I have a print that is calling out the True position of a Hex Nut, on top of the FCF it has the description of the Hex nut instead of a diameter size. Have any had to deal with something like this?
how do you go about measuring it? do you probe the inside where the threads are located? do you probe the outside edges of the hex nut? or do you use some special tool like dustin is talking about?
I get the part completely deburred & as clean as possible. Then with the largest diameter ball possible I probe the threads. I'll use two or three separate auto-circles with as many hits as possible using the appropriate positive or negative tread pitch. I'll then construct those circles into a cylinder & report the position of that cylinder.
I have found that this method accurately reports position but not so much for reporting the thread's major diameter.