I'd like to know who has made one of these and any tips you would care to share for making one. In the past I have made "special" angle blocks that capture an over all rectangular part at a particular angle. It has a clearance where the edge of the part is located assuring burrs, dings, and chamfers have little or no affect in the location of the edge in relationship to the angle block. This allows me to indicate/probe/touchoff the angle plate/block and use the math to tell me where that edge is. It works, but its cludgy, requires some math (or cad to do the math) when often what I want/need is the location of the exposed edge.
Recently a YouTuber posted a tool they had made. It is basically a cylinder of known diameter with a clearance hole bored down its central axis. Then 1/4 of the round if machined away. When its placed over the exposed edge it can be probed to find center and height of the edge more easily than my previous method. In addition it doesn't matter what angle the work piece is mounted at to find that edge. It should work for most work piece angles of any angle between 90 and 0 where the widest point of the tool is accessible with the probe or edge finder. Of course 90 and 0 would not require the tool.
P.S. Its such a simple elegant solution I am sure the YouTuber wasn't the first one to think of it. Does this tool have a proper name?