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When Brian Choin
fabricated the rear cell for the Carton 100mm f/13 "Mary Dawson"
refractor, I forgot to tell him to increase the inside diameter of
the end that will fit over the main tube to a few hundreds of an
inch over its outside diameter. By not telling him to make the
opening just over 4", it did not fit. It was too exact to allow the
main tube to fit. That meant that I had to remove more material
myself. I could have shipped it back to Brian to make the
adjustment, but I only had to remove less than a millimeter layer
from around the interior circumference of the rear cell. I figure I
could accomplish this using my 8" drill press equipped with a
sanding drum. So taking the initiative, I took on the task. The
method I used, though crude, worked exceptionally well. By going
against the spin of the sanding drum in a steady and uniform manner,
I slowly rotated rear cell to grin away the opening. Periodically
checking for fit to the main tube. It eventually got there. |
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