| Please
note that the soft reflected glow from the sanded Sonotube does not
display the crisp edges of the spiral-wound overlapping embossment. This
is because the overlapping line of the spiral-wound paper (raised spiral line
seen on many completed home-built Sonotube Newtonian OTA's) has been ground down
smooth to the level of the rest of the tube using
my random orbital sander loaded with an 80-grit sandpaper disk wheel. Only the
outer edge of the sandpaper disk was carefully used to remove the spiral
overlap embossment.
This
created a smooth surface that when coated with epoxy, primer, and paint will be
much more uniform in texture and appearance. |
|
