find mid-point irregular part
Not sure about the mid-point, of surface or part, do you mean the centre of rotation or centre of gravity?
Evaluate - Mass Properties will give you centre of mass.
With surface or solid face you can get the section properties (evaluate tab again), good for bending calcs, second moment of area is given along with the centriod - this only works on planar surfaces.
I have already tried the method which you described. It does find a point on the face, but it is not absolutely in the centre. I have an rregular surface of 5 sides, each side is of a different length. The centre point which is found, is not quite in the centre.
Have you any other ideas? Thanks again for taking the trouble to answer my query.