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If I push on the long fiber during heating and cooling, the gripping clamps are more likely to bottom out at some time. The results from my extra pushing are quite variable. Even if I push fairly hard, the fibers are sometimes weak and break at 850 grams, although they may have the kind of wings that used to imply adequate strength. However, pressing too hard creates huge wings that are too thick to cut easily. It is easy to damage the cladding while removing the thick wings.
If I push on the long fiber during heating and cooling, the gripping clamps are more likely to bottom out at some time. The results from my extra pushing are quite variable. Even if I push fairly hard, the fibers are sometimes weak and break at 850 grams, although they may have the kind of wings that used to imply adequate strength. However, pressing too hard creates huge wings that are too thick to cut easily. It is easy to damage the cladding while removing the thick wings.
6/6: I am wondering about the effects of friction between the fibers and the gripping clamps and between the fibers and the ferrules. I think Jim said that there is a little more than enough space for the fibers between the ferrules when they are mated. If that is so, there should be a lot less friction between the fibers and the ferrules than between the fibers and the clamps.
But if for some reason the extra space is not there and the ferrules are putting a tighter grip on the fibers than we thought, the ferrules might be resisting the force of the clamps that should bring the fibers together.
One way to test this idea is to turn off the heating lamp and put a scrap in so that it goes through the clamps and partly through the ferrules, but not all the way to the end. We can do a run and see how much the fiber moves toward the end.