Okay have just done a simple 'blob' of water outline curve which runs x and y plane. turned the outline of this blob into a dxf then code. then deleted g64. can now control g64 g61 P and Q parameters from mdi and no suprises, it all works well if set to G64P0Q0. A pattern is starting to emerge.It works well with radius commands but doesn't when a curve is made using lots of straight lines.