Ancient Power Tool Evidence That Scientists Have A Hard Time Explaining

There is evidence of precision machining methods all over the ancient world, as well as more sophisticated, conventional type sawing, lathe and milling practices. Undoubtedly, some of the artifacts that were produced using lathes. There is also evidence of clearly defined lathe tool marks on some "sarcophagi" lids. The Cairo Museum contains enough evidence that will prove that the ancient Egyptians used highly sophisticated manufacturing methods once its properly analyzed. For generations the focus has centered on the nature of the cutting tools used by the ancient Egyptians, what guided these ancient cutting tools? Some even speculate that the builders used lasers to cut the masonry and then levitated the stones into place in the pyramid. Some pieces of granite and diorite discovered in Egypt exhibit marks that are the same as those resulting from cutting hard igneous rock with modern machinery.
Ancient Egyptians performed tasks which would, by today’s standards, be considered impossible without highly developed specialized techniques, such as cutting concave and convex spherical radii without splintering the material.The tools displayed by Egyptologists as instruments for the creation of many of these incredible artifacts are physically incapable of reproducing them. So why do modern mainstream Egyptologists insist that this work was accomplished with a few primitive copper instruments?