No surprise there although for all my grasp of CAD, it might as well be witchcraft! I was wondering how the practicalities of managing the effects of the manufacturing process (specifically rates of cooling) on the very different masses involved. I noted the fabrication vs. casting debate regarding the 'spider' on 6MT 72010. Query: Given the sort of fallout you describe and with the range of 'scopes' now available to raise inspection to levels undreamed of in the not so distant past, I'm surprised to hear casting sand removal is still such a bugbear. What's the old saying about an ounce of prevention? At what stage and how is it currently removed from complex castings?