I thought of this little jig.
It's just a small plate of aluminum that I drilled and tapped for (5) 8-32 screws, (the size my project called for but you could make this for any size screw or bolt).
Turn the screws in from the bottom side nice and snug, then install in the mill and run an end mill down the line to trim them off! They all come out the same height and when done, it's easy to take a small file to clean any burrs off of them while they are still in the plate.
I am going to make a few more of these for various size screws. It seems I'm always having to trim screws for something or other so now I can use this method when there are many to do. (I also number punched the size on the face to quickly identify it)