With the selection of the
main tube made. It is now time to cut it to proper length. The length
was determined based on the specifications from the placement of the
mounted objective cell, and the focuser parameters (please refer to
the ray trace specifications on the
Components and Ray Trace Design Diagram page).
As you can see here in the
photo, I have wrapped a sheet of 8.5" wide card stock (that has an
accurate straight edge) around the circumference of the main tube at
the cut point. This process assures me that the line I will slowly
etch around the tube will be true and perpendicular to the main tube's
length. A sweet trick for near perfect right-angle cuts to tubular
substrates. This process has worked for me on numerous ocassions. |
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