I am beating on dead horses? What does this saying mean? If it means I am making dead horses/topics re-alive, then I am glad. Science philosophers in the world in last decade have focused themselves onto only "where they have made mistakes in the past" instead of trying to find new things, instead of walking toward the future. They have started to see what I had seen a decade ago or two.
Detecting problems in other materials such as sheet metals, I,U,T beams, pipes, etc is easy and they can be improved easily by paying manufacturer only a little bit more. Using better or required grade materials is not a problem, does not require knowledge. Only payment a little bit more. You know this and your main complain concerning materials of Chinese products is about their casting quality only. This is a good example as it requires some more knowledge and some quality workmanship. You are an engineer at a construction machinery factory, aren't you? If you are at buying office of your factory, send me an acad drawing of one of your components or two. I will have one sample casted here and will have another sample casted in China. You will see there is no quality difference between them. And, you will like qualities of both of them. Buying offices of factories and also distributors/importers are usually making mistakes. All they do is to try to pay minimum. I pay a little bit more for Chinese products and I get much better quality Chinese items than the items made in the west you call quality item. For your information, gearboxes of KK tillers/cutters/etc are being made in China too. Lets not mention about many components of top tractors of world which are already being manufactured in China. So, if they want, they manufacture much better than anywhere, and still much cheaper than anywhere in the world, don't they? Then, why are some Chinese products low quality? You try to pay as low as possible. Your buying office at the factory is making mistake. Send me your dwg and let me prove.