So I really want to learn how to use a mill, and what better way than making something that's actually useful? Next semester we will be manufacturing an air compressor as a final design project. I'm hoping that I can figure out how to change it into a water pump (materials are NOT an issue here! I don't care about price). With that, I can purchase some more water cooling supplies to custom water cool my computer. At first I was thinking about making a high-quality yoyo, but then a lot of the yoyo gurus were telling me that I'd need to learn how to use my CNC lathe in order to get the precision required (which makes sense). It seems like I'd be able to make all the measurements of a CPU waterblock with normal measurement tools. Do you think I could make a surface flat enough to have good contact with the processor using only a mill, bandsaw, and grinder? I go to a small university for mechanical engineering so we have a good amount of equipment at my disposal. I just don't want to bother the lab techs to spend hours teaching me how to use a CNC for something non-academic. Would a CPU waterblock be a good choice?