For example, cutting some angle steel at 45 degrees to make a
table top.

Consider coping the angle iron instead, it's easier to get
a square joint. You can cut back the top so the whole other
side sits square against the remaining vertical portion, or
you can cut the top of the 2nd side piece so that the vertical
part of the piece slides under the top of the first
piece, and round the corner so that it fits in the fillet
radius. I didn't explain that very well, but I think there's
some pictures of this out on the web, maybe even in the
dropbox...

Now, before this goes any further, please do *NOT* tell me
to "go buy a chop saw" or "buy a used band saw" or whatever.

Go buy a thin cut-off disk and a 4-1/2" mini grinder. :^)
At least it's cheaper than a chop-saw, and it has 1001 other
uses... I can't count the number of times mine has saved my
backside.

--Glenn Lyford