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I changed the 400 grit sandpaper, and polishing went much faster. Bundle 4 is now less than 0.005" from the target length of 0.787". However, it is hard for me to tell where we bottom out - i.e., which is the smallest feeler gauge that prevents the bundle from touching the sandpaper. There seems to be a gradation of contact between the fibers and the grit, with a thick feeler gauge such as 0.025" allowing slight brushing contact while 0.015" allows the paper to scrape vigorously against the fibers.
I changed the 400 grit sandpaper, and polishing went much faster. Bundle 4 is now less than 0.005" from the target length of 0.787". However, it is hard for me to tell where we bottom out - i.e., which is the smallest feeler gauge that prevents the bundle from touching the sandpaper. There seems to be a gradation of contact between the fibers and the grit, with a thick feeler gauge such as 0.025" allowing slight brushing contact while 0.015" allows the paper to scrape vigorously against the fibers.
4/6: Dr. Jones said it would be good for me to start fusing soon. We won't throw away fibers if fusing goes wrong. We'll just cut them and polish them again.
When the fibers are all tested, I need to come up with charts showing bell curves of all the test results. There should be one peak. However, I would expect two because of the difference between offset fibers.
I asked about telling which end of a sci-fi is highly polished, and Dr. Jones suggested using a microscope. I responded that it would probably be faster to polish both ends of the fibers. He said that would be all right if it doesn't take too long.