Sorry, don’t know where you read it. In a book, on line?
One dimension (rounded corner) or hemispherical? Woodworking, but the same basic idea for rounding a corner ( might need a better clamping arrangement.
**LINK**
Oops, I think the addy is not the right one. I just searched for rounding with a belt sander or similar. Just need to add something to fotate the bar if it is a round one….
Edited By not done it yet on 28/01/2018 17:31:46