I'd heard that a sine bar is an "exam" for an apprentice toolmaker.
All in all, it took about 3 hours to make (things wen't way too smoothly).
Here it is all done. Almost...
As you can see I didn't go crazy with the grinding on the bottom. Just enough to be flat. The wheel really needed dressing, and I traversed and fed quickly. For the top, I used a carefully dressed wheel, plenty of Crisco for lube and followed it up with about 2 minutes of lapping on 400 grit.