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Micah said we should polish with the 400 grit paper until the flare is gone. We may need to move the fibers forward in the collars to continue polishing after finishing with the 400 grit or 1000 grit. They are protruding around 0.016" beyond the collar, and we might want 0.032".
Micah said we should polish with the 400 grit paper until the flare is gone. We may need to move the fibers forward in the collars to continue polishing after finishing with the 400 grit or 1000 grit. They are protruding around 0.016" beyond the collar, and we might want 0.032".
When Micah left I started polishing a bundle of sci-fis with 400 grit. I progressed to the point where the ends of the fibers seem to be all in one plane. For now that is as far as we want to take them because we aren't sure how long they should be.
When Micah left I started polishing a bundle of sci-fis with 400 grit. (These must have been from the "To be milled" bag.) I progressed to the point where the ends of the fibers seem to be all in one plane. For now that is as far as we want to take them because we aren't sure how long they should be.
1/10 I continued polishing the sci-fi bundle with 400 grit, but the cladding was flaring. I wondered if St. Gobain had any documentation about what to do with the ends after cutting fibers. I asked Jim about that, and he gave me a [http://lss.fnal.gov/archive/test-tm/2000/fermilab-tm-2062.pdf research paper from Fermi National Accelerator Laboratory about polishing optical fibers]. However, the paper did not give me ideas for our situation.
1/10 I continued polishing the "Too be milled" sci-fi bundle with 400 grit, but the cladding was flaring. I wondered if St. Gobain had any documentation about what to do with the ends after cutting fibers. I asked Jim about that, and he gave me a [http://lss.fnal.gov/archive/test-tm/2000/fermilab-tm-2062.pdf research paper from Fermi National Accelerator Laboratory about polishing optical fibers]. However, the paper did not give me ideas for our situation.
Jim said I could be pressing the fibers too hard against the sandpaper, spinning the wheel too fast, or not changing the sandpaper enough. Something must be different because the fibers did not flare during the summer when Micah was polishing.
Jim said I could be pressing the fibers too hard against the sandpaper, spinning the wheel too fast, or not changing the sandpaper enough. Something must be different because the fibers did not flare during the summer when Micah was polishing.
Later we asked Dr. Jones about the flaring and he did not think it was a problem the way it was happening. If the the cladding is peeled back for more than 1 mm along the fiber, it is a problem, but that was not our situation. I went ahead with polishing bundle 407 and bottomed it out to 0.016".
Later we asked Dr. Jones about the flaring and he did not think it was a problem the way it was happening. If the the cladding is peeled back for more than 1 mm along the fiber, it is a problem, but that was not our situation. I went ahead with polishing bundle 407 and bottomed it out to 0.016".
1/11: Micah showed me how to remove excess material from the collars and bundling tools that were printed recently. I did that and sanded them in the morning. I polished a bundle of sci-fis with 1000 grit paper.
1/11: Micah showed me how to remove excess material from the collars and bundling tools that were printed recently. I did that and sanded them in the morning. I polished the bundle of "To be milled" sci-fis with 1000 grit paper.
One lesson from today is that I need to use a light touch with fine grits such as 5 micron and below. The fibers should not even squeak against the wheel. If you press them too hard, the fibers will smear and get a little sticky on the ends.
One lesson from today is that I need to use a light touch with fine grits such as 5 micron and below. The fibers should not even squeak against the wheel. If you press them too hard, the fibers will smear and get a little sticky on the ends.
1/12: It may be helpful to remove scratches and smears by moving the bundle to the left or right of center and finish polishing at the center of the wheel.
1/12: It may be helpful to remove scratches and smears by moving the bundle to the left or right of center and finish polishing at the center of the wheel.
When polishing fibers, it is best to twist the plate in the same direction always, no matter which way the wheel is turning. That is how to achieve a flat surface across the end of the bundle. If fiber ends are rounded, they scatter light more, so they should be flat instead.
During polishing, we should avoid letting the wheel push the fibers up. We should put them against the wheel so that whichever way it is turning it is going sideways or down where it touches the fibers. With this practice we can make the platform most effective at stabilizing the fibers. If the wheel is going up where it touches them, it is fighting the stabilizing force of the platform.
1/16: To put the blade on the Dremel, you need to push it on and turn it clockwise. I need to remember to put weights on the fibers and put the foam rubber under the Dremel when cutting.
1/16: To put the blade on the Dremel, you need to push it on and turn it clockwise. I need to remember to put weights on the fibers and put the foam rubber under the Dremel when cutting.